Exercise: Communication Systems

Questions for: Communication Systems

In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by
A:
(2)1/7
B:
(2)1/12
C:
(2)1/6
D:
(2)1/5
Answer: B

Since these are 12 intervals in one octave, hence (2)1/12.

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Which of the following sampling frequencies is considered adequate in voice telephony?
A:
4 kHz
B:
8 kHz
C:
16 kHz
D:
32 kHz
Answer: B

Generally bandwidth of voice telephony is 4 kHz.

Sampling frequency should be twice this value.

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Directive gain is
A:
a power ratio
B:
a voltage ratio
C:
a current ratio
D:
a distance ratio
Answer: A

Directive gain is the ratio of power density radiated in a particular direction by the antenna to the power density that would be radiated by isotropic antenna.

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In an AM wave with m = 1, the carrier is suppressed. The resulting power saving will be
A:
B:
C:
D:
Answer: C

.

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In a CE amplifier connection, the emitter is at ground potential for
A:
AC quantities
B:
DC quantities
C:
all quantities
D:
none of the quantities
Answer: A

XC for ac frequencies is very low and therefore emitter is nearly at ground potential.

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