1. Which diode exhibits negative resistance characteristics
Zener
Tunnel
Schottky
PIN
2. Which crystal structure is preferred to fabricate BJT in VLSI technology



None of the above
3. Network contains only independent current sources and resistors. If the values of the all resistors are doubled, the value of the node voltages will
become half
remain unchanged
become double
be undeterminate
4. A 10 V source is connected in series with a 1 W resistor and 1 H inductor and the switch is closed at t the current in circuit is
10 10 e100 t
10 10 e100 t
10 10 e-100 t
10 10 e-100 t
5. A differential amplifier is used at the input stage of an Op Amp to give very high
CMRR
Bandwidth
Slew rate
Open loop gain
6. What is the current sourcing capacity of 7805 IC voltage regulator
0.5 Amp
2 Amp
1 Amp
5 Amp
7. Which is the fastest logic family
TTL
CMOS
RTL
ECL
8. The minimum number of NAND gates to implement A A-B A-BC
Zero
1
4
5
9. In which T state of every machine cycle for 8085 does ALE signal become active
T2
T1
T3
T4
10. The bit addressable RAM area in 8051 microcontroller is
00 H 1 F H
20 H 2 F H
30 H 3 F H
40 H 4 F H
11. What is the storage space required for a character
1 byte
2 bytes
3 bytes
4 bytes
12. Which is an infinite loop in C language
for 0 x 10, x
for x 10)
for 0 x 10)
for x
13. The direction of propagation of EM wave is obtained from
×

×

14. The length of an antenna operating at frequency 0.5 GHz is
570 m
5.70 m
57.0 m
600 m
15. A pre-emphasis circuit provides extra noise immunity by
boosting the bass frequencies.
amplifying the higher audio frequencies.
pre-amplifying the whole audio band.
converting the phase modulation to FM.
16. In order to separate channels in a TDM receiver, it is necessary to use
AND gates
band pass filters
differentiators
integrators
17. The capacitive current flowing through the junction of a thyristor is given by
C × dt /dv
1/C dv/ dt
1/C dt /dv
C dv /dt
18. A dual converter is used in where
Reversible d.c. is required.
a.c. of higher frequency is required.
a.c. of low frequency is required.
ripple free d.c. is required.
19. Which is the static specification of a transducer
Rise time
Settling time
Hysteresis
Frequency response
20. In which mode the controller works as a variable gain amplifier
On-off
Proportional
Integral
PID

21. Assertion The temperature compensation circuits require additional hardware and add to the complexity, instead one zener diode sufficies the work.

Reason The temperature coefficient of 5 V zener diode is nearly zero.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
22. Assertion The z-transforms study yields information on placement of poles and zeroes in s-plane.

Reason Poles on the real axis in left half of s-plane give exponentially decaying response.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
23. Assertion Current 4-20 mA loop overcomes the problem of loop resistance leading to signal degradation.

Reason V to F convertor is preferred because it is not affected by loop resistance.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
24. Assertion NAND gate provides universality.

Reason The universality is possible by De-Morgan's theorem.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
25. Assertion Queue system is not provided in 8086 microprocessor.

Reason Queue helps interfacing slow memory without speed degradation.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
26. Assertion The memory addresses are manipulated in through pointers.

Reason Pointers in can be added.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
27. Assertion Ionosphere is used for the transmission of HF waves.

Reason They are reflected back by the F1 and F2 layers.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
28. Assertion Choppers are used for the speed control of d.c. drives.

Reason Cycloconverters may not be used for the control of d.c. drives.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
29. Assertion Optical fiber provides the attenuation of the order of 0.2 dB/km.

Reason Rayleigh scattering increases with the increase in the operating wavelength.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
30. Assertion Telemetry is used for smart instrumentation in digital control systems in modern industrial units.

Reason They are capable of measuring the parameters of a process at a distance.

Codes
Both and are true and is the correct explanation of
Both and are true but is not correct explanation of
is true but is false.
is false but is true.
31. See the stages in IC Fabrication below

Etching
Cleaning
Masking and exposure
Application of photo resist

Mention the correct sequence followed




32. Consider the input impedance of the following

open loop Op Amp
BJT
MOSFET
JFET

Which is the way of showing the decrease in input impedance




33. Consider the following logic families

CMOS
TTL
LS TTL
ECL

Write the sequence of power consumption in increasing order.




34. Consider the quantum efficiency of the detector in optical communication.

Photo diode
Photo transistor
APD
PIN diode

Write the quantum efficiency of the above devices in decreasing order.




35. Consider the following transducers.

Thermistor
Thermocouple
RTD
IC sensor

Write the linearity order of the above in increasing order.




36. Match List-I with List-II, and select the correct answers using the codes given below the lists

List-I List-II
SCR Relaxation oscillator
Zener diode Voltage variable resistor
UJT Voltage regulator
FET Controlled Rectifier

Codes





37. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
Bode plot Current source
Transient analysis Frequency domain
Norton's theorem Stability analysis
Fourier's Transform Laplace transform

Codes





38. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
IC-723 Lock-range
Oscillators 25 mA
IC-741 Voltage regulator
PLL Positive feedback

Codes





39. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
Flip flop Digital Multimeters
Counters Memory
XOR-gates Data acquisition systems
D to A convertor Parity checkers

Codes





40. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
8085 On chip timer
8086 Serial I/O pins
8255 Segmented memory
8051 Hand-shake mode

Codes





41. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
Character storage space

O/p Array of characters while
Infinite Loop 1-byte
bring cursor to the beginning of current line S

Codes





42. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
EDFA Ability to collect the light
LASER Optical Amplifiers
Numerical Aperture Spontaneous Emission
LED Stimulated Emission

Codes





43. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
FM Microwave generator
AM Ratio detector
Quantization PCM
Magnetron Envelope detector

Codes





44. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
RTD Infinite Resolution
Hall Effect Change of Resistance
Instrumentation Amplifier Magneto resistance
LVDT High end variable gain

Codes





45. Match List-I with List-II and select the correct answers using the codes given below the lists

List-I List-II
On-off control Stability
Proportional control Dead zone
PID Residual error
Routh-Hurwitz Zero offset error

Codes





46. Read the passage below, answer the questions from 46 to 50, that follow based on your understanding of the passage.

Frequency modulation and phase modulation are two forms of angle modulation which is a form of continuous wave or analog modulation whose chief characteristics are as follows

The amplitude of the modulated carrier is kept constant.
The frequency of the modulated carrier is varied by the modulating voltage.

In frequency modulation the carrier's frequency deviation is proportional to the instantaneous amplitude of the modulating voltage. In phase modulation, the carrier's phase deviation is proportional to the instantaneous amplitude of the modulating voltage. It has been mathematically shown that as the modulating frequency decreases and the modulating voltage amplitude remains constant the modulation index increases. The modulation index determines how many side bands have significant amplitude. The major advantages of angle modulation over amplitude modulation are

The transmitted amplitude is constant and thus the receiver can be fitted with an efficient amplitude limiter this characteristics has the advantage of improving immunity to noise and interference.
Since there is no natural limit to the modulation index, it can be increased to provide additional noise immunity.

The noise-signal distribution is rectangular in AM and PM, whereas triangle in FM. To reduce the effect of noise wideband FM is used for broadcast transmissions for the sound accompanying TV transmissions. Narrow band FM is used for communications in competition with single side band having its main applications in various forms of mobile communications. The reactance modulator is a direct method of generating FM. The alternative means of generating FM the Armstrong system is one of which PM is initially generated but the modulating frequencies are correctly bass-boosted thus FM results in output. A very small frequency deviations are possible in basic Armstrong system.

46. In the spectrum of frequency modulated wave
the carrier frequency disappears when the modulation index is large.
the amplitude of any sideband depends on the modulation index.
the total number of sideband depends on the modulation index.
the carrier frequency cannot disappear.
47. The difference between phase and frequency modulation
is purely theoretical because they are the same in practice.
is too great to make the two system compatible.
lies in the different definitions of the modulation index.
lies in the poorer audio response of phase modulation.
48. Indicate the false statement regarding the Armstrong modulation system.
The system is basically phase modulation not FM.
Automatic frequency control is not needed as a crystal oscillator is used.
FM must be used.
Equalization is unnecessary.
49. Since noise-phase modulates the FM wave as the noise sideband frequency approaches the carrier frequency, the noise amplitude
remains constant
is decreased
is increased
is equalized
50. Indicate which one of the following is not an advantage of FM and Amplitude Modulation
Better noise immunity is provided
Lower Bandwidth is required.
The transmitted power is more useful.
Less modulating power is required.