Question 31 : Ground wave can be used for communication upto ________
1. 5 KHz
2. 12 KHz
3. 16 KHz
4. 25 KHz
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Question 32 : In a Vidicon camera tube, both sides of the target plate have the coating of Sno₂.
1. True
2. False
3.
4.
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Question 33 : Distance at which a sky wave is received back on earth ________ with angle of incidence.
1. increases
2. decreases
3. can be increase or decrease
4. can neither be increase or decrease
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Question 34 : Thermal noise is a synonym of ________
1. Atmospheric noise
2. shot noise
3. Johnson noise
4. transit time noise
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Question 35 : Atmospheric noise, extraterrestrial noise and man-made noise is part of internal noise in communication.
1. True
2. False
3.
4.
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Question 36 : Image frequency is given by ________
1. f_s + f_i
2. f_s ± f_i
3. f_s + 2f_i
4. f_s ± 2f_i
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Question 37 : In frequency modulation, there is a large increase in noise and hence increase in the signal to noise ratio.
1. True
2. False
3.
4.
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Question 38 : Sampling frequency of a compact disk is about ________
1. 30 KHz
2. 50 KHz
3. 10 KHz
4. 70 KHz
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Question 39 : Helical antenna is mainly used for ________
1. bandwidth calculation
2. production of video signals
3. radio transmission
4. satellite tracking
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Question 40 : The advantage of using mechanical filter in filter system of sideband suppression is good attenuation characteristics.
1. True
2. False
3.
4.
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