| 1 |
Consider a lossless antenna with a directive
gain of +6dB. If 1 mW of power is fed to it the total power radiated
by the antenna will be |
| Options |
| A) 4 mW |
B) 1 mW |
C)
7 mW |
D) 1/4 mW |
|
|
|
| Correct Answer |
A |
|
| 2 |
The bandgap of Silicon at room temperature is |
| Options |
| A) 1.3 eV |
B) 0.7 eV |
| C) 1.1 eV |
D) 1.4 eV |
|
|
|
| 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 |
In a PCM system, if the code word length is
increased from 6 to 8 bits, the signal to quantization noise ratio
improves by the factor
|
| Options |
|
|
|
| Correct Answer |
C |
|
| 5 |
Match the following and choose the correct combination:
| Group 1 |
Group 2 |
E. Newton-Raphson method
F. Runge-kutta method
G. Simpson,s Rule
H. Gauss elimination |
1. Solving nonlinear equations
2. Solving linear simultaneous equations
3. Solving ordinary differential equations
4. Numerical integration
5. Interpolation
6. Calculation of Eigenvalues |
|
| Options |
| A) E-6, F-1, G-5, H-3 |
B) E-1, F-6, G-4, H-3 |
| C) E-1, F-3, G-4, H-2 |
D) E-5, F-3, G-4, H-1 |
|
|
|
| Correct Answer |
C |
|
| 6 |
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 |
|
| 7 |
Match the following and choose the correct combination.
| Group 1 |
Group 2 |
E - continuous and aperiodic signal
F - continuous and periodic signal
G - Discrete and aperiodic signal
H - Discrete and periodic signal |
1 - Fourier representation is continuous and aperiodic
2 - Fourier representation is discrete and aperiodic
3 - Fourier representation is continu-ous and periodic
4 - Fourier representation is discrete and periodic |
|
| Options |
| A) E - 3, F - 2, G - 4, H -1 |
B) E -1, F - 3, G - 2, H - 4 |
| C) E -1, F - 2, G - 3, H - 4 |
D) E - 2, F - 1, G - 4, H - 3 |
|
|
|
| Correct Answer |
C |
|
| 8 |
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 |
|
| 9 |
For the polynomial P(s) = s5 +
s4 + 2s3 + 2s2 + 3s + 15, the
number of roots which lie in the right half of the s-plane is
|
| Options |
|
|
|
| Correct Answer |
B |
|
| 10 |
An AM signal is detected using an envelope
detector The carrier frequency and modulating signal frequency are 1
MHz and 2 kHz respectively. An appropriate value for the time
constant of the envelope detector is
|
| Options |
| A) 500 msec |
B) 20 msec |
| C) 0.2 msec |
D) 1 msec |
|
|
|
| Correct Answer |
B |