Q.1

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.2

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

  • DSB-SC signal
  • FM signal
  • PM signal
  • PAM signal
Q.3

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.4

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.5

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.6

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.7

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.8

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

  • DSB-SC signal
  • FM signal
  • PM signal
  • PAM signal
Q.9

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.10

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.11

What is the address space ofCPU?

  • One Megabyte
  • 256 Kilobytes
  • 1 K Megabytes
  • 64 Kilobytes
Q.12

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

  • 10
  • 5
  • 1
  • 0
Q.13

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.14

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.15

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

  • V-1
  • em.V-1
  • V.cm-1
  • V.s
Q.16

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.17

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.18

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

  • DSB-SC signal
  • FM signal
  • PM signal
  • PAM signal
Q.19

What is the address space ofCPU?

  • One Megabyte
  • 256 Kilobytes
  • 1 K Megabytes
  • 64 Kilobytes
Q.20

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.21

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.22

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.23

Consider differential equation with the initial condition y(=Using Euler's first order method with a step size of 0.the value of y(0.is

  • 0.01
  • 0.031
  • 0.0631
  • 0.1
Q.24

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.25

Consider differential equation with the initial condition y(=Using Euler's first order method with a step size of 0.the value of y(0.is

  • 0.01
  • 0.031
  • 0.0631
  • 0.1
Q.26

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.27

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.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

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

  • 10
  • 5
  • 1
  • 0
Q.30

Consider differential equation with the initial condition y(=Using Euler's first order method with a step size of 0.the value of y(0.is

  • 0.01
  • 0.031
  • 0.0631
  • 0.1
Q.31

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

  • 10
  • 5
  • 1
  • 0
Q.32

The output corresponding to the figure shown below is :

Q.33

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.34

An antenna array comprises of two dipoles that are separated by wavelength. The dipoles are fed by currents of the same magnitude andin phase. The array factor is:

  • 2 cos - 2 sin
  • 2 cos + 2 sin
  • 2 cos
  • 2 sin
Q.35

The output corresponding to the figure shown below is :

Q.36

Consider the following

  1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
  2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.
  • (1) is true and (2) is false
  • (1) and (2) both are true
  • (1) is false and (2) is true
  • (1) and (2) both are false
Q.37

Radiation resistance of an antenna isΩ and loss resistance is 6 Ω. If antenna has power gain ofthen directivity is:

  • 9
  • 11.11
  • data not sufficient
  • 10
Q.38

When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively

  • Increased, Increased, Increased
  • Increased, Increased, Decreased
  • Increased, Decreased, Decreased
  • Decreased, Decreased, Decreased
Q.39

The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

  • 9.19 A
  • 9.91 A
  • 10.56 A
  • 8.61 A
Q.40

The equivalent form of the logical expression ABC + A BC + ABC + ABC + AB C is

  • C + (A ⊕ B)
  • (A + B + C)(A + B + C)
  • (A + B + C)(A + B + C)(A + B + C)
  • (A + B + C)(A + B + C)(A + B + C)
Q.41

The gradient of any scalar field always yields __________ .

  • a solenoidal field
  • a conservative field
  • an irrotational field
  • none of these
Q.42

The specific gravity of tungsten is 13.8 and its atomic weight is 184.0 Assume that there are two free elements per atom. Then the Fermi level or characteristic energy for the crystal in eV will be

  • 8.95 eV
  • -8.95 eV
  • 7.326 eV
  • -7.326 eV
Q.43

For a given voltage, four heating coils will produce maximum heat when connected

  • all in parallel
  • all in series
  • with two parallel pairs in series
  • one pair in parallel with the other two in series
Q.44

What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

  • 2 kV, 0.5 kV
  • 1 kV, 0.5 kV
  • 0.75 kV, 0.25 kV
  • 0.5 kV, 1.5 kV
Q.45

The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .

  • 300 Hz
  • 360 Hz
  • 600 Hz
  • 480 Hz
Q.46

Consider the amplitude modulated (AM) signal Ac cos ωct + 2 cos ωmt cos ωct For demodulating the signal using envelope detector, the minimum value of Ac should be

  • 2
  • 1
  • 0.5
  • 0
Q.47

A noiseless 3 KHz channel can transmit binary at the rate __________ .

  • 12000 bps
  • 10000 bps
  • 6000 bps
  • 3000 bps
Q.48

In a flash type ADC, employingcomparators resolution withvolts reference; is expected to be :

  • 0.625 V
  • 0.656 V
  • 0.525 V
  • insufficient data
Q.49

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is

  • 1.5 x 108 m/s
  • 5.5 x 108 m/s
  • 3.46 x 108 m/s
  • 0.18 x 107 m/s
Q.50

Denominator polynomial of a transfer function of certain network is:
s3 + s2 + 2s +
Then the network is:

  • stable
  • oscillatory
  • unstable
  • depends on numerator polynomial
0 h : 0 m : 1 s