Exercise: Communication Systems

Questions for: Communication Systems

An angle modulated signal is expressed by fa(t) = cos (2 x 108 pt) + 75 sin (2 x 103 pt). The peak frequency deviation of the carrier is
A:
1 kHz
B:
7.5 kHz
C:
75 kHz
D:
100 MHz
Answer: C
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In a low level AM system, the modulated amplifiers stage must be
A:
harmonic devices
B:
non-linear devices
C:
class C amplifier
D:
linear devices
Answer: D
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Point out the false statement
A:
impulse noise voltage does not depend on bandwidth
B:
thermal noise is independent of frequency at which it is measured
C:
industrial noise is mostly of impulse type
D:
space noise is observable at frequencies in the range of 8 MHz and higher
Answer: A
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The device most likely to be found in an SSB transmitter is
A:
class C audio amplifier
B:
tuned modulator
C:
class B RF amplifier
D:
class A RF amplifier
Answer: C
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In case of a low level AM transmitter, the amplifier modulated stage must be
A:
class A
B:
class B
C:
class B (linear)
D:
class C
Answer: C
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