Q.1

8416 - 2A16 is equal to

  • 5A16
  • 4A16
  • 7A16
  • 15A16
Q.2

When number of quantization levels are two; then the average transmission power in NRZ polar signaling is __________ that of NRZ unipolar signaling

  • 1/2
  • 1/4
  • 1/8
  • none of these
Q.3

For a message signal m(t) = cos (2pfmt) and the carrier frequency fc, which of the following represents a single side band (SSB) signal?

  • cos (2pfmt) cos (2pfct)
  • cos (2pfct)
  • cos [2p(fc + fm) t]
  • [1 + cos (2pfmt) cos (2pfct)]
Q.4

Six sets of electromagnetic waves are given below :
-KHz
-KHz
3 -MHz
-KHz
-MHz
>MHz
There are designated in the following order

  • VLF, LF, MF, HF, VHF, UHF
  • LF, VLF, MF, HF, VHF, VHF
  • LF, VLF, HF, MF, VHF, UHF
  • VHF, VLF, HF, MF, LF, UHF
Q.5

If RT, Rh represent condition for reciprocity in case of transmission parameter and hybrid parameter respectively and similarly ST, Sh represent condition for symmetry in case of transmission parameter and hybrid parameter respectively then match the following :
(RT (a) A = D
(Rh (b) h12 = h21
(ST (c) AD - BC = 1
(Sh (d) h12 = - h21
(e) B = c
(f) Δh = 1

  • 1 - c 2 - d 3 - a 4 - f
  • 1 - c 2 - b 3 - e 4 - d
  • 1 - e 2 - d 3 - a 4 - b
  • 1 - e 2 - d 3 - a 4 - f
Q.6

Consider the following statements:
For a master-slave J-K flip-flop,

  1. the toggle frequency is the maximum clock frequency at which the flip-flop will toggle reliably.
  2. the data input must precede the clock triggering edge transition time by time minimum time.
  3. the data input must remain fixed for a given time after, the clock triggering edge transition time for reliable operation.
  4. propagation delay time is equal to the rise time and fall time of the data.
Which of the above statements is/are correct?
  • 1, 2 and 3
  • 1 and 2 only
  • 2 and 3 only
  • 3 and 4 only
Q.7

A series R-C circuit with R = 3 Ω and XC = 4 Ω atHz is supplied with a voltage V =+ 141.4 sint. What is the RMS value of the current flowing through the circuit?

  • 5 A
  • 10 A
  • 20 A
  • 22-36 A
Q.8

Gain of the circuit shown below is:

  • 3
    15-03-27-2.png
    15-03-27-3.png
  • -1
Q.9

Assertion (A): The expression E = - ΔV, where E is the electric field and V is the potential is not valid for time varying fields.

Reason (R): The curl of a gradient is identically zero.

  • 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.10

A single mode fibre not suffer from which type of dispersion?

  • Waveguide dispersion
  • Material dispersion
  • Intermodal dispersion
  • Polarization mode dispersion
Q.11

Which one of the following is not LED material?

  • GaAs
  • GaP
  • SiC
  • SiO2
Q.12

A standard waveguide W Rhas inside wall dimensions of a = 2.cm and b = 1.cm. What is the cut-off wavelength for TE01 mode?

  • 4.572 cm
  • 2.286 cm
  • 2.032 cm
  • 1.857 cm
Q.13

Which of the following meters cannot measure a.c. quantities?

  • Thermocouple
  • Hot wire
  • P.M.M.C.
  • Electrodynamometer.
Q.14

Calculate the electrostatic force of repulsion between two mica particles at a distance of 10-13 m from each other. Charge on a particle is 3.2 x 10-19 C. (relative permittivity for mica is 5)

  • 1.843 x 10-15 N
  • 9.2 x 10-2 N
  • 14.41 x 10-9 N
  • none of these
Q.15

A ring counter with 5 flip-flops will have __________ states.

  • 5
  • 10
  • 32
  • Infinite
Q.16

A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain ofWhat is the output voltage?

  • 1.0 V
  • 1.5 V
  • 2.0 V
  • 2.5 V
Q.17

There are four different algorithms AAA3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?

  • A1
  • A2
  • A3
  • A4
Q.18

The amplitude of a random signal uniformly distributed between - 5 V and 5 V
If the signal to quantization noise ratio required in uniformly quantizing the signal is 4.5dB, the step size of the quantization is approximately

  • 0.0333 V
  • 0.05 V
  • 0.0667 V
  • 0.10 V
Q.19

Consider the following statements:
The conductivity of a metal has negative temperature coefficient since:

  1. The electron concentration increases with temperature.
  2. The electron mobility decreases with temperature.
  3. The electron-lattice scattering rate increases with temperature.
Which of the above statements is/are correct?
  • 1 only
  • 1 and 2
  • 2 and 3
  • 3 only
Q.20

AtGHz , the gain of a parabolic dish antenna of 1 meter diameter andefficiency is

  • 15 dB
  • 25 dB
  • 35 dB
  • 45 dB
Q.21

Which of the following statements is/are true for a good conductor of electricity?

  1. Its conductivity decreases with increasing temperature.
  2. Number of free electrons is around 1028 m-3.
  3. Its conductivity decreases with addition of impurities.
  4. It is a good conductor of heat also.
  • 1, 2, 3 and 4
  • 1 only
  • 2 and 3 only
  • 3 and 4 only
Q.22

Consider the following statements:

  1. A flip-flop is used to store 1-bit of information.
  2. Race-around condition occurs in a J-K flip-flop when both the inputs are 1.
  3. Master-slave configuration is used in flip-flops to store 2-bits of information
  4. A transparent latch consists of a D-type flip-flop.
Which of the above statements is/are correct?
  • 1 only
  • 1, 3 and 4
  • 1, 2 and 4
  • 2 and 3 only
Q.23

An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8
where K is the forward gain of the system. The condition for closed loop stability is

  • K = 0.528
  • K = 2
  • K = 0
  • K = -2528
Q.24

Which of the following addressing modes is used in the instruction PUSH B?

  • Direct
  • Register
  • Register Indirect
  • Immediate
Q.25

Assertion (A): It is not desirable to drive a transistor into hard saturation in high speed switching circuits.

Reason (R): It may not be possible to bring it back to cutoff state, if it is driven into hard saturation.

  • 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

In Quine-Mclusky method of Boolean function reduction; __________ , are treated as __________ and therefore discrepancies may occur in the final solution, therefore this method is not applicable to the functions with __________ .

  • zeros, don't care conditions, zeros
  • one's, don't care conditions, one's
  • don't care conditions, zeros, don't care conditions
  • don't care conditions, don't care conditions, don't care conditions
Q.27

In TV transmission the modulation schemes for video and audio are respectively

  • FM and AM
  • FM and FM
  • AM and FM
  • AM and AM
Q.28

Assertion (A): A rectifier with inductor filter is more efficient for high load current.

Reason (R): In rectifier with inductor filter we can use a larger choke to reduce ripple, larger choke will have higher dc resistance which will result in lower dc output voltage for higher load current.

  • 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.29

The eigen values of the following matrix are

  • 3, 3 + 5j, 5 -j
  • - 6 + 5j, 3 + j, 3 - j
  • 3 + j, 3 - j, 5 + j
  • 3, - 1 + 3j, - 1 - 3j
Q.30

Hysteresis loss in a transformer working atV and at a frequency ofHz isW. When the transformer is operated atV and at a frequency ofHz, what is the hysteresis loss?

  • 50 W
  • 100 W
  • 200 W
  • 400 W
Q.31

How can the bandwidth of a control system be increased?

  • By the use of phase lead network
  • By the use of phase lag network
  • By the use of both phase-lag and phase-lead network
  • By the use of cascaded amplifiers in the system
Q.32

A standard waveguide W Rhas inside wall dimensions of a = 2.cm and b = 1.cm. What is the cut-off wavelength for TE01 mode?

  • 4.572 cm
  • 2.286 cm
  • 2.032 cm
  • 1.857 cm
Q.33

A balanced modulator is used in the generation of which of the following?

  • DSB-SC signal
  • FM signal
  • PM signal
  • PAM signal
Q.34

What is the major cause of creeping in an energy-meter?

  • Over compensation for friction
  • Mechanical vibrations
  • Excessive voltage across the potential coil
  • Stray magnetic fields
Q.35

What is the propagation constant for air filled wave guide with dimensions a = 1.and b = 0.at 4.GHz. The wave impedance is

  • 400.94 Ω
  • 562.94 Ω
  • 502.80 Ω
  • 492.80 Ω
Q.36

Consider a silicon p-n junction at room temperature having the following parameters:
Doping on the n-side = 1 x 1017 cm-3
Depletion width on the n-side = 0.1 μm
Depletion width on the p-side = 1.0 μm
Intrinsic carrier concentration = 1.4 x 1014F. cm-1.
Thermal voltage = 26mV
Permittivity of free space = 8.x 10-14F. cm-1.
Dielectric constant of silicon =The peak electric field in the device is

  • 0.15 MV.com-1, directed from p-region to n-region
  • 0.15 MV.com-1, directed from n-region to p-region
  • 1.80 MV.com-1, directed from p-region to n-region
  • 1.80 MV.com-1, directed from n-region to p-region
Q.37

For an N-point FFT algorithm with N = 2m which one of the following statements is TRUE?

  • It is not possible to construct a signal flow graph with both input and output in normal order
  • The number of butterflies in the mth stage is N/m
  • In-place computation requires storage of only 2N node data
  • Computation of a butterfly requires only one complex multiplication
Q.38

The Table given below is the mark obtained by 2 students in 8 different subjects.

The regression line of y on x is:

  • y + 0.57x = 9.7558
  • y - 0.57x = 9.758
  • 033y + x = 6.335
  • 0.33y - x = 6.335
Q.39

A balanced modulator is used in the generation of which of the following?

  • DSB-SC signal
  • FM signal
  • PM signal
  • PAM signal
Q.40

What is the major cause of creeping in an energy-meter?

  • Over compensation for friction
  • Mechanical vibrations
  • Excessive voltage across the potential coil
  • Stray magnetic fields
Q.41

A single turn loop is situated in air, with a uniform magnetic field normal to its plane. The area of the loop is 5 m2 and the rate of change of flux density is 2 Wb/m2/s. What is the emf appearing at the terminals of the loop?

  • -5 V
  • -2 V
  • -0.4 V
  • 0 V
Q.42

What is the address space ofCPU?

  • One Megabyte
  • 256 Kilobytes
  • 1 K Megabytes
  • 64 Kilobytes
Q.43

What is the period of the sinusoidal signal x(n) = 5 cos [0.2 pn]?

  • 10
  • 5
  • 1
  • 0
Q.44

A signal x1(t) and x2(t) constitute the real and imaginary parts respectively of a complex valued signal x(t). What form of waveform does x(t) possess?

  • Real symmetric
  • Complex symmetric
  • Asymmetric
  • Conjugate symmetric
Q.45

Which among the following waveforms can be reconstructed from its samples without distortion?

  • 1 and 2
  • 2 and 3
  • 1 and 3
  • Only 2
Q.46

The ratio of the diffusion coefficient in a semiconductor has the units

  • V-1
  • em.V-1
  • V.cm-1
  • V.s
Q.47

In Quine-Mclusky method of Boolean function reduction; __________ , are treated as __________ and therefore discrepancies may occur in the final solution, therefore this method is not applicable to the functions with __________ .

  • zeros, don't care conditions, zeros
  • one's, don't care conditions, one's
  • don't care conditions, zeros, don't care conditions
  • don't care conditions, don't care conditions, don't care conditions
Q.48

In TV transmission the modulation schemes for video and audio are respectively

  • FM and AM
  • FM and FM
  • AM and FM
  • AM and AM
Q.49

A balanced modulator is used in the generation of which of the following?

  • DSB-SC signal
  • FM signal
  • PM signal
  • PAM signal
Q.50

What is the address space ofCPU?

  • One Megabyte
  • 256 Kilobytes
  • 1 K Megabytes
  • 64 Kilobytes
0 h : 0 m : 1 s