24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is

A)
8 kHz
B)
21 kHz
C)
27 kHz
D)
72 kHz

Correct Answer : Option (D) :   72 kHz

Explanation : Since SSB modulation is used, bandwidth = 24 x 3 = 72 kHz.

Recently Updated in Communication Systems Questions
In TV scanning sequence of lines is
A)
right to left
B)
left to right
C)
left to right for odd fields and right to left for even field
D)
left to right for even fields and right to left for odd field

Correct Answer :   left to right

Which of the following terms are applicable to troposcatter propagation?
A)
SIOs
B)
Fading
C)
Faradays rotation
D)
Atmospheric storms

Correct Answer :   Fading

Explanation : Tropospheric scatter propagation is subject to two types of fading called Rayleigh fading (due to multipath propagation) and fading due to variations in atmospheric conditions along the propagation path.

A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about
A)
1.3 mm
B)
130 mm
C)
13 mm
D)
None of the above

Correct Answer :   13 mm

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