Q.1

Which of the following is equivalent to x?

  • x EX-OR 0
  • x EX-NOR 0
  • 1 NOR x
  • x AND x
Q.2

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.3

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.4

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

  • stable
  • marginally stable
  • unstable
  • oscillatory
Q.5

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.6

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.7

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.8

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.9

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.10

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.11

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.12

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

  • Maxwell
  • Schering
  • Hay
  • Wien
Q.13

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.14

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.15

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.16

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.17

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.18

Unit doublet is the Laplace inverse of __________ .

  • 1/s
  • s2
  • s
  • none of these
Q.19

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.20

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

  • Filter
  • Detector
  • Directional coupler
  • Magic T
Q.21

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.22

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.23

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.24

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.25

In the Taylor series expansion of exp(x) + sin(x) about the point x = p, the coefficient of (x - p)2 is

  • exp (p)
  • 0.5 exp (p)
  • exp (p) + 1
  • exp (p) - 1
Q.26

With respect to transmission parameters, which one of the following is correct?

  • B and C are dimensionless
  • A and B are dimensionless
  • A and D are dimensionless
  • B and D are dimensionless
Q.27

Why npn-transistors are preferred over pnp-transistors?

  • Leakage current in npn-transistors is less than pnp-transistors
  • Mobility of majority carrier in npra-transistors is greater than the mobility of majority carrier in pnp-transistors
  • Bias voltage required in npn is less than in/wp-transistors
  • Bias voltage required in npn is greater than in pnp-transistors
Q.28

Which of the following is NOT associated with a p-n junction?

  • Junction capacitance
  • Charge Storage Capacitance
  • Depletion Capacitance
  • Channel Length Modulation
Q.29

F = ∑(=

  • [B ⊕ C] + AC
  • B'C' + BC + AC
  • AB + BC + CA
  • None
Q.30

In the following circuit , the comparator output in log: "I" if V1 > V2 and is logic "otherwise. The D/A conversion is done as per the relations VDAC = 2n-2 Volts, where b3 (MSB), b2, b1 and b0 (LSB) are the counter outputs. The counter starts from the clear state

The stable reading of the LED display is

  • 06
  • 07
  • 12
  • 13
Q.31

Choose the correct statement

  • The reflection coefficient (r) of a transmission line is greater than 1
  • r varies from 0 to ∞
  • r is less than or equal to 1
  • r varies from - ∞ to + ∞
Q.32

If (x x(10)x = (100)x; (100)x x (100)x = (10000)x then x can take value

  • 2
  • 5
  • 10
  • All
Q.33

Consider two random processes x(t) and y(t) have zero mean, and they are individually stationary. The random process is z(t) = x(t) + y(t). Now when stationary processes are uncorrelated then power spectral density of z(t) is given by

  • Sx(f) + Sy(f) + 2Sxy(f)
  • Sx(f) + Sy(f) + 2Sxy(f) + 2Syx(f)
  • Sx(f) + Sy(f)
  • Sx(f) + Sy(f) - 2Sxy(f) - 2Syx(f)
Q.34

Inmicroprocessor based system running at 3 MHz clock frequency what should be the minimum pulse width of the INTR signal, so that it is recognized successfully?

  • 0.33 μs
  • 0.666 μs
  • 5.8 μs
  • none of these
Q.35

A n-type silicon sample contains a donor concentration of Nd = 2 x 1016 cm-3. The minority carrier hole lifetime is tp0 = 5 μs. The thermal equilibrium generation rate of hole is:

  • 1.125 x 109 cm-3 s-1
  • 0.625 x 109 cm-3 s-1
  • 4.5 x 109 cm-3 s-1
  • 2.25 x 109 cm-3 s-1
Q.36

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.37

For parallel plane waveguides, which is the mode with lowest cut-off frequency?

  • TE10
  • TM10
  • TEM
  • TE11
Q.38

Which of the following conditions must be satisfied for a transistor to remain under saturation?

  1. Its collector to base junction should be under forward bias.
  2. Its collector to base junction should be under reverse bias.
  3. Its emitter to base junction should be under reverse bias.
  4. Its emitter to base junction should be under forward bias.
Select the correct answer from the codes given below:
  • 1 and 2
  • 1 and 3
  • 2 and 3
  • 1 and 4
Q.39

Costa's receiver is used for

  • Coherent detection of AM-SC signal
  • Asynchronous detection of AM-SC signal
  • Coherent detection of DSB-SC signal
  • Asynchronous detection of DSB-SC signal
Q.40

Epitaxial growth is used in ICs

  • because it produces low parasitic capacitance
  • because it yields back to back isolating pn junction
  • to grow single crystal n doped silicon on a single crystal p type substrate
  • to grow selectively single crystal p doped silicon of one resistivity on a p type substrate of a different resistivity
Q.41

A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with er =The reflection coefficient for normal incidence is

  • 0.6 ∠0°
  • 1 ∠0°
  • 0.6 ∠180°
  • 1.2 ∠180°
Q.42

The transfer characteristic for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes)

Q.43

Consider two random processes x(t) and y(t) have zero mean, and they are individually stationary. The random process is z(t) = x(t) + y(t). Now when stationary processes are uncorrelated then power spectral density of z(t) is given by

  • Sx(f) + Sy(f) + 2Sxy(f)
  • Sx(f) + Sy(f) + 2Sxy(f) + 2Syx(f)
  • Sx(f) + Sy(f)
  • Sx(f) + Sy(f) - 2Sxy(f) - 2Syx(f)
Q.44

If the intrinsic resistivity at 300°K is 0.ohm-m and the electron and hole mobilities at 300°K are 0.and 0.m2/volt-sec, then the intrinsic carrier concentration of Germanium is __________ .

  • 2.92 x 1019/m3
  • 2.92 x 10-19/m3
  • 1.92 x 1019/m3
  • 3.92 x 1019/m3
Q.45

In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

  • radius as well as operating wavelength are halved
  • radius as well as operating wavelength are doubled
  • radius is halved and operating wavelength is doubled
  • radius is doubled and operating wavelength is halved
Q.46

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

  • Maxwell
  • Schering
  • Hay
  • Wien
Q.47

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.48

The maximum concentration of the element which can be dissolved in solid silicon at a given temperature is termed as

  • Solid solubility
  • Dissolution coefficient
  • Solidification index
  • Concentration index
Q.49

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.50

When a particular mode is existed in a waveguide, there appears an extra electric component, in the direction of propagation. In what mode is the wave propagating?

  • Transverse electric
  • Transverse magnetic
  • Transverse electromagnetic
  • Longitudinal
0 h : 0 m : 1 s