Question 1 : Companding is used in PCM transmitters to overcome quantizing noise in PCM.
1. True
2. False
3.
4.
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Question 2 : In PCM system, output S/N increases ________
1. parabolically with bandwidth
2. exponentially with bandwidth
3. inversely with bandwidth
4. linearly with bandwidth
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Question 3 : ________ microphones works on piezoelectric effect?
1. Crystal
2. Carbon
3. Moving coil
4. Condenser
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Question 4 : If modulation index of an AM was in changed from 0 to 1, then transmitted power ________
1. increases by 100%
2. increases by 50%
3. increases by 75%
4. increases by 25%
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Question 5 : In higher power AM transmission, modulation is done at _________
1. Source stage
2. Transducer Stage
3. Oscillator stage
4. RF power stage
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Question 6 : A 1000 KHz carrier is modulated with 300 Hz, 8000 Hz and 2 KHz waves. Determine the frequencies whose chances of occurring in output is least?
1. 1000 KHz
2. 1002 KHz
3. 998 KHz
4. 999.2 KHz
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Question 7 : IF stage is a receiver exploys ________
1. impedance coupling
2. capacitive coupling
3. single tuned transformer coupling
4. double tuned transformer coupling
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Question 8 : Which of the following statement is true about pulse position modulation system?
1. pulses have constant width but varying amplitude
2. pulses have constant amplitudes and constant widths
3. pulses have constant amplitude but varying widths
4. pulses have varying width and varying amplitude
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Question 9 : What is the expected modulation index in case of narrow band FM?
1. less than or equal to 1
2. infinite
3. 1.5
4. more than 1
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Question 10 : What is the expected modulation index in case of wide band FM?
1. less than 1
2. 1
3. ¹⁄₂
4. more than 1
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