C:-Interrupt request
D:-Both interrupt request and reset
Correct Answer:- Option-A

Question57:-What is the carrier frequency in an AM wave when its highest frequency component is 850 Hz and the
bandwidth of the signal is 50 Hz ?

A:-80 Hz

B:-695 Hz

C:-625 Hz

D:-825 Hz

Correct Answer:- Option-D

Question58:-A 100 MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 50 KHz, calculate the
modulation index of the FM signal.

A:-100

B:-50

C:-70

D:-90

Correct Answer:- Option-B
Question59:-After passing the FM signal through mixer, what is the change in the frequency deviation A when the
modulating frequency is doubled ?

A:-Becomes 2A

B:-Becomes A/2

2
C:-Becomes A
D:-Remains unchanged
Correct Answer:- Option-D
Question60:-Pre emphasis is done
A:-For boosting of modulating signal voltage
B:-For modulating signals at higher frequencies
C:-In FM before modulation
D:-All of the above
Correct Answer:- Option-D
Question61:-What is the DFT of the four point sequence x(n) = {0, 1, 2, 3} ?
A:-{6, -2 + 2-2, -2-2)}
B:-{6, -2-2), 2, -2+2j}
0-46, -242 -2, 2-2)
D:-{6, -2-2j, -2,-2+2j}
Correct Answer:- Option-C
Question62:-Which kind of polarization is provided by helical antennas ?
A:-Circular
B:-Elliptical
C:-Plane circular
D:-All of the above
Correct Answer:- Option-A
Question63:-Which has same probability of error ?
A:-BPSK and QPSK
B:-BPSK and ASK
C:-BPSK and PAM
D:-BPSK and QAM
Correct Answer:- Option-C
Question64:-In MSK, the difference between the higher and lower frequency is
A:-Same as the bit rate
B:-Four time the bit rate
C:-Twice of the bit rate
D:-Half of the bit rate
Correct Answer:- Option-D
Question65:-The data rate of QPSK is of BPSK.
A:-Thrice
B:-Twice
C:-Four times
D:-Same