Q.1

The output of a Mealy system is 1 if there has been a pattern ofotherwiseThe minimum state for this system is :

  • 4
  • 5
  • 6
  • 7
Q.2

Consider aPLL with RT =kΩ and CT = 0.μF. What is the output frequency of the VCO?

  • 10 kHz
  • 5 kHz
  • 2.5 kHz
  • 1.25 kHz
Q.3

4 point DFT for x(n) = {-is

  • {6, 4 - 2j, 2, 2j}
  • {6, 4j, 2, - 4j}
  • {6, -1 + 3j, 4 - 4j, 4 - 2}
  • {6, 2j, 4 - 2j, - 2 + 2j}
Q.4

Which of the following transducers requires a high input impedance preamplifier for proper measurements?

  • Thermocouple
  • Piezoelectric
  • Thermistor
  • L.V.D.T
Q.5

With reference to C programming language, which of the following statements are correct?

  1. An identifier may start with an underscore.
  2. An identifier may end with an underscore.
  3. If is a valid identifier.
  4. The number of significant characters in and identifier is implementation dependent.
Select the correct answer from the codes given below:
  • 1 and 2 only
  • 2 and 3 only
  • 1, 2, 3 and 4
  • 3 and 4 only
Q.6

Assertion (A): Ideal current sources and ideal voltage sources do not exist in reality.

Reason (R): All sources have finite internal impedances.

  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R are individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.7

A signal occupies a band 5 kHz tokHz. For proper error free reconstruction at what rate it should be sampled?

  • 10 kHz
  • 20 kHz
  • 5 kHz
  • (10 + 5) x 2 kHz
Q.8

By what name is the equation Δ . J = 0 frequency known?

  • Poisson's equation
  • Laplace's equation
  • Continuity equation for steady currents
  • Displacement equation
Q.9

Which of the following is true?

  • The poisson distribution is limiting case of binomial distribution.
  • In symmetrical distribution, the mean, median and mode coincide.
  • Regression is the estimation or production of unknown values of one variables from known values of another variable.
  • All are true.
Q.10

The output of a Mealy system is 1 if there has been a pattern ofotherwiseThe minimum state for this system is :

  • 4
  • 5
  • 6
  • 7
Q.11

In a conventional AM superhetrodyne receivers, the detectors employed to extract intelligence include

  • Peak detectors
  • Ratio detectors
  • PLL
  • Slope detectors
Q.12

Assertion (A): The h-parameter model of a BJT can be derived from its hybrid-p model and vice-versa.

Reason (R): The hybrid-p model has many more additional elements as compared to h-parameter model of the BJT.

  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R are individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.13

Thin gate oxide in a CMOS process in preferably grown using

  • wet oxidation
  • dry oxidation
  • epitaxial deposition
  • ion implantation
Q.14

Consider the following statements, regarding an OP AMP:

  1. All types of negative feedback reduce non-linear distortion.
  2. All types of negative feedback reduce the output offset voltage.
  3. Non-inverting (current and voltage) feedback increases the input impedance.
  4. Inverting (current and voltage) feedback decreases input impedance.
Which of the above statements is/are correct?
  • 1 only
  • 2 and 3 only
  • 2 and 4 only
  • 1, 2, 3 and 4
Q.15

Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are not violated?

  • Tellegen's theorem
  • Reciprocity theorem
  • Maximum power transfer theorem
  • Superposition theorem
Q.16

Which of the following describe the correct properties of an emitter follower circuit?

  1. It is a voltage series feedback circuit.
  2. It is a current series feedback circuit.
  3. Its voltage gain in less than unity.
  4. Its output impedance is very low.
Select the correct answer from the codes given below:
  • 1, 3 and 4
  • 2, 3 and 4
  • 2 and 3 only
  • 2 and 4 only
Q.17

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The wavelength of waveguide at frequency 3 GHz

  • 25 cm
  • 100 cm
  • 16.13 cm
  • 23.09 cm
Q.18

A surface charge density of 8 nc/m2 is present on a plane x = z. A line charge density ofnC/m is present on line x =y = 2 Find VAB for points A(and B(1)

  • 583.38 V
  • 58.338 V
  • 583.38 mV
  • 58.338 mV
Q.19

The property not valid for basic singularity function is

  • it is even signal
  • convolution of any arbitrary function x{t) and an impulse is the original function itself.
  • the sum of two impulses at same location is the impulse with the strength equal to the summation of individual strengths.
  • none of these.
Q.20

Which of the following circuits come under the class of combinational logic circuits?

  1. Full adder
  2. Full subtractor
  3. Half adder
  4. J-K flip-flop
  5. Counter
Select the correct answer from the codes given below:
  • 1 only
  • 3 and 4
  • 4 and 5
  • 1, 2 and 3
Q.21

The multiplication of two n bit numbers gives a product of length less than or equal to

  • n bits
  • 2n bits
  • 2n bits
  • 2n - 1 bits
Q.22

Consider the following statements:
The bias stability of an emitter-bias amplifier circuit improves by

  1. decreasing the value of RB
  2. increasing the value of RE
  3. decreasing the value of RB
  4. increasing the value of RB
  5. increasing the value of RC
Which of the above statements are correct?
  • 1 and 2
  • 2 and 3
  • 3 and 4
  • 4 and 5
Q.23

Which of the following statements about the matched filter in a communication receiver are correct?

  1. Its impulse response depends on the signed shape
  2. It maximizes the SNR at the detection shape.
  3. It produces ISI.
  4. It may produce phase error if synchronization is improper.
Select the correct answer from the codes given below:
  • 1 and 4 only
  • 1 and 2 only
  • 2, 3 and 4
  • 1, 2 and 4
Q.24

Which of the following devices is a 'hot-electron' diode?

  • Thermionic tube diode
  • Schottky-Barrier diode
  • Thomson-Deletion diode
  • Thermal electron diode
Q.25

Consider the following statements about a good power supply:

  1. The a.c. ripple should be high
  2. Sv, (Voltage stability factor) should be low
  3. ST, (Temperature stability factor) should be low
Which of the above statements are correct?
  • 1, 2 and 3
  • 2 only
  • 3 only
  • 2 and 3 only
Q.26

The input and output of a continuous time system are respectively denoted by x(t) and y(t) Which of the following descriptions corresponds to a causal system?

  • y(t) = x(t - 2) + x(t + 4)
  • y(t) = x(t - 4) + x(t + 1)
  • y(t) = x(t + 4) + x(t - 1)
  • y(t) = x(t + 5) + x(t + 5)
Q.27

NMOS devices have __________ switching speeds and __________ on-state resistance; as compared with PMOS devices.

  • slower, higher
  • faster, lower
  • faster, higher
  • slower, lower
Q.28

Which of the following is equivalent to x?

  • x EX-OR 0
  • x EX-NOR 0
  • 1 NOR x
  • x AND x
Q.29

Consider the following statements:

  1. Internal sorting is used if the number of items to be sorted is very large.
  2. External sorting is used if the number of items to be sorted is vary large.
  3. External sorting needs auxiliary storage.
  4. Internal sorting needs auxiliary storage.
Which of the above statements are correct?
  • 1 and 2
  • 2 and 3
  • 3 and 4
  • 2 and 4
Q.30

Consider the following:

  1. Si
  2. Ge
  3. GaAs
  4. InP
Which of the above semiconductors should be used for making highly efficient photodiodes?
  • 1 and 4 only
  • 3 and 4 only
  • 1, 3 and 4
  • 2, 3 and 4
Q.31

The characteristic polynomial of a system is q(s) = 2s5 + s4 + 4s3 + 2s2 +The system is :

  • stable
  • marginally stable
  • unstable
  • oscillatory
Q.32

A DC voltage source is connected across a series R - L - C circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

  • R only
  • C only
  • L only
  • R and L combination
Q.33

A rectangular wave guide is designed to propagate at the dominant mode TE10 at a frequency of 5 GHz. The cut-off frequency is 0.8 of signal frequency. The ratio of the guide width to height isThe dimensions of the guide are

  • 3.75 cm, 1.875 cm
  • 4 cm, 2 cm
  • 8 cm, 4 cm
  • 2.54 cm, 1.27 cm
Q.34

The fuse material used in electrical lines must have which one of the following properties?

  • High resistivity
  • Low conductivity
  • High melting point
  • Low melting point
Q.35

Which of the following statements is not correct?

  • Propagation delay is the time required for a gate to change its state
  • Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state
  • Fan-in of a gate is always equal to fan-out of the same gate
  • Operating speed is the maximum frequency at which digital data can be applied to a gate
Q.36

If D, G and η denote the directly, power gain and efficiency of an antenna, then which of the following relation holds :

  • DGη = 1
  • η = DG
  • D = ηG
  • D = G/η
Q.37

If the potential functions V1 and V2 satisfy Laplace's equation within a closed region and assume the same values on its surface, then which of the following is correct?

  • V1 and V2 are identical
  • V1 is inversely proportional to V2
  • V1 has the same direction as V2
  • V1 has the same magnitude as V2 but has different direction
Q.38

Which one of the following statements is correct for MOSFETS?

  • p channel MOS is easier to produce than n channel MOS
  • n channel MOS must have twice the area of p channel MOS for the same ON resistance
  • p channel MOS has faster switching action than n channel MOS
  • p channel MOS has higher packing density than n channel MOS
Q.39

Which of the following bridges is also used in an oscillator?

  • Maxwell
  • Schering
  • Hay
  • Wien
Q.40

A lossless transmission line with air dielectric is 6 m long. what is the phase constant?

  • 1p rad/m
  • 2p rad/m
  • 0.2p rad/m
  • 0.1p rad/m
Q.41

A memoryless source emits n symbols each with a probability p. The entropy of the source as a function of n

  • increases as log n
  • decreases as log (1/n)
  • increases as n
  • increases as n log n
Q.42

If there is phase error in the carrier signal for the detection of SSB signals, then

  • the output gets reduced, but a phase distortion results
  • the output is not reduced, but a phase distortion results
  • the output is not reduced, and also no distortion
  • the output is reduced, no phase distortion
Q.43

How many and which types of machine cycles are needed to execute PUSH PSW bymicroprocessor?

  • 2, Fetch and memory write
  • 3, Fetch and memory write
  • 3, Fetch and memory read
  • 3, Fetch and memory read and memory write
Q.44

In a series LCR circuit the maximum inductor voltage is twice the maximum capacitor voltage however current lags byand drop across the inductance is vL =sin 377t V. Assuming the resistance beingΩ, Find the values of the capacitance and inductance.

  • 235 μF, 61.18 μH
  • 230 μF, 61.18 μH
  • 61.18 μF, 230 μH
  • None of the above
Q.45

Unit doublet is the Laplace inverse of __________ .

  • 1/s
  • s2
  • s
  • none of these
Q.46

The Wheatstone bridge method of measuring resistance is ideally suited for the measurement of resistance values in the range of

  • 0.001 to 1 Ω
  • 0.1 to 100 Ω
  • 100 Ω to 10 kΩ
  • 100 kΩ to 10 MΩ
Q.47

Which device can detect the presence of both forward and backward waves in a waveguide?

  • Filter
  • Detector
  • Directional coupler
  • Magic T
Q.48

The correct sequence of subsystems in an FM receiver is

  • Mixer, RF amplifier, Limiter, IF amplifier. Discriminator, Audio amplifier
  • RF amplifier, Mixer, IF amplifier, Limiter, Discriminator, Audio amplifier
  • RF amplifier, Mixer, Limiter, Discriminator IF amplifier, Audio amplifier
  • Mixer, IF amplifier, RF amplifier, Audio amplifier, Discriminator
Q.49

Which of the following statements about the matched filter in a communication receiver are correct?

  1. Its impulse response depends on the signed shape
  2. It maximizes the SNR at the detection shape.
  3. It produces ISI.
  4. It may produce phase error if synchronization is improper.
Select the correct answer from the codes given below:
  • 1 and 4 only
  • 1 and 2 only
  • 2, 3 and 4
  • 1, 2 and 4
Q.50

A DC voltage source is connected across a series R - L - C circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

  • R only
  • C only
  • L only
  • R and L combination
0 h : 0 m : 1 s