Q.1

Consider the following assertions
SI: For Zener effect at occur, a very abrupt junction is required
SFor quantum tunnelling to occur, a very narrow energy barrier is required
Which of the following is correct?

  • Only S2 is true
  • SI and S2 are both true but S2 is not a reason for SI
  • SI and S2 are both true and S2 is a reason for SI
  • Both SI and S2 are false
Q.2

Consider the following statements
A 4 :decoder can be constructed (with enable i/p) by

  1. Using four 2 : 4 decoders (each with an enable i/p) only
  2. Using five 2 : 4 decoders (each with an enable i/p) only
  3. Using two 3 : 8 decoders (each with an enable i/p) only
  4. Using two 3 : 8 decoders (each with an enable i/p) only
Which of the statements given above is/are correct?
  • 2 and 3
  • 1 only
  • 2 and 4
  • none
Q.3

Choose the correct statement/statements :

  • In case of an antenna, the antenna resistance and loss resistance are not two different quantities.
  • The loss resistance includes loss by eddy currents, improper earth connections, insulation leakages, etc., but not I2R losses.
  • Radiation resistance varies directly as square-root of frequency
  • None
Q.4

The spectral range of a band pass signal extends fromMHz to 10.4 MHz. What is the minimum sampling frequency required for reconstruction?

  • 20 MHz
  • 20.8 MHz
  • 20.4 MHz
  • 0.8 MHz
Q.5

A heavily doped semiconductor exhibits a __________ such a device is called sensistors.

  • negative temperature coefficient of resistance
  • positive temperature coefficient of resistance till a particular value of temperature and then it shown negative temperature coefficient of resistance
  • positive temperature coefficient of resistance
  • none of the above
Q.6

Method of images is applicable to which fields?

  • Electrostatic fields only
  • Electrodynamic fields only
  • Neither electrostatic fields nor electro-dynamic fields
  • Both electrostatic fields and electro-dynamic fields
Q.7

Which of the following is/are correct statement(s)?

  1. Bus is a group of wires carrying information.
  2. Bus is needed to achieve reasonable speed of operation.
  3. Bus can carry data or address.
  4. A bus can be shared by more than one device.
Select the correct answer from the codes given below
  • 1 only
  • 1 and 2 only
  • 2, 3 and 4 only
  • 1, 2, 3 and 4
Q.8

Assertion (A): There are no convergence issues with the discrete-time Fourier series in general.

Reason (R): A discrete-time signal is always obtained by sampling a continuous-time signal.

  • 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.9

Which is the dominant mode in rectangular waveguides?

  • TE10
  • TE11
  • TE01
  • TM11
Q.10

Which junction has least junction capacitance?

  • Alloy
  • Grown
  • Diffused
  • Point contact
Q.11

Consider a multiplexer with X and Y as data inputs and Z as control input. Z = 0 selects input X and Z = 1 selects input Y. What are the connections required to realize the 2-variable Boolean function f = T + R, without using any additional hardware?

  • R to X, 1 to Y, T to Z
  • T to X, R to Y, T to Z
  • T to X, R to Y, 0 to Z
  • R to X, 0 to Y, T to Z
Q.12

In orthogonal BFSK. the energy of information bearing term is :

  • the same as total transmitted energy
  • one half of total transmitted energy
  • one fourth of total transmitted energy
  • None
Q.13

The maximum positive and negative numbers which can be represented in 2's complement form using n bits are respectively

  • +(2n + 1 - 1), - (2n - 1 - 1)
  • +(2n + 1 - 1), - 2n - 1
  • +2n - 1, - 2n - 1
  • +2n + 1, - (2n - 1 + 1)
Q.14

When transistor is used as a switch __________ is defined as the interval which elapses between the transition of input waveform and the time when to transition toof Ic(sat).

  • storage time
  • fall time
  • turn-on time
  • turn-off time
Q.15

Which of the following is a circularly polarized antenna?

  • Horn
  • Dipole
  • Helical
  • Pyramidal
Q.16

The voltage applied to an R-L circuit at t = 0 when switch is closed iscos (t + 30°). The circuit resistance isΩ and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?

  • 1 A
  • 2 A
  • 5 A
  • 10 A
Q.17

How many distinct binary trees can be constructed with three nodes?

  • 1
  • 2
  • 3
  • 5
Q.18

Which of the following are the non-linear application of op-amp?

  1. Current-to-voltage converter
  2. Comparator
  3. Peak detector
  4. Limiter
Select the correct answer from the codes given below:
  • 1, 2 and 3
  • 2, 3 and 4
  • 1, 3 and 4
  • 1, 2 and 4
Q.19

Anmicroprocessor is operating at 2 MHz frequency and executes the following program :
START : MOV A, B
OUT 55H
DCR B
STA 2700H
NOP
NOP
JMP START
Identify the total number of machine cycles required to execute the above program till the JMP instruction is executed for the first time.

  • 12
  • 13
  • 14
  • 15
Q.20

Anexecutes the following instructions
LXI H, 30A0H
DAD H
PCHL
All addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.
Which of the following statements is correct?

  • PC = 2715 H HL = 30A0 H
  • PC = 30A0H HL = 2715H
  • PC = 6104 H HL = 6140 H
  • PC = 6140H HL = 2715H
Q.21

Which one of the following circuits is used for converting a sine wave into a square wave?

  • Astable multivibration
  • Monostable multivibration
  • Bistable multivibration
  • Schmitt trigger
Q.22

A super heterodyne receiver has a IF ofkHz. It is tuned to a station broadcasting atKHz and its oscillator is operating atKHz, then theKHz frequency would be

  • adjacent channel frequency
  • image frequency
  • gyro frequency
  • maximum usable frequency
Q.23

Which of the following meters requires an external power source for its operation?

  • P.M.M.C. meter
  • Hot wire ammeter
  • Electronic voltmeter
  • Electrodynamometer
Q.24

Which are of the following oscillators is well suited for the generation of wide range audio-frequency sine waves?

  • RC phase-shift oscillator
  • Wien-bridge oscillator
  • Colpitts oscillator
  • Hartley oscillator
Q.25

The maximum power dissipation capacity of a transistor ismW. If the collector emitter voltage isV, what is the safe collector current that can be allowed through the transistor?

  • 5 mA
  • 2.5 mA
  • 10 mA
  • 25 mA
Q.26

If the carrier modulated by a digital bit stream has one of the possible phases of 0°, 90°,and 270°. Then the modulation is called

  • BPSK
  • QPSK
  • QAM
  • MSK
Q.27

The internal resistance of a current source used in the model of a BJT while analyzing a circuit using BJT is :

  • very high
  • very low
  • zero
  • of the order of a few mega ohms
Q.28

Which one of the following type of negative feedback increases the input resistance and decreases the output resistance of an amplifier?

  • Current series feedback
  • Voltage series feedback
  • Current shunt feedback
  • Voltage shunt feedback
Q.29

Consider a situation where number of minterms with even number of 0's are same as number of minterms with odd number of 1's. Then minterms with even number of 0's and minterms with odd number of 1's are __________ to each other then number of variables is __________ .

  • equivalent, even
  • complement, odd
  • complement, even
  • none of these
Q.30

Compared to a p-n junction with NA = ND = 1014/cm3, which one of the following statements is TRUE for a p-n junction with NA = ND = 1020/cm3?

  • Reverse breakdown voltage is lower and depletion capacitance is lower
  • Reverse breakdown voltage is higher and depletion capacitance is lower
  • Reverse breakdown voltage is lower and depletion capacitance is higher
  • Reverse breakdown voltage is higher and depletion capacitance is higher
Q.31

Assertion (A): The line integral of B about a closed contour, in a region containing steady current, is μ0 times the total net current, following through the contour of integration.

Reason (R): The curl of B is equal to μ0 times the current density vector J

  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are 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.32

In a communication system, a process in which statistical averages and time averages are equal is called as,

  • stationary
  • ergodic
  • Gaussian
  • BIBO stable
Q.33

All poles and zeros of a driving point immittance function of an L-C network

  • should lie on the jω axis
  • should lie on the +ve real axis
  • should lie on the - ve real axis
  • can lie anywhere in s-plane
Q.34

Sampling frequency of
sin 100pt + cos 200pt + sin 100pt + cos 200pt is:

  • 100 Hz
  • 200 Hz
  • 400 Hz
  • none of these
Q.35

For real and odd signals, the Fourier series coefficient ak is __________ .

  • purely imaginary and even
  • purely real and even
  • purely imaginary and odd
  • purely real and odd
Q.36

Identification of highest priority interrupt can be achieved in a minimum time by which of the following schemes?

  • Hardwired polling
  • Priority encode circuit
  • Software polling
  • Subdivision of interrupt register into a number of sub registers which are checked parallely
Q.37

A super heterodyne receiver has an input circuit tuned to aKHz signal. If the intermediate frequency of the amplifier is tuned toKHz. The quality factor Q for a Image Rejection ratio of 125?

  • 100
  • 56.81
  • 42.74
  • 87
Q.38

Assertion (A): A fixed bias BJT circuit exhibits better performance as compared to a self bias BJT circuit.

Reason (R): A fixed bias BJT circuit used less components as compared to a self bias BJT circuit.

  • 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.39

Which of the following are the memory performance parameters?

  1. Access time and latency
  2. Block size and Block access time
  3. Cycle time and Bandwidth
Select the correct answer from the codes given below:
  • 1 only
  • 1 and 2 only
  • 2 and 3 only
  • 1, 2 and 3
Q.40

What is the chemical bonding in silicon semiconductor?

  • Metallic
  • Ionic
  • Covalent
  • van der Waals
Q.41

The probability density function of the envelope of narrow band noise is :

  • Uniform
  • Gaussian
  • Rayleigh
  • None
Q.42

For determining the network functions of a two-port network, it is required to consider that

  • all initial conditions remain same
  • all initial conditions are zero
  • part of initial conditions are equal to zero
  • initial conditions vary depending on nature of network
Q.43

The transfer function of a controller is given as Kp + Kd.s where Kp and Kd are constants. What type of controller is this?

  • Proportional
  • Proportional plus integral
  • Proportional plus derivative
  • Integral plus derivative
Q.44

Consider the following statements regarding registers and latches:

  1. Registers are made of edge-triggered FFs, whereas latches are made from level-triggered FFs.
  2. Registers are temporary storage devices whereas latches are not.
  3. A latch employs cross-coupled feedback connections.
  4. A register stores a binary word whereas a latch does not.
Which of the above statements is/are correct?
  • 1 only
  • 1 and 3
  • 2 and 3
  • 3 and 4
Q.45

A load ZL = RL + jXL is to be matched using an ideal transformer to generator of internal impedance ZS = RS + jXS. The ratio of transformer required is __________ .

  • |ZS|/|ZL|
  • RL/RS
  • RL/ZS
  • |ZL|/RS
Q.46

Given below a block diagram of oscillator circuit with various reactance elements.

For colpitts oscillator which is correct?

  • x1 = C, x2 = L, x3 = C
  • x1 = C, x2 = L, x3 = L
  • x1 = C, x2 = C, x3 = L
  • x1 = L, x2 = C, x3 = L
Q.47

The amplifier network is shown below:

re and z0 is:

  • 6.42 kΩ, 5.6 kΩ
  • 6.42 Ω, (5.62) kΩ
  • 6.4kΩ, (5.62) kΩ
  • 6.42 Ω, 5.6 kΩ
Q.48

Which of the following are universal gates?

  1. NAND
  2. NOR
  3. XOR
Select the correct answer from the codes given below:
  • 1 and 2 only
  • 1 and 3 only
  • 2 and 3 only
  • 1, 2 and 3
Q.49

Which of the following is a microwave power amplifier?

  • Gunn diode
  • Reflex klystron
  • Magnetron
  • Travelling wave tube
Q.50

A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at s = - 2 and s = -and one simple zero at s = -A unit step u(t) is applied at the input of the system. At steady state, the output has constant value ofThe impulse response of this system is

  • [exp (- 2t) + exp (-4t)] u(t)
  • [-4 exp (- 2t) + 12 exp (-4t) - exp (-t)] u(t)
  • [-4 exp (- 2t) + 12 exp (-4t)] u(t)
  • [-0.5 exp (- 2t) + 1.5 exp (-4t)] u(t)
0 h : 0 m : 1 s