Exercise: Communication Systems

Questions for: Communication Systems

A Discone antenna is
A:
a combination of disk and cone in close approximity
B:
a combination of disk and cone at λ/4 spacing
C:
a combination of disk and cone far apart
D:
a combination of disk and cone at λ/2 spacing
Answer: A

It is a combination of disc and cone in close approximity.

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A diode detector load consists of 0.01 μF capacitor in parallel with a 5 k ohms resistor. The maximum depth of modulation without diagonal clipping at modulating frequency of 1000 Hz and 10 kHz is
A:
0.76, 0.24
B:
0.95, 0.3
C:
0.24, 076
D:
0.3, 0.95
Answer: B

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In the television system in India, each channel is allowed a bandwidth of
A:
20 MHz
B:
12 MHz
C:
7 MHz
D:
3 MHz
Answer: C

Each channel is allowed a bandwidth of 7 MHz.

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In push pull amplifier, each transistor conducts for
A:
180°
B:
360°
C:
90°
D:
45°
Answer: A

In push pull circuit each transistor conducts for 180° so that complete conduction for 360° occurs. Hence minimum distortion and maximum efficiency.

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An RF carrier of 12 kV at 1 MHz is amplitude modulated by 1 kHz signal having peak value of 6 kV. The modulation pattern is seen on CRO screen. The voltage indicated will be
A:
18 kV
B:
1.001 kV
C:
6 kV
D:
36 kV
Answer: D

Modulation pattern on CRO will show peak to peak value = 2 (12 + 6) = 36 kV.

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