The auto correlation function Rx(t) is

1.  2NBsin(2πβt)

2.   πNBsin(2πβt)

3.   NBsin(2πβt)

4.   None of these

View Answer  
4
Correct Answer :

NBsin(2πβt)


Explanation :
No Explanation available for this question

Power Px is

1.  2NB

2.  πNB

3.  NB

4.  NB/2π

View Answer  
4
Correct Answer :

NB


Explanation :
No Explanation available for this question

If USSB is employed, bandwidth of the modulated signal is

1.  5 kHz

2.  20 kHz, 10 kHz

3.  20 kHz

4.   none of these

View Answer  
4
Correct Answer :

none of these


Explanation :
No Explanation available for this question

If DSB is employed, then bandwidth of the modulated signal is

1.  5kHz

2.  10 kHz

3.  20 kHz

4.  none of these

View Answer  
4
Correct Answer :

20 kHz


Explanation :
No Explanation available for this question

A message signal is periodic with period ‘t’ as shown in the figure. This message signal is applied to an AM modulator with modulation index β=0.4. The modulation efficiency would be

1.  51%

2.  11.8%

3.  5.1%

4.  none of these

View Answer  
4
Correct Answer :

5.1\%


Explanation :
No Explanation available for this question

Modulation index is

1.  0.5

2.   0.6

3.   0.4

4.  0.8

View Answer  
4
Correct Answer :

0.5


Explanation :
No Explanation available for this question

Modulation efficiency is

1.  8.3%

2.  12.3%

3.   7.7%

4.   none of these

View Answer  
4
Correct Answer :

7.7\%


Explanation :
No Explanation available for this question

In the circuit shown in the figure between terminals 1 and 2, an a.c voltage source of frequency 400Hz is connected. Another a. voltage of 1.0 MHz connected between 3 and 4.The output between 5 and 6 contains components at

1.  400 Hz, 1M., 1000.4 kHz, 999.6 kHz

2.  1 MHz, 1000.4 k., 999.6 kHz

3.   400 1000.4 kHz, 999.6 kHz

4.  1000.4 kHz, 999.6 kHz

View Answer  
4
Correct Answer :

1000.4 kHz, 999.6 kHz


Explanation :
No Explanation available for this question

Let x(t) be a signal band-limited to 1kHz. Amplitude modulation is performed to produce signal g(t)=x(t) sin 2000 πt. A proposed, demodulation technique is shown in the figure. The ideal low pass filter has cut-off frequency 1 kHz and pass band gain 2. The y(t)would be

1.  2y(t)

2.  Y(t)

3.  Y(t)/2

4.   0

View Answer  
4
Correct Answer :

0


Explanation :
No Explanation available for this question

It is required to transmit the signal x(t)=sin 200 πt+2sin 400πt.using a modulation that create the signal (t)=x(t)sin400πt. If product g(t)sin 400πt is pass band gain of 2 then signal obtained at the output of the LPF is

1.  sin 200πt

2.  1/2sin 200πt

3.   2 sin200πt

4.   0

View Answer  
4
Correct Answer :

sin 200πt


Explanation :
No Explanation available for this question
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