Exercise: Communication Systems

Questions for: Communication Systems

In a perfect conductor the resistor noise is
A:
maximum
B:
zero
C:
very high
D:
almost infinite
Answer: B

A perfect conductor does not generate noise.

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PAM stands for
A:
Phase Angle Modulation
B:
Phase Amplitude Modulation
C:
Pulse Amplitude Modulation
D:
Pulse Angle Modulation
Answer: C

PAM or pulse amplitude modulation is a system in which signal is sampled at regular intervals and each sample is made proportional to amplitude of the signal at the instant of sampling.

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The simplest mixer circuit for public address system uses
A:
fixed resistances
B:
variable resistances
C:
inductances
D:
capacitances
Answer: B

A mixer circuit has variable resistance in series with each microphone to control intensity of sound.

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For maximum output the width of air gap of audio head should be
A:
equal to wavelength
B:
half the wavelength
C:
one quarter the wavelength
D:
very small as compared to wavelength
Answer: B

When width of air gap is 0.5 1, output is maximum.

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An MTI radar operating at 5 GHz has a PRF of 800 pps. The lowest blind speed is
A:
48 m/s
B:
96 m/s
C:
192 m/s
D:
24 m/s
Answer: A

Lowest blind speed = 800 x 0.06 = 48 m/s.

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