Exam Details
| Subject | electrical engineering | |
| Paper | paper 2 | |
| Exam / Course | ||
| Department | ||
| Organization | Uttarakhand Public Service Commission | |
| Position | assistant engineer | |
| Exam Date | 2013 | |
| City, State | uttarakhand, |
Question Paper
1. A pure inductor has power factor of
1
route 2
0
None of these
2. A series RLC circuit resonate at 200 Hz. If the capacitance is increased to four times, the circuit will be in resonance at
100 Hz
200 Hz
400 Hz
800 Hz
3. The voltage phasor of a circuit is 10 .15° V and the current phasor is 2.-45° A. The active and reactive powers in the circuit are
<img src='./qimages/3399-3.jpg'>
4. In the circuit shown in the figure, if the power consumed by the 5 O resistor is 10 then the power factor of the circuit is
<img src='./qimages/3399-4.jpg'>
5. Resistance between terminals A and B of the given figure is
<img src='./qimages/3399-5.jpg'>
3/5R
1/5R
R
2/5R
6. In the given circuit, Thevenin voltage across the terminal AB is
<img src='./qimages/3399-6.jpg'>
-15V
15V
5V
0V
7. Calculate the value of load resistance RL to which maximum power may be transferred from the source shown in figure
<img src='./qimages/3399-7.jpg'>
8. If the p and T circuits in figure below are equivalent, then R1, R2, R3 respectively are
<img src='./qimages/3399-8.jpg'>
9. Find the value of in the circuit.
<img src='./qimages/3399-9.jpg'>
10. The current in the R 10 W resistance in the circuit below is
<img src='./qimages/3399-10.jpg'>
11. In the circuit below, the current through E2 is
<img src='./qimages/3399-11.jpg'>
9 A discharging
9 A charging
1 A discharging
1 A charging
12. For the circuit of the given figure, the value of current I is
<img src='./qimages/3399-12.jpg'>
13. The electrical energy consumed by an appliance of power rating P watts connected across its rated V for t hours is Pt Pt
P/V .t kWhr
kWhr
Pt kWhr
kWhr 1000 3600
14.
<img src='./qimages/3399-14.jpg'>
Equivalent resistance between A in the figure above is
1.875 O
2.875 O
0.53 O
2.125 O
15. Norton equivalent of the circuit given below is
<img src='./qimages/3399-15.jpg'>
16. In the given circuit, inductances L1 and L2 if 2L2 and Leq is 0.7 are
<img src='./qimages/3399-16.jpg'>
17. Thevenin equivalent of the above circuit will be
<img src='./qimages/3399-17.jpg'>
18. In a six pole motor, 4 mechanical degrees is equal to
4 electrical degrees
2 electrical degrees
8 electrical degrees
12 electrical degrees
19. An ideal synchronous motor has no starting torque because the
Rotor is made up of salient poles.
Relative velocity between the stator and rotor mmfs is zero.
Relative velocity between stator and rotor mmfs is not zero.
Rotor winding is highly inductive.
20. At a slip of maximum possible speed of a 3-phase squirrel cage induction motor is
2880 rpm
3000 rpm
1500 rpm
1440 rpm
21. If the stator winding of a three-phase induction motor is delta connected, the rotor winding
should be delta connected
should be star connected
should not be delta connected
may be delta or star connected
22. Synchronous motors are to be used in situations where
The load is constant.
The load is required to be driven at very high speeds.
The load is to be driven at constant speed.
The starting torque requirement of the load is very high.
23. When excitation of synchronous motor is increased upto normal excitation from under excitation, armature current
increases
decreases
remains constant
None of the above
24. In a synchronous motor, damper winding is provided to
stabilize rotor motion
suppress rotor oscillations
develop necessary starting torque
and both
25. Direction of rotation of three phase induction motor can be reversed by
interchanging connections of any two phases
disconnecting any one phase
and both
None of the above
26. Variation in dc excitation of a synchronous motor causes variation in
Speed of motor
Power factor
Armature current
Both armature current and power factor
27. Reduction in supply voltage by 10% will change the torque of an induction motor by
38%
19%
9.5%
No change
28. The step angle of the stepper motor is 2.5°. If the stepping frequency is 3600 pulses per second, then the shaft speed will be
144 rps
3600 rps
25 rps
2.5 rps
29. A 3-phase, 50 Hz, 500 V induction motor develops 20 hp at slip of 5%. Mechanical losses are 1 hp, and stator loss is 1 kW. The efficiency will be
95.3%
90.5%
91.3%
85.3%
30. The electric motor used in toys is
capacitor start motor
split phase motor
shaded pole motor
None of these
31. AC servo-motor is basically a
Capacitor motor
Two phase motor
Three phase motor
Universal motor
32. Crawling in an induction motor is due to
Space harmonics produced by winding currents.
Time harmonics in supply.
Slip ring rotor.
Insufficient starting torque.
33. A shaded pole induction motor does not have the advantage of
Rugged construction
Low initial as well as maintenance cost
High starting torque
Comparatively small starting current
34. In three phase 400 volt, 50 Hz supply, the phase to neutral voltage is
220 Volt
230 Volt
440 Volt
150 Volt
35. Integration of unit ramp function gives
Unit parabolic function
Unit ramp function
Unit doublet function
None of these
36. In house wiring, Black Green wires indicate
Earth Neutral respectively
Phase Neutral respectively
Phase Earth respectively
Neutral Earth respectively
37. Ferranti effect on long overhead lines is experienced when
the line is highly loaded.
the power factor is unity.
the power factor is leading.
corona effect is dominated.
38. A 10 kVA, 400 V/200 single-phase transformer with 10% impedance, draws a steady short circuit current of
50A
150A
250A
350A
39. Kick fuses are used across relay coils to prevent relay operation during
Heavy external faults
Inrush current of transformer when they are energised
Line to ground faults
Bolted faults
40. For a fuse wire of diameter fusing current is proportional to d1.2 d1.5
<img src='./qimages/3399-40.jpg'>
41. Differential relays are used for the protection of equipments against
Internal faults
Over current
Reverse current
Reverse power
42. A 3-phase circuit breaker is rated at 1250 2000 MVA, 33 kV, 4s. Its making current capacity will be
35kA
89kA
79kA
69kA
43. Main function of the fuse is to
Protect the line
Open the circuit
Protect the appliance
Prevent excessive current
44. Distribution voltage levels in India are
11kV,400V,3 f
33kV,11kV,3 f
220 kV, 11 kV, 3 f
None of the above
45. By burden on the relay, we generally mean
Current rating of relay
Voltage rating of relay
Volt-ampere rating of relay
Watt rating of relay
46. In a static over-current relay, inverse time characteristics are obtained by
A differentiating circuit
An integrating circuit
A transistor amplifier
A transistor switch
47. At atmospheric pressure, the dielectric strength of SF6 is about
2.5 times of air
2.5 times of oil
2.5 times of vacuum
None of the above
48. Mho relay is
current restrained current relay.
voltage restrained directional relay.
current restrained directional relay.
voltage restrained current relay.
49. Main purpose of oil in OCB is to
provide insulation
provide cooling of contacts
quenching arc
None of the above
50. Which of the following circuit breaker is generally used in railway electrification
Air Blast circuit breaker
Minimum Oil circuit breaker
Bulk Oil circuit breaker
SF6 circuit breaker
51. Isolators are used for disconnecting a circuit when
Line is energised
Line is on full load
Line carries no current
Can be operated under any condition
52. The transmission line feeding power on either side of the main transmission line is called
Secondary distribution
Secondary transmission
Primary transmission
Primary distribution
53. What is the approximate value of average resistance of a human body
1k omegha
5k omegha
10k omegha
15k omegha
54. The skin effect of the conductor increases the effective value of
Inductance of the conductor
Resistance of the conductor
Capacitance of the conductor
None of these
55. Which portion of the transmission system is more prone to faults
Alternator
Transformer
Overhead lines
Underground cables
56. The insulation strength of EHV lines is mainly governed by
Switching over voltages
Lightning over voltages
Power frequency over voltages
Dynamic over voltages
57. Pilot relaying schemes are used for the protection of
Bus bars
Transformer
Instrument transformer
Transmission line
58. The restriking voltage is measured in
RMS value
Peak value
Instantaneous value
Average value
59. In an n-bus power system, considering n-nodes network, the size of ybus is
×
×
n × n
2n × 2n
60. Which fault gives rise to symmetrical fault currents
Single line to ground fault
Line to line fault
Double line to ground fault
Three phase fault
61. Typical solar cell efficiency is
Less than
12% to 25%
30% to 40%
More than 50%
62. India receives solar energy in the range of
5-7 kWh/m2 for 300-330 days in a year
50-70 kWh/m2 for 300-330 days in a year
5-7 kWh/m2 for 200-230 days in a year
50-70 kWh/m2 for 200-230 days in a year
63. Biogas comprises mainly of
60% oxygen and 40% carbon dioxide
60% oxygen and 40% methane
60% methane and 40% oxygen
60% methane and rest carbon dioxide
64. Global warming is mainly due to
Emission of heat from engines
Emission of CO2 due to burning of fossil fuels
Use of nuclear energy
Air pollution
65. The possible site for Geothermal energy extraction for the purpose of electricity in India is
Madhya Pradesh
Kerala
Tamil Nadu
Assam
66. Horizontal axis and vertical axis are the types of
Nuclear Reactor
Wind Mills
Bio Gas Reactor
Solar Cell
67. The Fill Factor of a silicon solar cell is approximately
1
0.7
0.5
0
68. Major share of power generated in India is through
Thermal Power Plants
Nuclear Power Plants
Hydro-electric Power Plants
Solar energy
69. Match Lists L-I and L-II below, in respect of India's installed capacity of nonconventional energy, as on date.
L-I L-II
1. Solar Power A. 2800 MW
2. Wind Power B. 3063 MW
3. Bagass Cogeneration C. 1365 MW
4. Biomass Power D. 22,465 MW
1 2 3 4
A B C D
B A C D
D B A C
B D A C
70. When a body reflects all the radiations incident on it, then the body is known as
White body
Grey body
Black body
Transparent body
71. A diesel power station spends 0.25 kg/kWh fuel. If the calorific value is 10,000 kcal/kg then overall efficiency of the power station will be
25%
30%
34.4%
100%
72. Admittance is the reciprocal of
Impedance
Reactance
Susceptance
Inductance
73. An inductor at t with zero initial conditions acts as
short circuit
open circuit
current source
voltage source
74. In the circuit shown, if we connect a source of 2 volt with internal resistance of 1 O at with positive terminal at then the current through R is 1 O
<img src='./qimages/3399-74.jpg'>
2A
1.66A
1A
0.625A
75. Which of the following statements pertains to resistors only
They oppose sudden change in voltage.
They can act as energy storage device.
They can dissipate desired amount of power.
None of the above.
76. What is the maximum number of points of light, fan and socket-outlets that can be connected in one sub-circuit
5
10
20
30
77. Minimum distance of underground cable from the foundation of building should be
100cm
50cm
10cm
5cm
78. Official systemetic, scientific study of energy consumption by the related organisation for cost reduction and energy conservation is
energy policy
energy audit
and both
None of the above
79. The type of wiring that is highly suitable for a temporary shed is
Cleat wiring
Wooden capping and casing wiring
Lead sheathed wiring
Conduit wiring
80. Current i4 in the figure will be
<img src='./qimages/3399-80.jpg'>
81. Find power absorbed/delivered by 120 V source.
<img src='./qimages/3399-81.jpg'>
82. In the circuit, VS is
<img src='./qimages/3399-82.jpg'>
8V
10V
12V
16V
83. The characteristic equation of the series RLC circuit is
<img src='./qimages/3399-83.jpg'>
84. A network has 10 nodes and 17 branches. The number of independent mesh equations required to solve the network is
7
8
10
45
85. Which of the following elements is not bilateral
Resistor
Inductor
Capacitor
Transistor
86. Each branch of Y-connected load has resistance of 10 O. The resistance of each branch of an equivalent .-connected load will be
30 omegha
100 omegha
110 omegha
None of these
87. In applying superposition theorem, to determine branch currents and voltages
all current and voltage sources are shorted.
only current sources are open circuited.
only voltage sources are shorted.
voltage sources are shorted and current sources are open circuited.
88. In the circuit, the maximum power that can be transferred to Load ZL is
<img src='./qimages/3399-88.jpg'>
89. The material used for fuse wire should be of
low resistivity and high melting point
high resistivity and high melting point
high resistivity and low melting point
low resistivity and low melting point
90. It is desired to illuminate a drawing hall with an average illumination of about 250 lux. The area of hall is 30 m × 20 m. The lamps are to be fitted at 5 m height. Find the number and size of incandescent lamps required for an efficiency of 12 lumen/watt. Utilization factor 0.4 and maintenance factor 0.85.
40 and 1000 W
20 and 500 W
60 and 1000 W
None of the above
91. Battery operated scooter for braking uses
plugging
mechanical braking
regenerative braking
rheostatic braking
92. In spot welding, electric supply used is
low voltage high current
high voltage low current
low voltage low current
high voltage high current
93. In the process of refining of metals, the impure metal is made as
Cathode
Anode
Electrolyte
None of the above
94. Minimum clearance above ground of the lowest conductor of an overhead line erected along a street for low and medium voltages as per "Indian Electricity Rules" is
4.5 metres
6.1 metres
6.5 metres
5.5 metres
95. Synchronous capacitor is
An ordinary static capacitor bank.
An over excited synchronous motor driving mechanical load.
An over excited motor running without mechanical load.
None of the above
96. In terms of cost, overhead transmission line is better than underground transmission line in the field of
Insulation
Right of way
Visibility
None of these
97. Materials used in plate earthing are
Wood coal
Salt, earthing plate
and both
None of the above
98. The rating of fuse wire is always expressed in
volts
amperes
ampere-volt
ampere-hours
99. An automatic power factor controller cannot achieve
Voltage control
kVAR control
kW control
pf control
100. A single phase energy meter has a constant of 1200 revolution/kWh. When a load of 200 W is connected, the disc rotates at 4.2 revolutions per min. If the load is on for 10 hours, the meter records an excess of
0.1 kWh
0.2 kWh
1.0 kWh
2.0 kWh
101. Aluminium conductor cables can be joined by
Gas welding
Soldering
Compression
Thermit welding
102. From the point of view of safety, the resistance of earthing electrode should be
Low
High
Medium
The value of resistance of earth does not affect the safety
103. The insulating fluids that are commonly used in circuit breakers is/are
SF6
Air at atmospheric pressure
Compressed air
All of the above
104. Which of the following test is carried out to ensure the sufficient strength of insulation between two or more conductors to avoid leakage between them
Testing of insulation resistance between wiring and earth
Testing of insulation resistance between conductors
Testing of polarity of single phase switch
Testing of earth continuity path
105. An isolated sphere has a capacitance of 50 pf. If its potential is raised to 104 volts, radius 1 and charge will be respectively. Given that 1/4piee0= 9 × 109 m.
54 cm, 0.5 µC
4.5 cm, 5.0 µC
45 cm, 0.5 µC
5.4 cm, 5.0 µC
106. Which distribution system is more reliable
Ring main system
Tree system
Radial system
All are equally reliable.
107. HV transmission lines use
Pin type insulators
Suspension insulators
Both and
None of the above
108. For proper earthing, what should be the maximum value of earth resistance while carrying out the testing of earth continuity path
1 omegha
2 omegha
5 omegha
10 omegha
109. The advantage of using pulverized fuel include
Higher boiler efficiency
Easy and complete combustion
Low air requirement
All of the above
110. 1 Ton (unit of air conditioning load) in terms of kW is
3.5 kW
4.7 kW
12 kW
10.5 kW
111. In steam locomotive, electric power is provided through
Battery system
Diesel engine generator
Overhead wire
Small turbo generator
112. Which of the following methods of heating is not dependent on the frequency of supply
Induction heating
Dielectric heating
Electric Resistance heating
All of the above
113. A single-phase AC arc welding transformer supplies approximately
100 volts at 0.35 power factor
60 volts at 0.35 power factor
220 volts at 0.8 power factor
100 volts at 0.6 power factor
114. Long distance railways use for their electric traction
200 V dc
25 kV single phase ac
25 kV two phase ac
25 kV three phase ac
115. Which type of motor is used for elevators
Synchronous motor
Inductor motor
Split phase motor
All of the above
116. Minimum wind speed required for generating electricity in a wind mill is
15 m/hour
1 km/hour
15 km/hour
None of the above
117. The rotor of a stepper motor has no
Winding
Commutator
Brushes
All of the above
118. The colour having shortest wavelength in the following is
Yellow
Blue
Orange
Green
119. A synchronous motor is essentially a motor with
Constant speed
Leading power factor
Unity power factor
Lagging power factor
120. At low values of slip, the torque of an induction motor is
directly proportional to the square of the slip.
inversely proportional to the square of the slip.
directly proportional to the slip.
inversely proportional to the slip.
121. An infinite bus-bar has
constant voltage
constant frequency
infinite voltage
both and
122. If the supply frequency of a 3-phase induction motor is then frequency of rotor emf at motor slip will be
sf
s)f
f/s
None of these
123. If a four pole synchronous generator driven at 1500 rpm feeds a 6-pole induction motor, which is loaded to run at a slip of then speed of the motor will be
1000 rpm
950 rpm
1500 rpm
1450 rpm
124. Which of the following vapour/gas will give yellow colour
Helium
Mercury
Sodium
Magnesium
125. If the distance between the light source and the surface is reduced to half, the illumination on the surface will
reduce to half of the original.
reduce to one fourth of the original.
increase to double of the original.
increase to four times of the original.
126. 80% Ni, 20% Cr is called as
Constantan
Nichrome
Kanthal
None of these
127. Electric arc welding process produces temperature upto
1000 °C
1500 °C
3500 °C
5550 °C
128. During the resistance welding heat produced at the joint is proportional to
I2R
kVA
Current
Voltage
129. Which of the following motors is used in household refrigerators
AC series motor
DC shunt motor
Reluctance motor
Single phase induction motor
130. The PLC was invented by
Bill Gates
Dick Morley
Bill Landis
Tod Cunningham
131. Match the Lists L-I and L-II.
L-I L-II
1. Bolometer A. Flow
2. H-Bridge B. Displacement
3.LVDT C. Radiation
4. Anemometer D. DC Motor
1 2 3 4
C D B A
D C A B
A C B D
D C B A
132. Which meter is suitable for the measurement of 10 mV at 50 MHz
Moving iron voltmeter
CRO
Electrostatic voltmeter
VTVM
133. Programmable Logical controllers are the devices that were invented basically to replace
Switches
Circuit Breakers
Relays
None of the above
134. Load cell essentially is a
Thermistor
Strain gauge
Photo-voltaic cell
None of these
135. Stranded wires are mainly used to
reduce skin effect
reduce metal fatigue
reduce proximity effect
both and
136. The method suitable for heating of a conducting medium is
Induction heating
Indirect arc heating
Eddy current heating
Resistance heating
137. A power plant has to supply loads as follows
12pmto5am=500kW; 2pmto5pm=2500kW
5amto10am=800kW; 5pmto8pm=2000kW 10 am to 12 noon 2000 kW; 8 pm to
10 pm 1500 kW
12noonto2pm=1000kW; 10pmto12pm=1000kW
Total units during 24 hours and load factor will be respectively
51.66 units, 31%
31k units, 51.66%
31k units, 33%
None of the above
138. A large size synchronous generator is protected against overloads by
over current relay
mho relay
temperature sensitive relay
Buchholz relay
139. Earth resistance comprises of
A. Resistance of soil away from electrode.
B. Contact resistance between electrode and soil.
C. Resistance of metal electrode
A only
A and B only
A and C only
B and C together
140. When cathode is positive with respect to anode in an SCR, the number of blocked p-n junctions is
1
2
3
4
141. If a forward voltage (less than forward breakover voltage) is suddenly applied across anode and cathode of a thyristor, it may result into
Damage to the thyristor
Premature triggering of the thyristor because of high dV/dt
Reduced holding current of the thyristor
All of the above
142. Match the List-I and List-II below
List-I List-II A. GTO B.
<img src='./qimages/3399-142.jpg'>
1 2 3 4
A C B E
A B C D
C E B A
C E D A
143. The average gate power dissipation for an SCR is 0.5 W. Gate voltage variation is 2 V to 10 V. Which of the following is true
V =2V,I=0.25A;
V =2V,Ig=0.05A;
Vg =10V,I=0.05A
Vg =10V,I=0.25A gg gg
Vg=2V,Ig=10A;
Vg 10 Ig 2 A
None of the above
144. In a thyristor d.c. chopper, which type of commutation results in best performance
Voltage commutation
Current commutation
Load commutation
Supply commutation
145. For a symmetrical square wave of 800 V peak to peak and for ideal diode, the voltmeter in the given figure will read
<img src='./qimages/3399-145.jpg'>
146. The power supply whose output voltage varies with variation in input voltage or output load current is known as
Regulated Power Supply
Unregulated Power Supply
Uninterruptible Power Supply
Switched Mode Power Supply
147. For an SCR, dV/dt protection is achieved by the use of
RL in series with SCR
L in series with SCR
RC in series with SCR
RC across SCR
148. SMPS are superior to linear power supplies in respect of
size and efficiency
efficiency and regulation
regulation and noise
noise and cost
149. A single phase, half-wave, controlled rectifier has 400 sin (314 as the input voltage and R as the load. For a firing angle of 60° for the SCR, the average output voltage is
240/p
400/p
300/p
200/p
150. Which of the following modulation techniques is mostly used in inverters
Pulse width modulation
Square wave output modulation
Both and
Neither nor
151. An IGBT has three terminals called
Collector, Emitter and Base
Drain, Source and Base
Drain, Source and Gate
Collector, Emitter and Gate
152. A UPS commonly has following parts rectifier inverter static switch Which of the following is true
only
only and
and
only and
153.
<img src='./qimages/3399-153.jpg'>
154. When the SCR conducts, the forward voltage drop will
0.7 V at all load current
2 to 2.5 V at all load current
increases slightly with load current
remains constant with load current
155. A separately excited dc motor is required to be controlled, from a 3-phase supply, for its operation in the first quadrant only. The most preferred converter would be
3-phase fully controlled converter
3-phase fully controlled converter with free wheel diode
3-phase dual converter
3-phase half wave converter
156. For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have
short rise time with pulse width 3 µsec
long rise time with pulse width 6 µsec
short rise time with pulse width 6 µsec
None of the above
157. Cyclo converter drives are generally employed in
Traction
Milling
Generating low frequencies
Generating pulses
158. In a dual converter, the circulating current
allows smooth reversal of load current but increases the response time.
allows smooth reversal of load current with improved speed of response.
does not allow smooth reversal of load current but reduces response time.
flows only if there is no interconnecting conductor.
159. A cyclo converter is a
naturally commutated device
forced commutated device
can be commutated in both manner
None of the above
160. The separately excited motor in the figure below has a rated armature current of 20 A and a rated armature voltage of 150 V. An ideal chopper switching at 5 kHz is used to control the armature voltage. If La= 0.1 mH, Ra= 1omegha, neglecting armature reaction, the duty ratio of the chopper to obtain 50% of the rated torque at the rated speed and the rated field current is
<img src='./qimages/3399-160.jpg'>
161. An open-loop system is better than a closed-loop system in terms of
Accuracy
Stability
Noise reduction
Sensitivity
162. A CRO cannot be used for direct measurement of
Voltage
Current
Frequency
Power
163. The cycle time of a PLC is the time it takes to
read all the input signals.
read all the input signals, run the program and update outputs.
read an input signal.
check all the input signals against the program.
164. The thermocouple pair that gives the maximum sensitivity around 273 °k is
Platinum Constantan
Nichrome Constantan
Nickel Constantan
Copper Nickel
165. An inverse transducer converts
electrical energy to any other form of energy
electrical energy to light energy
mechanical displacement into electrical signal
electrical energy to mechanical form
166. Optical Pyrometer is used to measure
Light Intensity
Low Temperature
High Temperature
Light Intensity High Temperature
167. Horizontal deflection plates of CRO are placed generally
Horizontal
Vertical
Diagonal
or
168. A controller essentially is a/an
Amplifier
Sensor
Comparator
Clipper
169. Programming Languages for PLC is/are
Ladder Diagram
Function Block Diagram
Structured Text
All of the above
170. To measure insulation resistance of equipments of voltage rating upto 440 V the megger generator must generate
220 V
440 V
500 V
None of these
171. Lissajous pattern obtained on a CRO screen is a circle. Frequency of two signals are
Equal
Unequal
Zero
Infinity
172. Indicating instruments should be
undamped
critically damped
over damped
under damped
173. A megger is to measure insulation resistance of a cable. The cable should be connected to
Battery
DC supply
AC supply
No supply
174. A strain gauge is a passive transducer and is employed for converting
Pressure into change in resistance
Force into displacement
Mechanical displacement into a change of resistance
None of the above
175. A megger is basically a/an
Moving iron type instrument
Moving coil type instrument
Hot wire instrument
Electrolytic instrument
176. The dynamic characteristics of capacitive transducer are similar to those of
Low-pass filter
High-pass filter
Notch filter
Band-stop filter
177. The insulation resistance test is performed on power lines with
ohm meter
earth tester
megger
Any of these
178. Piezo meter is used to measure
Very high pressure
Very low pressure
Displacement
None of these
179. Which of the following devices is used to measure flow in an open channel
Venturimeter
Rota meter
Orifice
Pitot tube
180. The ladder diagram for the circuit shown below is
<img src='./qimages/3399-180.jpg'>
1
route 2
0
None of these
2. A series RLC circuit resonate at 200 Hz. If the capacitance is increased to four times, the circuit will be in resonance at
100 Hz
200 Hz
400 Hz
800 Hz
3. The voltage phasor of a circuit is 10 .15° V and the current phasor is 2.-45° A. The active and reactive powers in the circuit are
<img src='./qimages/3399-3.jpg'>
4. In the circuit shown in the figure, if the power consumed by the 5 O resistor is 10 then the power factor of the circuit is
<img src='./qimages/3399-4.jpg'>
5. Resistance between terminals A and B of the given figure is
<img src='./qimages/3399-5.jpg'>
3/5R
1/5R
R
2/5R
6. In the given circuit, Thevenin voltage across the terminal AB is
<img src='./qimages/3399-6.jpg'>
-15V
15V
5V
0V
7. Calculate the value of load resistance RL to which maximum power may be transferred from the source shown in figure
<img src='./qimages/3399-7.jpg'>
8. If the p and T circuits in figure below are equivalent, then R1, R2, R3 respectively are
<img src='./qimages/3399-8.jpg'>
9. Find the value of in the circuit.
<img src='./qimages/3399-9.jpg'>
10. The current in the R 10 W resistance in the circuit below is
<img src='./qimages/3399-10.jpg'>
11. In the circuit below, the current through E2 is
<img src='./qimages/3399-11.jpg'>
9 A discharging
9 A charging
1 A discharging
1 A charging
12. For the circuit of the given figure, the value of current I is
<img src='./qimages/3399-12.jpg'>
13. The electrical energy consumed by an appliance of power rating P watts connected across its rated V for t hours is Pt Pt
P/V .t kWhr
kWhr
Pt kWhr
kWhr 1000 3600
14.
<img src='./qimages/3399-14.jpg'>
Equivalent resistance between A in the figure above is
1.875 O
2.875 O
0.53 O
2.125 O
15. Norton equivalent of the circuit given below is
<img src='./qimages/3399-15.jpg'>
16. In the given circuit, inductances L1 and L2 if 2L2 and Leq is 0.7 are
<img src='./qimages/3399-16.jpg'>
17. Thevenin equivalent of the above circuit will be
<img src='./qimages/3399-17.jpg'>
18. In a six pole motor, 4 mechanical degrees is equal to
4 electrical degrees
2 electrical degrees
8 electrical degrees
12 electrical degrees
19. An ideal synchronous motor has no starting torque because the
Rotor is made up of salient poles.
Relative velocity between the stator and rotor mmfs is zero.
Relative velocity between stator and rotor mmfs is not zero.
Rotor winding is highly inductive.
20. At a slip of maximum possible speed of a 3-phase squirrel cage induction motor is
2880 rpm
3000 rpm
1500 rpm
1440 rpm
21. If the stator winding of a three-phase induction motor is delta connected, the rotor winding
should be delta connected
should be star connected
should not be delta connected
may be delta or star connected
22. Synchronous motors are to be used in situations where
The load is constant.
The load is required to be driven at very high speeds.
The load is to be driven at constant speed.
The starting torque requirement of the load is very high.
23. When excitation of synchronous motor is increased upto normal excitation from under excitation, armature current
increases
decreases
remains constant
None of the above
24. In a synchronous motor, damper winding is provided to
stabilize rotor motion
suppress rotor oscillations
develop necessary starting torque
and both
25. Direction of rotation of three phase induction motor can be reversed by
interchanging connections of any two phases
disconnecting any one phase
and both
None of the above
26. Variation in dc excitation of a synchronous motor causes variation in
Speed of motor
Power factor
Armature current
Both armature current and power factor
27. Reduction in supply voltage by 10% will change the torque of an induction motor by
38%
19%
9.5%
No change
28. The step angle of the stepper motor is 2.5°. If the stepping frequency is 3600 pulses per second, then the shaft speed will be
144 rps
3600 rps
25 rps
2.5 rps
29. A 3-phase, 50 Hz, 500 V induction motor develops 20 hp at slip of 5%. Mechanical losses are 1 hp, and stator loss is 1 kW. The efficiency will be
95.3%
90.5%
91.3%
85.3%
30. The electric motor used in toys is
capacitor start motor
split phase motor
shaded pole motor
None of these
31. AC servo-motor is basically a
Capacitor motor
Two phase motor
Three phase motor
Universal motor
32. Crawling in an induction motor is due to
Space harmonics produced by winding currents.
Time harmonics in supply.
Slip ring rotor.
Insufficient starting torque.
33. A shaded pole induction motor does not have the advantage of
Rugged construction
Low initial as well as maintenance cost
High starting torque
Comparatively small starting current
34. In three phase 400 volt, 50 Hz supply, the phase to neutral voltage is
220 Volt
230 Volt
440 Volt
150 Volt
35. Integration of unit ramp function gives
Unit parabolic function
Unit ramp function
Unit doublet function
None of these
36. In house wiring, Black Green wires indicate
Earth Neutral respectively
Phase Neutral respectively
Phase Earth respectively
Neutral Earth respectively
37. Ferranti effect on long overhead lines is experienced when
the line is highly loaded.
the power factor is unity.
the power factor is leading.
corona effect is dominated.
38. A 10 kVA, 400 V/200 single-phase transformer with 10% impedance, draws a steady short circuit current of
50A
150A
250A
350A
39. Kick fuses are used across relay coils to prevent relay operation during
Heavy external faults
Inrush current of transformer when they are energised
Line to ground faults
Bolted faults
40. For a fuse wire of diameter fusing current is proportional to d1.2 d1.5
<img src='./qimages/3399-40.jpg'>
41. Differential relays are used for the protection of equipments against
Internal faults
Over current
Reverse current
Reverse power
42. A 3-phase circuit breaker is rated at 1250 2000 MVA, 33 kV, 4s. Its making current capacity will be
35kA
89kA
79kA
69kA
43. Main function of the fuse is to
Protect the line
Open the circuit
Protect the appliance
Prevent excessive current
44. Distribution voltage levels in India are
11kV,400V,3 f
33kV,11kV,3 f
220 kV, 11 kV, 3 f
None of the above
45. By burden on the relay, we generally mean
Current rating of relay
Voltage rating of relay
Volt-ampere rating of relay
Watt rating of relay
46. In a static over-current relay, inverse time characteristics are obtained by
A differentiating circuit
An integrating circuit
A transistor amplifier
A transistor switch
47. At atmospheric pressure, the dielectric strength of SF6 is about
2.5 times of air
2.5 times of oil
2.5 times of vacuum
None of the above
48. Mho relay is
current restrained current relay.
voltage restrained directional relay.
current restrained directional relay.
voltage restrained current relay.
49. Main purpose of oil in OCB is to
provide insulation
provide cooling of contacts
quenching arc
None of the above
50. Which of the following circuit breaker is generally used in railway electrification
Air Blast circuit breaker
Minimum Oil circuit breaker
Bulk Oil circuit breaker
SF6 circuit breaker
51. Isolators are used for disconnecting a circuit when
Line is energised
Line is on full load
Line carries no current
Can be operated under any condition
52. The transmission line feeding power on either side of the main transmission line is called
Secondary distribution
Secondary transmission
Primary transmission
Primary distribution
53. What is the approximate value of average resistance of a human body
1k omegha
5k omegha
10k omegha
15k omegha
54. The skin effect of the conductor increases the effective value of
Inductance of the conductor
Resistance of the conductor
Capacitance of the conductor
None of these
55. Which portion of the transmission system is more prone to faults
Alternator
Transformer
Overhead lines
Underground cables
56. The insulation strength of EHV lines is mainly governed by
Switching over voltages
Lightning over voltages
Power frequency over voltages
Dynamic over voltages
57. Pilot relaying schemes are used for the protection of
Bus bars
Transformer
Instrument transformer
Transmission line
58. The restriking voltage is measured in
RMS value
Peak value
Instantaneous value
Average value
59. In an n-bus power system, considering n-nodes network, the size of ybus is
×
×
n × n
2n × 2n
60. Which fault gives rise to symmetrical fault currents
Single line to ground fault
Line to line fault
Double line to ground fault
Three phase fault
61. Typical solar cell efficiency is
Less than
12% to 25%
30% to 40%
More than 50%
62. India receives solar energy in the range of
5-7 kWh/m2 for 300-330 days in a year
50-70 kWh/m2 for 300-330 days in a year
5-7 kWh/m2 for 200-230 days in a year
50-70 kWh/m2 for 200-230 days in a year
63. Biogas comprises mainly of
60% oxygen and 40% carbon dioxide
60% oxygen and 40% methane
60% methane and 40% oxygen
60% methane and rest carbon dioxide
64. Global warming is mainly due to
Emission of heat from engines
Emission of CO2 due to burning of fossil fuels
Use of nuclear energy
Air pollution
65. The possible site for Geothermal energy extraction for the purpose of electricity in India is
Madhya Pradesh
Kerala
Tamil Nadu
Assam
66. Horizontal axis and vertical axis are the types of
Nuclear Reactor
Wind Mills
Bio Gas Reactor
Solar Cell
67. The Fill Factor of a silicon solar cell is approximately
1
0.7
0.5
0
68. Major share of power generated in India is through
Thermal Power Plants
Nuclear Power Plants
Hydro-electric Power Plants
Solar energy
69. Match Lists L-I and L-II below, in respect of India's installed capacity of nonconventional energy, as on date.
L-I L-II
1. Solar Power A. 2800 MW
2. Wind Power B. 3063 MW
3. Bagass Cogeneration C. 1365 MW
4. Biomass Power D. 22,465 MW
1 2 3 4
A B C D
B A C D
D B A C
B D A C
70. When a body reflects all the radiations incident on it, then the body is known as
White body
Grey body
Black body
Transparent body
71. A diesel power station spends 0.25 kg/kWh fuel. If the calorific value is 10,000 kcal/kg then overall efficiency of the power station will be
25%
30%
34.4%
100%
72. Admittance is the reciprocal of
Impedance
Reactance
Susceptance
Inductance
73. An inductor at t with zero initial conditions acts as
short circuit
open circuit
current source
voltage source
74. In the circuit shown, if we connect a source of 2 volt with internal resistance of 1 O at with positive terminal at then the current through R is 1 O
<img src='./qimages/3399-74.jpg'>
2A
1.66A
1A
0.625A
75. Which of the following statements pertains to resistors only
They oppose sudden change in voltage.
They can act as energy storage device.
They can dissipate desired amount of power.
None of the above.
76. What is the maximum number of points of light, fan and socket-outlets that can be connected in one sub-circuit
5
10
20
30
77. Minimum distance of underground cable from the foundation of building should be
100cm
50cm
10cm
5cm
78. Official systemetic, scientific study of energy consumption by the related organisation for cost reduction and energy conservation is
energy policy
energy audit
and both
None of the above
79. The type of wiring that is highly suitable for a temporary shed is
Cleat wiring
Wooden capping and casing wiring
Lead sheathed wiring
Conduit wiring
80. Current i4 in the figure will be
<img src='./qimages/3399-80.jpg'>
81. Find power absorbed/delivered by 120 V source.
<img src='./qimages/3399-81.jpg'>
82. In the circuit, VS is
<img src='./qimages/3399-82.jpg'>
8V
10V
12V
16V
83. The characteristic equation of the series RLC circuit is
<img src='./qimages/3399-83.jpg'>
84. A network has 10 nodes and 17 branches. The number of independent mesh equations required to solve the network is
7
8
10
45
85. Which of the following elements is not bilateral
Resistor
Inductor
Capacitor
Transistor
86. Each branch of Y-connected load has resistance of 10 O. The resistance of each branch of an equivalent .-connected load will be
30 omegha
100 omegha
110 omegha
None of these
87. In applying superposition theorem, to determine branch currents and voltages
all current and voltage sources are shorted.
only current sources are open circuited.
only voltage sources are shorted.
voltage sources are shorted and current sources are open circuited.
88. In the circuit, the maximum power that can be transferred to Load ZL is
<img src='./qimages/3399-88.jpg'>
89. The material used for fuse wire should be of
low resistivity and high melting point
high resistivity and high melting point
high resistivity and low melting point
low resistivity and low melting point
90. It is desired to illuminate a drawing hall with an average illumination of about 250 lux. The area of hall is 30 m × 20 m. The lamps are to be fitted at 5 m height. Find the number and size of incandescent lamps required for an efficiency of 12 lumen/watt. Utilization factor 0.4 and maintenance factor 0.85.
40 and 1000 W
20 and 500 W
60 and 1000 W
None of the above
91. Battery operated scooter for braking uses
plugging
mechanical braking
regenerative braking
rheostatic braking
92. In spot welding, electric supply used is
low voltage high current
high voltage low current
low voltage low current
high voltage high current
93. In the process of refining of metals, the impure metal is made as
Cathode
Anode
Electrolyte
None of the above
94. Minimum clearance above ground of the lowest conductor of an overhead line erected along a street for low and medium voltages as per "Indian Electricity Rules" is
4.5 metres
6.1 metres
6.5 metres
5.5 metres
95. Synchronous capacitor is
An ordinary static capacitor bank.
An over excited synchronous motor driving mechanical load.
An over excited motor running without mechanical load.
None of the above
96. In terms of cost, overhead transmission line is better than underground transmission line in the field of
Insulation
Right of way
Visibility
None of these
97. Materials used in plate earthing are
Wood coal
Salt, earthing plate
and both
None of the above
98. The rating of fuse wire is always expressed in
volts
amperes
ampere-volt
ampere-hours
99. An automatic power factor controller cannot achieve
Voltage control
kVAR control
kW control
pf control
100. A single phase energy meter has a constant of 1200 revolution/kWh. When a load of 200 W is connected, the disc rotates at 4.2 revolutions per min. If the load is on for 10 hours, the meter records an excess of
0.1 kWh
0.2 kWh
1.0 kWh
2.0 kWh
101. Aluminium conductor cables can be joined by
Gas welding
Soldering
Compression
Thermit welding
102. From the point of view of safety, the resistance of earthing electrode should be
Low
High
Medium
The value of resistance of earth does not affect the safety
103. The insulating fluids that are commonly used in circuit breakers is/are
SF6
Air at atmospheric pressure
Compressed air
All of the above
104. Which of the following test is carried out to ensure the sufficient strength of insulation between two or more conductors to avoid leakage between them
Testing of insulation resistance between wiring and earth
Testing of insulation resistance between conductors
Testing of polarity of single phase switch
Testing of earth continuity path
105. An isolated sphere has a capacitance of 50 pf. If its potential is raised to 104 volts, radius 1 and charge will be respectively. Given that 1/4piee0= 9 × 109 m.
54 cm, 0.5 µC
4.5 cm, 5.0 µC
45 cm, 0.5 µC
5.4 cm, 5.0 µC
106. Which distribution system is more reliable
Ring main system
Tree system
Radial system
All are equally reliable.
107. HV transmission lines use
Pin type insulators
Suspension insulators
Both and
None of the above
108. For proper earthing, what should be the maximum value of earth resistance while carrying out the testing of earth continuity path
1 omegha
2 omegha
5 omegha
10 omegha
109. The advantage of using pulverized fuel include
Higher boiler efficiency
Easy and complete combustion
Low air requirement
All of the above
110. 1 Ton (unit of air conditioning load) in terms of kW is
3.5 kW
4.7 kW
12 kW
10.5 kW
111. In steam locomotive, electric power is provided through
Battery system
Diesel engine generator
Overhead wire
Small turbo generator
112. Which of the following methods of heating is not dependent on the frequency of supply
Induction heating
Dielectric heating
Electric Resistance heating
All of the above
113. A single-phase AC arc welding transformer supplies approximately
100 volts at 0.35 power factor
60 volts at 0.35 power factor
220 volts at 0.8 power factor
100 volts at 0.6 power factor
114. Long distance railways use for their electric traction
200 V dc
25 kV single phase ac
25 kV two phase ac
25 kV three phase ac
115. Which type of motor is used for elevators
Synchronous motor
Inductor motor
Split phase motor
All of the above
116. Minimum wind speed required for generating electricity in a wind mill is
15 m/hour
1 km/hour
15 km/hour
None of the above
117. The rotor of a stepper motor has no
Winding
Commutator
Brushes
All of the above
118. The colour having shortest wavelength in the following is
Yellow
Blue
Orange
Green
119. A synchronous motor is essentially a motor with
Constant speed
Leading power factor
Unity power factor
Lagging power factor
120. At low values of slip, the torque of an induction motor is
directly proportional to the square of the slip.
inversely proportional to the square of the slip.
directly proportional to the slip.
inversely proportional to the slip.
121. An infinite bus-bar has
constant voltage
constant frequency
infinite voltage
both and
122. If the supply frequency of a 3-phase induction motor is then frequency of rotor emf at motor slip will be
sf
s)f
f/s
None of these
123. If a four pole synchronous generator driven at 1500 rpm feeds a 6-pole induction motor, which is loaded to run at a slip of then speed of the motor will be
1000 rpm
950 rpm
1500 rpm
1450 rpm
124. Which of the following vapour/gas will give yellow colour
Helium
Mercury
Sodium
Magnesium
125. If the distance between the light source and the surface is reduced to half, the illumination on the surface will
reduce to half of the original.
reduce to one fourth of the original.
increase to double of the original.
increase to four times of the original.
126. 80% Ni, 20% Cr is called as
Constantan
Nichrome
Kanthal
None of these
127. Electric arc welding process produces temperature upto
1000 °C
1500 °C
3500 °C
5550 °C
128. During the resistance welding heat produced at the joint is proportional to
I2R
kVA
Current
Voltage
129. Which of the following motors is used in household refrigerators
AC series motor
DC shunt motor
Reluctance motor
Single phase induction motor
130. The PLC was invented by
Bill Gates
Dick Morley
Bill Landis
Tod Cunningham
131. Match the Lists L-I and L-II.
L-I L-II
1. Bolometer A. Flow
2. H-Bridge B. Displacement
3.LVDT C. Radiation
4. Anemometer D. DC Motor
1 2 3 4
C D B A
D C A B
A C B D
D C B A
132. Which meter is suitable for the measurement of 10 mV at 50 MHz
Moving iron voltmeter
CRO
Electrostatic voltmeter
VTVM
133. Programmable Logical controllers are the devices that were invented basically to replace
Switches
Circuit Breakers
Relays
None of the above
134. Load cell essentially is a
Thermistor
Strain gauge
Photo-voltaic cell
None of these
135. Stranded wires are mainly used to
reduce skin effect
reduce metal fatigue
reduce proximity effect
both and
136. The method suitable for heating of a conducting medium is
Induction heating
Indirect arc heating
Eddy current heating
Resistance heating
137. A power plant has to supply loads as follows
12pmto5am=500kW; 2pmto5pm=2500kW
5amto10am=800kW; 5pmto8pm=2000kW 10 am to 12 noon 2000 kW; 8 pm to
10 pm 1500 kW
12noonto2pm=1000kW; 10pmto12pm=1000kW
Total units during 24 hours and load factor will be respectively
51.66 units, 31%
31k units, 51.66%
31k units, 33%
None of the above
138. A large size synchronous generator is protected against overloads by
over current relay
mho relay
temperature sensitive relay
Buchholz relay
139. Earth resistance comprises of
A. Resistance of soil away from electrode.
B. Contact resistance between electrode and soil.
C. Resistance of metal electrode
A only
A and B only
A and C only
B and C together
140. When cathode is positive with respect to anode in an SCR, the number of blocked p-n junctions is
1
2
3
4
141. If a forward voltage (less than forward breakover voltage) is suddenly applied across anode and cathode of a thyristor, it may result into
Damage to the thyristor
Premature triggering of the thyristor because of high dV/dt
Reduced holding current of the thyristor
All of the above
142. Match the List-I and List-II below
List-I List-II A. GTO B.
<img src='./qimages/3399-142.jpg'>
1 2 3 4
A C B E
A B C D
C E B A
C E D A
143. The average gate power dissipation for an SCR is 0.5 W. Gate voltage variation is 2 V to 10 V. Which of the following is true
V =2V,I=0.25A;
V =2V,Ig=0.05A;
Vg =10V,I=0.05A
Vg =10V,I=0.25A gg gg
Vg=2V,Ig=10A;
Vg 10 Ig 2 A
None of the above
144. In a thyristor d.c. chopper, which type of commutation results in best performance
Voltage commutation
Current commutation
Load commutation
Supply commutation
145. For a symmetrical square wave of 800 V peak to peak and for ideal diode, the voltmeter in the given figure will read
<img src='./qimages/3399-145.jpg'>
146. The power supply whose output voltage varies with variation in input voltage or output load current is known as
Regulated Power Supply
Unregulated Power Supply
Uninterruptible Power Supply
Switched Mode Power Supply
147. For an SCR, dV/dt protection is achieved by the use of
RL in series with SCR
L in series with SCR
RC in series with SCR
RC across SCR
148. SMPS are superior to linear power supplies in respect of
size and efficiency
efficiency and regulation
regulation and noise
noise and cost
149. A single phase, half-wave, controlled rectifier has 400 sin (314 as the input voltage and R as the load. For a firing angle of 60° for the SCR, the average output voltage is
240/p
400/p
300/p
200/p
150. Which of the following modulation techniques is mostly used in inverters
Pulse width modulation
Square wave output modulation
Both and
Neither nor
151. An IGBT has three terminals called
Collector, Emitter and Base
Drain, Source and Base
Drain, Source and Gate
Collector, Emitter and Gate
152. A UPS commonly has following parts rectifier inverter static switch Which of the following is true
only
only and
and
only and
153.
<img src='./qimages/3399-153.jpg'>
154. When the SCR conducts, the forward voltage drop will
0.7 V at all load current
2 to 2.5 V at all load current
increases slightly with load current
remains constant with load current
155. A separately excited dc motor is required to be controlled, from a 3-phase supply, for its operation in the first quadrant only. The most preferred converter would be
3-phase fully controlled converter
3-phase fully controlled converter with free wheel diode
3-phase dual converter
3-phase half wave converter
156. For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have
short rise time with pulse width 3 µsec
long rise time with pulse width 6 µsec
short rise time with pulse width 6 µsec
None of the above
157. Cyclo converter drives are generally employed in
Traction
Milling
Generating low frequencies
Generating pulses
158. In a dual converter, the circulating current
allows smooth reversal of load current but increases the response time.
allows smooth reversal of load current with improved speed of response.
does not allow smooth reversal of load current but reduces response time.
flows only if there is no interconnecting conductor.
159. A cyclo converter is a
naturally commutated device
forced commutated device
can be commutated in both manner
None of the above
160. The separately excited motor in the figure below has a rated armature current of 20 A and a rated armature voltage of 150 V. An ideal chopper switching at 5 kHz is used to control the armature voltage. If La= 0.1 mH, Ra= 1omegha, neglecting armature reaction, the duty ratio of the chopper to obtain 50% of the rated torque at the rated speed and the rated field current is
<img src='./qimages/3399-160.jpg'>
161. An open-loop system is better than a closed-loop system in terms of
Accuracy
Stability
Noise reduction
Sensitivity
162. A CRO cannot be used for direct measurement of
Voltage
Current
Frequency
Power
163. The cycle time of a PLC is the time it takes to
read all the input signals.
read all the input signals, run the program and update outputs.
read an input signal.
check all the input signals against the program.
164. The thermocouple pair that gives the maximum sensitivity around 273 °k is
Platinum Constantan
Nichrome Constantan
Nickel Constantan
Copper Nickel
165. An inverse transducer converts
electrical energy to any other form of energy
electrical energy to light energy
mechanical displacement into electrical signal
electrical energy to mechanical form
166. Optical Pyrometer is used to measure
Light Intensity
Low Temperature
High Temperature
Light Intensity High Temperature
167. Horizontal deflection plates of CRO are placed generally
Horizontal
Vertical
Diagonal
or
168. A controller essentially is a/an
Amplifier
Sensor
Comparator
Clipper
169. Programming Languages for PLC is/are
Ladder Diagram
Function Block Diagram
Structured Text
All of the above
170. To measure insulation resistance of equipments of voltage rating upto 440 V the megger generator must generate
220 V
440 V
500 V
None of these
171. Lissajous pattern obtained on a CRO screen is a circle. Frequency of two signals are
Equal
Unequal
Zero
Infinity
172. Indicating instruments should be
undamped
critically damped
over damped
under damped
173. A megger is to measure insulation resistance of a cable. The cable should be connected to
Battery
DC supply
AC supply
No supply
174. A strain gauge is a passive transducer and is employed for converting
Pressure into change in resistance
Force into displacement
Mechanical displacement into a change of resistance
None of the above
175. A megger is basically a/an
Moving iron type instrument
Moving coil type instrument
Hot wire instrument
Electrolytic instrument
176. The dynamic characteristics of capacitive transducer are similar to those of
Low-pass filter
High-pass filter
Notch filter
Band-stop filter
177. The insulation resistance test is performed on power lines with
ohm meter
earth tester
megger
Any of these
178. Piezo meter is used to measure
Very high pressure
Very low pressure
Displacement
None of these
179. Which of the following devices is used to measure flow in an open channel
Venturimeter
Rota meter
Orifice
Pitot tube
180. The ladder diagram for the circuit shown below is
<img src='./qimages/3399-180.jpg'>