Analog Communications Practice Test 1

1. What is the role of channel in communication system?

converts one form of signal to other

helps to extract original signal from incoming signal

allows mixing of signals

acts as a medium to send message signals from transmitter to receiver

2. Noise performance of a square law demodulator of AM signal is?

Weaker than that of synchronous detector

Better than that of synchronous detector

Better than that of envelope detector

Weaker than that of envelope detector

3. Ring Modulator is ________

used for SSB-SC generation

used for VSB generation

used for AM generation

used for DSB-SC generation

4. For getting 100% modulation, carrier amplitude should ________

be equal to signal amplitude

be lesser than signal amplitude

exceed signal amplitude

be equal to 0

5. Demodulation is done in ________

Receiving antenna

Channel

Transducer

Receiver

6. Process of recovering information signal from received carrier is known as ________

Demodulation

Sensitivity

Fidelity

Selectivity

7. What is Amplitude Modulation?

Change in amplitude of modulating signal according to carrier signal amplitude

Change in amplitude of carrier according to modulating signal frequency

Change in frequency of carrier according to modulating signal amplitude

Change in amplitude of carrier according to modulating signal amplitude

8. Sin wave is ________

Deterministic Signal

Aperiodic Signal

Periodic Signal

Random Signal

9. What is the role of the transmitter in the communication system?

to produce radio waves to transmit data

to convert one form of energy into other

to decode a signal to be transmitted

to detect and amplify information signal from the carrier

10. Overmodulation results in ________________

Weakens signal

Distortion

provides immunity to noise

Strengthens the signal