Exam Details
| Subject | measurements and instrumentation (ee) | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Government Degree College, Kamalpur | |
| Position | ||
| Exam Date | April, 2018 | |
| City, State | tripura, dhalai |
Question Paper
E E4811 Pages: 2
Page 1 of 2
Reg
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018
Course Code: EE208
Course Name: MEASUREMENTS AND INSTRUMENTATION
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 5 marks Marks
1 Resistance of unknown resistance determined byWheatstone bridge given by R4=
R1R2/R3where limiting values of various resistances are R1= 500Ω R2
=615Ω 1%. R3 100Ω +0.5 %.Calculate:
Nominal value of unknown resistor
ii) Absolute error of unknown resistor in ohm.
iii) Limiting error in percentage of unknown resistor.
2 Classify resistances based on the range of measurement.With neat sketch
describe the loss of charge method for the measurement of insulation resistance
of length of a cable.
3 Define the terms related to instrument transformer:
Transformation ratio ii) Nominal Ratio iii) Burden.
4 Describe the method for determination of B-H curve of magneticmaterial
usingstep-by step method.
5 With the help of diagram indicate the calibration of wattmeter using dc
potentiometer.
6 Describe bonded and unbonded strain gauge with their principle of operation.
7 What isLissajous pattern? Clearly indicate the factors on which shape of these
figures depends.
8 Compare temperature measurement using RTD and thermistors.
PART B
Answer any two questions, each carries 10 marks
9 Draw the block diagram of a typical measurement system and indicate the
functional elements in detail.
Describe the construction and working principle of single phase induction
type energy meter.
10 Amoving coil ammeter has fixed shunt of 0.01Ω.With a coil resistance of
750Ω and a voltage drop of 500mV across it, the full scale deflection is
obtained. Calculate current through shunt. Calculate resistance of meter
to give full scale deflection if shunted current is 60A.
Give the construction and working principle of dynamometer type
instrument. Also indicate the different errors in dynamometer type watt
meters.
11 With the help of neat sketch describe the method of measurement of earth
resistance.
The coil of a moving coil voltmeter is 40 mm long and 30 mm wide and has 100
turns on it. The control spring exerts a torque a torque of 240x10-6Nm when the
deflection is 100 divisions on full scale. If the flux density of magnetic field in
air-gap is 1wb/m2. Calculate the resistance that must be put in series with the coil
to give 1V/division. The resistance of voltmeter coil may be neglected.
E E4811 Pages: 2
Page 2 of 2
PART C
Answer any two questions, each carries 10 marks
12 Give the basic principle of working of an electrostatic voltmeter. Also describe
how would you increase operating forces
Describe an experiment for obtaining flux density in a specimen of magnetic
material with the help of ballistic galvanometer.
13 Mention the digital methods for determining rotational speed.
A 1000/5A, 50 Hz current transformer has a secondary burden comprising a
non-inductive impedance of 1.6Ω. The primary winding has one turn. Calculate
the flux in the core and ratio error at full load. Neglect leakage reactance and
assume iron loss in the core to be 1.5W at full load and mmf=100A.
14 State the components of iron loss and write down their expressions.
Describe the working of hall effect sensors.
A solenoid 1m long and wound with 960 turns has a search coil of 60 turns
and cross-sectional area 340mm2 at its centre.Reversing a current of 3.5A in the
solenoid causes a deflection of 4 divisions in a ballistic galvanometer connected
to the search coil.Calculate:
i)Galvanometer constant in flux linkages per division ii) Flux linkage sensitivity
PART D
Answer any two questions, each carries 10 marks
15 Define transducers and classify them.
Using Schering bridge show how capacitance and dissipation factor of unknown
capacitor is measured.
16 Draw the block diagram of generalized digital data acquisition system and
describe the function of each component.
Draw the block diagram of digital Storage oscilloscope. State the three modes of
operation
Define the deflection sensitivity of CRT.
17 With the help of neat sketch explain the working of LVDT. Also draw its
characteristics.
Determine the equivalent parallel resistance and capacitance that causes a Wein
bridge to null with the following component values. R1=2.7K,
R2=22K, R4=100K operating frequency 2.2KHz.
Page 1 of 2
Reg
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018
Course Code: EE208
Course Name: MEASUREMENTS AND INSTRUMENTATION
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each carries 5 marks Marks
1 Resistance of unknown resistance determined byWheatstone bridge given by R4=
R1R2/R3where limiting values of various resistances are R1= 500Ω R2
=615Ω 1%. R3 100Ω +0.5 %.Calculate:
Nominal value of unknown resistor
ii) Absolute error of unknown resistor in ohm.
iii) Limiting error in percentage of unknown resistor.
2 Classify resistances based on the range of measurement.With neat sketch
describe the loss of charge method for the measurement of insulation resistance
of length of a cable.
3 Define the terms related to instrument transformer:
Transformation ratio ii) Nominal Ratio iii) Burden.
4 Describe the method for determination of B-H curve of magneticmaterial
usingstep-by step method.
5 With the help of diagram indicate the calibration of wattmeter using dc
potentiometer.
6 Describe bonded and unbonded strain gauge with their principle of operation.
7 What isLissajous pattern? Clearly indicate the factors on which shape of these
figures depends.
8 Compare temperature measurement using RTD and thermistors.
PART B
Answer any two questions, each carries 10 marks
9 Draw the block diagram of a typical measurement system and indicate the
functional elements in detail.
Describe the construction and working principle of single phase induction
type energy meter.
10 Amoving coil ammeter has fixed shunt of 0.01Ω.With a coil resistance of
750Ω and a voltage drop of 500mV across it, the full scale deflection is
obtained. Calculate current through shunt. Calculate resistance of meter
to give full scale deflection if shunted current is 60A.
Give the construction and working principle of dynamometer type
instrument. Also indicate the different errors in dynamometer type watt
meters.
11 With the help of neat sketch describe the method of measurement of earth
resistance.
The coil of a moving coil voltmeter is 40 mm long and 30 mm wide and has 100
turns on it. The control spring exerts a torque a torque of 240x10-6Nm when the
deflection is 100 divisions on full scale. If the flux density of magnetic field in
air-gap is 1wb/m2. Calculate the resistance that must be put in series with the coil
to give 1V/division. The resistance of voltmeter coil may be neglected.
E E4811 Pages: 2
Page 2 of 2
PART C
Answer any two questions, each carries 10 marks
12 Give the basic principle of working of an electrostatic voltmeter. Also describe
how would you increase operating forces
Describe an experiment for obtaining flux density in a specimen of magnetic
material with the help of ballistic galvanometer.
13 Mention the digital methods for determining rotational speed.
A 1000/5A, 50 Hz current transformer has a secondary burden comprising a
non-inductive impedance of 1.6Ω. The primary winding has one turn. Calculate
the flux in the core and ratio error at full load. Neglect leakage reactance and
assume iron loss in the core to be 1.5W at full load and mmf=100A.
14 State the components of iron loss and write down their expressions.
Describe the working of hall effect sensors.
A solenoid 1m long and wound with 960 turns has a search coil of 60 turns
and cross-sectional area 340mm2 at its centre.Reversing a current of 3.5A in the
solenoid causes a deflection of 4 divisions in a ballistic galvanometer connected
to the search coil.Calculate:
i)Galvanometer constant in flux linkages per division ii) Flux linkage sensitivity
PART D
Answer any two questions, each carries 10 marks
15 Define transducers and classify them.
Using Schering bridge show how capacitance and dissipation factor of unknown
capacitor is measured.
16 Draw the block diagram of generalized digital data acquisition system and
describe the function of each component.
Draw the block diagram of digital Storage oscilloscope. State the three modes of
operation
Define the deflection sensitivity of CRT.
17 With the help of neat sketch explain the working of LVDT. Also draw its
characteristics.
Determine the equivalent parallel resistance and capacitance that causes a Wein
bridge to null with the following component values. R1=2.7K,
R2=22K, R4=100K operating frequency 2.2KHz.
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