Exercise: Communication Systems

Questions for: Communication Systems

If a line is terminated in characteristic impedance Z0, the input impedance measured at the input will be
A:
Z0
B:
Z0/2
C:
Zero
D:
infinite
Answer: A

If line is terminated in Z0, the input impedance is Z0.

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Which of the following microphones is the cheapest?
A:
Moving coil
B:
Condenser
C:
Ribbon
D:
Carbon
Answer: D

Carbon microphone has the least cost.

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In PCM, the biggest disadvantage as compared to AM is
A:
larger bandwidth
B:
larger noise
C:
inability to handle analog signals
D:
incompatibility with time division multiplex systems
Answer: A

PCM requires large bandwidth.

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A high pulse repetition frequency in a radar
A:
increases the maximum range
B:
decreases the maximum range
C:
has no effect on the maximum range
D:
either (a) or (b) depending on other factors
Answer: C

PRF does not have any effect on range of radar.

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The video heads, in VCR, feed the other circuit
A:
directly windings
B:
through a transformer having two rotating windings
C:
through a transformer having two stationary windings
D:
through a transformer having one stationary and one rotatory winding
Answer: D

Rotatory transformer, in VCR, has one stationary and one rotating winding.

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