Question 21 : Which device is used in TV receivers for tuning the receiver to the incoming signal?
1. Varacter diode
2. High pass filter
3. Low pass filter
4. Bandpass filter
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Question 22 : Standard intermediate frequency used for AM receiver is ________
1. 455 MHz
2. 455 KHz
3. 455 Hz
4. 20 KHz
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Question 23 : Aliasing refers to ________
1. Sampling of signals less than at Nyquist rate
2. Sampling of signals at Nyquist rate
3. Sampling of signals greater than at Nyquist rate
4. Unsampled the original signal
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Question 24 : Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%?
1. 100W
2. 800W
3. 500W
4. 900W
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Question 25 : Signal to quantization noise ratio in PCM system depends on _________
1. sampling rate
2. signal bandwidth
3. number of quantization levels
4. bit rate
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Question 26 : What is the carrier power of an un-modulated carrier signal when it is transmitted through an antenna having an impedance of 50? and it produces a current of 5.4A?
1. 1458W
2. 1468W
3. 1478W
4. 1488W
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Question 27 : In pulse transmitter, the ratio of time on to time off is called ________
1. data rate
2. bandwidth
3. duty cycle
4. efficiency
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Question 28 : All the output pulses are at full transmitter power for a strong signal in all of the following except ________
1. PAM
2. PFM
3. PCM
4. PWM
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Question 29 : The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A?
1. 50%
2. 30%
3. 28.5%
4. 23%
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Question 30 : What is the function of RF mixer?
1. Addition of two signals
2. Multiplication of two signals
3. Subtraction of two signals
4. To reduce the amount of noise
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