Exercise: Exam Question Papers

Questions for: Exam Question Papers

Radiation efficiency of an antenna is defined as the ratio of
A:
Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter
B:
The frequency at which minimum power is radiated to the frequency at which maximum power is radiated
C:
Total power accepted from the transmitter to total power generated by the transmitter
D:
Power in main lobe to that in the side lobe
Answer: A
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Following one is moving average system __________ .
A:
B:
C:
D:
Answer: B
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An amplitude modulated signal occupies a frequency range from 395 kHz to 405 kHz. If can be demodulated by which of the following?
A:
Using an envelope detector and filter
B:
Multiplying with a 395 kHz local signal
C:
Multiplying with a 405 kHz local signal
D:
Low pass filtering with cut off at 400 kHz
Answer: D
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A scheme shown below is to generate a wide band FM modulate signal.

Narrow band FM has carrier frequency = 400 KHz
Deviation ratio = 0.2
Wide band FM has carrier frequency = 100 MHz
Deviation ratio = 6
Frequency multiplication factor is:
A:
30
B:
6
C:
250
D:
12
Answer: A
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If a vector field is related to another vector field through which of the following is true? Note: C and Sc refer to any closed contour and any surface whose boundary is C.
A:
B:
C:
D:
Answer: B
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