Exercise: Communication Systems

Questions for: Communication Systems

In a system using QASK and 4 bits to form a symbol, the required bandwidth is
A:
same as BPSK
B:
half of that in BPSK
C:
one-fourth of that in BPSK
D:
none of the above
Answer: C
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Which of the following codes is based on BCD format?
A:
EBCDIC
B:
ASCII
C:
Hollerith
D:
both (a) and (b)
Answer: D
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An antenna is 30 metre high. The frequency is 1 MHz. The radiation resistance is about
A:
1500 Ω
B:
150 Ω
C:
15 Ω
D:
1.5 Ω
Answer: C
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In the stabilized reactance modulators AFC system
A:
the discriminator must have a fast time constant to prevent demodulation
B:
the higher discriminator frequency the better the oscillator frequency stability
C:
the discriminator frequency must not be too low, or the system will fail
D:
phase modulation is converted into FM by the equalizer circuit
Answer: D
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CW Doppler radar is capable of giving accurate measurements of relative velocities.
A:
True
B:
False
C:
D:
Answer: A
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