Question 41 : In India, the subcarrier frequency for transmission of color difference signals in television is approximately ________
1. 10.47 MHZ
2. 5.4 MHZ
3. 7.67 MHZ
4. 1.3 MHZ
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Question 42 : In frequency modulation, there is a large increase in noise and hence decrease in the signal to noise ratio.
1. True
2. False
3.
4.
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Question 43 : Thermal noise shot noise and transit time noise is part of internal noise in communication.
1. True
2. False
3.
4.
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Question 44 : Autocorrelation function of which noise is a constant?
1. white noise
2. shot noise
3. transit time noise
4. extraterrestrial noise
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Question 45 : In a Vidicon camera tube, the side of target plate facing the light has a coating of antimony trisulphide and the side facing electron gun has a coating of tin oxide.
1. True
2. False
3.
4.
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Question 46 : For a large amount of power, a push pull amplifier is designed for operation as ________
1. class C
2. class B
3. class AB
4. class A
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Question 47 : For signal, m(t) = 50cos(10 × 90t + 30 sin100t), the power dissipated by the 20O resistor is ________
1. 100W
2. 65W
3. 74.7W
4. 62.5W
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Question 48 : What is the bandwidth of a FM wave when maximum allowed deviation is 50KHz and the modulating signal has a frequency of 15KHz?
1. 130 KHz
2. 260 KHz
3. 65 KHz
4. 50 KHz
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Question 49 : A superheterodyne receiver receives signal within frequency range of 120 to 180 MHz. Then the required Intermediate frequency is _________
1. 30MHz
2. 60MHz
3. 90MHz
4. 50MHz
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Question 50 : Consider an AM broadcast station which transmits modulating frequencies up to 10kHz. If it transmits a frequency of 1000 kHz. Find its maximum and minimum upper and lower sidebands frequencies and also the total bandwidth?
1. 900 KHz, 820 KHz, 1000 Hz
2. 720 KHz, 650 KHz, 1020 Hz
3. 1010 KHz, 880 KHz, 15000 Hz
4. 1010 KHz, 990 KHz, 20000 Hz
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