| 1 |
The phase velocity of an electromagnetic wave
propagating in a hollow metallic rectangular waveguide in the TE10
mode is |
| Options |
| A) equal to its group velocity |
B) less than the velocity of light in free space |
| C) equal to the velocity of light in free space |
D) greater than the velocity of light in free space |
|
|
|
| Correct Answer |
D |
|
| 2 |
A device with input x(t) and output y(t) is
characterized by: y(t) = x2(t).
An FM signal with frequency deviation of 90 kHz and modulating
signal bandwidth of 5 kHz is applied to this device. The bandwidth
of the output signal is
|
| Options |
| A) 370 kHz |
B) 190 kHz |
| C) 380kHz |
D) 95kHz |
|
|
|
| Correct Answer |
C |
|
| 3 |
For a signal x(t) the fourier transform is X(f).
Then the inverse Fourier transform of X(3f + 2) is given by |
| Options |
| A)
x(
)e(j3p t) |
B)
x(
)e-j4pt/3 |
| C) 3x(3t)e-j4p t |
D) x(3t+2) |
|
|
|
| Correct Answer |
B |
|
| 4 |
The Fourier transform of a conjugate symmetric
function is always
|
| Options |
| A) imaginary |
B) conjugate anti-symmetric
|
| C) real |
D) conjugate symmetric |
|
|
|
| Correct Answer |
C |
|
| 5 |
A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec
and the sampled signal is passed through an, ideal low-pass filter
with cut-off frequency 800 Hz.
The output signal has the frequency
|
| Options |
| A) zero Hz |
B) 0.75 kHz |
| C) 0.5 kHz |
D) 0.25 kHz |
|
|
|
| Correct Answer |
C |
|
| 6 |
An ideal op-amp is an ideal
|
| Options |
| A) voltage controlled current source |
B) voltage controlled voltage source
|
| C) current controlled current source |
D) current controlled voltage source
|
|
|
|
| Correct Answer |
B |
|
| 7 |
A Boolean function f of two variables x and y
is defined as follows:
f(0,0) = f(0,1) = f(1, 1) = 1; f(1,0) = 0
Assuming complements of x and y are not available, a minimum cost
solution for realizing fusing only 2-input NOR gates and 2-input OR
gates (each having unit cost) would have a total cost of |
| Options |
| A) 1 unit |
B) 4 unit |
| C) 3 unit |
D) 2 unit |
|
|
|
| Correct Answer |
D |
|
| 8 |
The impulse response h[n] of a linear time-invariant system is
given by
h[n] = u[n + 3] + u[n - 2] - 2u[n-7]
where u[n] is the unit step sequence. The above system is
|
| Options |
| A) stable but not causal |
B) stable and causal |
| C) causal but unstable |
D) unstable and not causal |
|
|
|
| Correct Answer |
A |
|
| 9 |
The cascade amplifier is a multistage
configuration of |
| Options |
| A) CC-CB |
B) CE-CB |
| C) CB-CC |
D) CE-CC |
|
|
|
| Correct Answer |
B |
|
| 10 |
A 1 mW video signal having a bandwidth of 100
MHz is transmitted to a receiver through a cable that has 40 dB
loss. If the effective one-sided noise spectral density at the
receiver is 10-20 Watt/Hz, then the signal-to-noise ratio
at the receiver is |
| Options |
| A) 50 dB |
B) 30 dB |
| C) 40 dB |
D) 60dB |
|
|
|
| Correct Answer |
A |