1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# An AM signal and a narrow-band FM signal with identical carriers, modulating signals and modulation  indices  of  0.1  are  added  together.  The  resultant  signal  can  be  closely approximated by

2.  SSB with carrier

3.    DSB-SC

4.  SSB without carrier

4

SSB with carrier

Explanation :
No Explanation available for this question

# In  the  output  of  a DM  speech  encoder,  the  consecutive  pulses  are  of  opposite  polarity during time interval t1 ≤ t ≤ t2.This indicates that during this interval

1.  the input to the modulator is essentially constant

2.    the modulator is going through slope overload

3.  the accumulator is in saturation

4.  the speech signal is being sampled at the Nyquist rate

4

the input to the modulator is essentially constant

Explanation :
No Explanation available for this question

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The  phase  velocity  of  an  electromagnetic  wave  propagating  in  a  hallow  metallic rectangular waveguide in the TE10 mode is

1.  equal to its group velocity

2.  less than the velocity of light in free space

3.  equal to the velocity of light in free space

4.  greater than the velocity of light in free space

4

greater than the velocity of light in free space

Explanation :
No Explanation available for this question

# A 100 MHz carrier of 1 V amplitude and a 1 MHz modulating signal of 1 V amplitude are fed to a balanced modulator. The output of the modulator is passed through an ideal high-pass  filter with  cut-off  frequency  of  100 MHz.  The  output  of  the  filter  is  added with  100 MHz signals of 1 V amplitude and 90° phase shift as shown in Figure. The envelope of the resultant signal is

1.   1)  Constant 3)       4

2.  √5/4+sin(2πX106 t)

3.  √5/4-sin(2πX106 t)

4.  √5/4+cos(2πX106 t)

4

√5/4-sin(2πX106 t)

Explanation :
No Explanation available for this question

# 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

1.  4 mW

2.  1 mW

3.  7 mW

4.  (1/4) mW

4

4 mW

Explanation :
No Explanation available for this question

# A system described by the following differential equation (d2y/dt2) + 3(dy/dt) + 2y = x(t)  is initially at rest. For input x(t) = 2u(t), the output y(t) is

1.  (1 - 2e-t + e-2t) u (t)

2.    (1 + 2e-t - e-2t) u (t)

3.  (0.5 + e-t+ 1.5e-2t) u (t)

4.  (0.5 + 2e-t+ 2e-2t) u (t)

4

(1 - 2e-t + e-2t) u (t)

Explanation :
No Explanation available for this question

# Choose the correct one from among the alternative A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2   Group 1   Group 2 1 FM P. Slope overload 2 DM Q. μ-law 3 PSK R. Envelop Detector 4 PCM S. Capture effect     T. Hilbert transform     U. Matched filter

1.  1-T, 2-P, 3-U, 4-S

2.  1-S, 2-U, 3-P, 4-T

3.  1-S, 2-P, 3-U, 4-Q

4.  1-U, 2-R, 3-S, 4-Q

4

1-S, 2-P, 3-U, 4-Q

Explanation :
No Explanation available for this question

# Consider the following statements S1 and S2 S1:  At the resonant frequency the impedance of a series R-L-C circuit is zero. S2:    In a parallel G-L-C circuit,  increasing  the conductance G  results  in  increase  in  its Qfactor. Which one of the following is correct

1.  S1 is FALSE and S2 is TRUE

2.  both S1 and S2 are TRUE

3.  S1 is TRUE and S2 is FALSE

4.  both S1 and S2 are FALSE

4