Q.1

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.2

A generator ofΩ internal impedance and operating at 1 GHz feeds aΩ load via a coaxial line of characteristic impedanceΩ. The VSWR on the feed line is

  • 0.5
  • 1.5
  • 2.5
  • 1.75
Q.3

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.4

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.5

For a class B amplifier using a supply of VCC =V and driving a load ofΩ the maximum efficiency will be __________ .

  • 72.4%
  • 78.54%
  • 62.4%
  • 68.54%
Q.6

One of a loss-less transmission line having the characteristic impedance ofΩ and length of 1cm is short-circuit. At 3 GHz, the input impedance at the other end of the transmission line is

  • 0
  • resistive
  • capacitance
  • inductive
Q.7

If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} =then

  • Y = Z
  • Y = Z
  • Z = 1
  • Z = 0
Q.8

A rectangular waveguide of internal dimensions (a = 4 cm and b =is to be operated in TE11 mode. The minimum operating frequency is

  • 6.25 GHz
  • 6.0 GHz
  • 5.0 GHz
  • 3.75 GHz
Q.9

The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T =K, electronic charge = 1.6 x 10-19C, thermal voltage = 26mV and electron mobility =cm2/V-s

The magnitude of the electric field at x = 0.5 μm is

  • 1 kV/cm
  • 5 kV/cm
  • 10 kV/cm
  • 26 kV/cm
Q.10

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t =then

Q.11

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t =then

Q.12

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t =then

Q.13

A transmission line has a characteristic impedance ofΩ and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is

  • 500
  • 5
  • 0.014
  • 0.002
Q.14

An image usesxpicture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy in the above image will be

  • 2097152 bits
  • 786432 bits
  • 648 bits
  • 144 bits
Q.15

AkHz carrier wave modulatedatHz is applied to a resonant circuit tuned to a carrier frequency and having Q =What is the degree of modulation after transmission through this circuit?

  • 0.40
  • 0.20
  • 0.27
  • 0.54
Q.16

AkHz carrier wave modulatedatHz is applied to a resonant circuit tuned to a carrier frequency and having Q =What is the degree of modulation after transmission through this circuit?

  • 0.40
  • 0.20
  • 0.27
  • 0.54
Q.17

AkHz carrier wave modulatedatHz is applied to a resonant circuit tuned to a carrier frequency and having Q =What is the degree of modulation after transmission through this circuit?

  • 0.40
  • 0.20
  • 0.27
  • 0.54
Q.18

An image usesxpicture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy in the above image will be

  • 2097152 bits
  • 648 bits
  • 786432 bits
  • 144 bits
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