Q.1

Period of the signal is:

  • 8
  • 1
  • 24
  • 16
Q.2

A silicon wafer hasnm of oxide it and is inserted in a furnace at a temperature above 1000°C for further oxidation in dry oxygen. The oxidation rate

  • is independent of current oxide thickness and temperature
  • is independent of current oxide thickness but depends on temperature
  • slows down as the oxide grows
  • is zero as the existing oxide prevents further oxidation
Q.3

When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .

  • source, sink
  • sink, source
  • positive value, negative value
  • negative value, positive value
Q.4

It is very likely in __________ gate family that when one gate is driving number of gates in __________ , a gate having least voltage for saturation may consume large __________ leaving other gates inoperative and this phenomenon is called __________ .

  • DTL, parallel, current, current - sinking
  • DCTL, parallel, current, current-lagging
  • ECL, series, voltage, voltage-deterioration
  • DCTL, series, current, current-lagging
Q.5

Which of the following does not cause losses in optical fibre cables?

  • Impurities
  • Microbending
  • Attenuation in glass
  • Stepped index operation
Q.6

A function of one of more variables which conveys information on the nature of physical phenomenon is called

  • Noise
  • Interference
  • System
  • Signal
Q.7

Which of the following counters can be used to divide the clock frequency of a microprocessor by 5?

  • 3 bit counter
  • 5 bit counter
  • mod 3 counter
  • mod 5 counter
Q.8

Which of the following introduces mode partition noise?

  • Coaxial line
  • Waveguide
  • Fibre transmission line
  • Both coaxial line and waveguide
Q.9

In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 1019 cm-3?

  • Silicon atoms
  • Holes
  • Dopant atoms
  • Valence electrons
Q.10

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].
Assertion : FETs are more suitable at the input stages compared to BJTs
Reason: A FET has lower output impedance than a BJT.

  • Both [a] and [r] are true and [r] is the correct reason for [a]
  • Both [a] and [r] are true but [r] is not the correct reason for [a]
  • Both [a] and [r] are false
  • Both [a] and [r] are true
Q.11

What are the ultimate purpose of minimizing logic expressions?

  1. To get small size expression.
  2. To reduce the number of variables in the given expression.
  3. To implement the function of the logic expression with least hardware.
  4. To reduce the expression for making it feasible for hardware implementation.
Select the correct answer from the codes given below:
  • 1 only
  • 2 and 3
  • 3 only
  • 3 and 4
Q.12

What is an advantage of an electronic voltmeter over a non-electronic voltmeter?

  • Low power consumption
  • Low input impedance
  • The ability to measure wide ranges of voltages and resistance
  • Large portability
Q.13

Signal flow graph is used to find :

  • stability of the system
  • controllability of the system
  • transfer function of the system
  • poles of the system
Q.14

Consider the following:

  1. Distortion
  2. Gain
  3. Bias stabilization
  4. Sensitivity
  5. Frequency response
Which of these properties of the power amplifier one should concentrate upon while designing a good power amplifier circuit?
  • 1, 2 and 3
  • 1, 3 and 5
  • 2, 3 and 4
  • 4 and 5
Q.15

Poynting vector is associated with

  • flux in magnetic field
  • power flow in electrostatic field
  • current in electrostatic field
  • charge in electrostatic field
Q.16

In the epitaxial diffused method of fabricating integrating circuits the process involved are __________

  1. Epitaxial growth
  2. Diffusion
  3. Silicon diode growth
  4. Vacuum evaporation of aluminium
  5. Photoetching
The correct order is
  • 1 - 2 - 3 - 4 - 5
  • 1 - 3 - 5 - 2 - 4
  • 3 - 1 - 4 - 5 - 2
  • 1 - 3 - 2 - 4 - 5
Q.17

A divide bycounters can be realized by using

  • six mod-13 counters
  • thirteen mod-6 counters
  • one mod 13 counter followed by one mod-6 counter
  • thirteen mod-13 counters
Q.18

Which of the following devices is used in the microprocessors?

  • JFET
  • BJT
  • MOSFET
  • CMOS
Q.19

Radiation efficiency of an antenna is defined as the ratio of

  • Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter
  • The frequency at which minimum power is radiated to the frequency at which maximum power is radiated
  • Total power accepted from the transmitter to total power generated by the transmitter
  • Power in main lobe to that in the side lobe
Q.20

Which of the following circuits come under the class of sequential 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 and 2
  • 1, 2 and 3
  • 3 and 4
  • 4 and 5
Q.21

Foster Seeley discriminator uses a

  • double tuned circuit in which primary and secondary are tuned to different frequencies
  • double tuned circuit in which primary and secondary are tuned to same frequencies
  • single tuned circuit
  • three triodes in series
Q.22

Consider the following statements:
For a square waveguide of cross-sectionxit has been found

  1. At 6 GHz dominant mode will propagate
  2. At 4 GHz only dominant modes and evanescent
  3. AtGHz all the modes and no higher order mode will propagate
  4. At 7 GHz degenerate modes will propagate
Which of the above statements are correct?
  • 1 and 2 only
  • 1, 2 and 4
  • 2 and 3 only
  • 2, 3 and 4
Q.23

The reflection coefficient on am long transmission line has a phase angle of - 150°. If the operating wavelength ism, what will be the number of voltage maxima on the line?

  • 0
  • 3
  • 6
  • 7
Q.24

A function is given f(t) = sin2t + cos2t. Which of the following is true?

  • f has frequency components at 0 and 1/2p Hz
  • f has frequency components at 0 and 1/p Hz
  • f has frequency components at 1/2p and 1/p Hz
  • f has frequency components at 0, l/2p and 1/p Hz
Q.25

Assertion (A): Capacitance of a solid conducting spherical body of radius 'a' is given by 4 pε0a in free space.

Reason (R): Δ x H = jωεE + J.

  • 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.26

Which of the following uses 'transferred electron effect' for production of microwaves?

  • Silicon
  • Germanium
  • Metal-semiconductor junction
  • Gallium Arsenide
Q.27

Which of the following statements is/are true for the diamond structure?

  1. Coordination number is four.
  2. Packing fraction is 0.34
  3. Copper crystallizes into diamond structure
  4. Lattice is FCC.
  • 1 only
  • 1, 2 and 4
  • 2 and 3 only
  • 2, 3 and 4
Q.28

Which one of the following is a trivalent material?

  • Antimony
  • Phosphorus
  • Arsenic
  • Boron
Q.29

For a standard 2nd order system the maximum overshoot isto an unit step input. If the magnitude of the input is doubled, then maximum overshoot and percentage of maximum overshoot is:

  • maximum overshoot doubles and percentage of maximum overshoot is less than double
  • maximum overshoot doubles and percentage of maximum overshoot do not change
  • maximum overshoot remain same and percentage of maximum overshoot is double
  • maximum overshoot more than double and percentage of maximum overshoot is less than double
Q.30

The process of extension of a single-crystal surface by growing a film in such a way that the added atoms form a continuation of the single-crystal structure is called

  • Ion implantation
  • Chemical vapour deposition
  • Electroplating
  • Epitaxy
Q.31

Consider the following statements:
In the case of space wave propagation, the signal strength at the receiver is

  1. Directly proportional to transmitter and receiver heights.
  2. Inversely proportional to distance between transmitter and receiver.
  3. Directly proportional to frequency.
Which of the above statements is/are correct?
  • 1 and 2
  • 1 and 3
  • 2 and 3
  • 3 only
Q.32

Which of the following factors are responsible to design IC logic gates to operated at a fixed supply voltage of 5 volts?

  1. Low heating of IC logic gates
  2. Compatibility with other logic gates
  3. Satisfactory and safe operation
  4. Standardization from IC manufacturing point of view.
Select the correct answer from the codes given below:
  • 1 only
  • 2 only
  • 2 and 3
  • 3 and 4
Q.33

Which of the following measurements can be done using a counter?

  1. Pulse duration
  2. Interval between two pulses
  3. Amplitude of the pulse
  4. Rise time of a pulse
Select the correct answer from the codes given below:
  • 1 and 2
  • 2 and 3
  • 1 and 4
  • 2 and 4
Q.34

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.35

Which of the transistor models is most preferred for the analysis of a transistor circuit both at mid-band and at high frequencies?

  • h-parameter model
  • y-parameter model
  • s-parameter model
  • hybrid-p model
Q.36

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.37

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.38

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.39

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.40

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.41

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.42

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.43

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.44

Which is the dominant mode in rectangular waveguides?

  • TE10
  • TE11
  • TE01
  • TM11
Q.45

Which junction has least junction capacitance?

  • Alloy
  • Grown
  • Diffused
  • Point contact
Q.46

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.47

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.48

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.49

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.50

Which of the following is a circularly polarized antenna?

  • Horn
  • Dipole
  • Helical
  • Pyramidal
0 h : 0 m : 1 s