1. The process of separating the original information or signal from the modulated carrier.
(A) De-multiplexing
(B) Demodulation
(C) Degeneration
(D) Decoder
2. Modulation techniques are roughly divided into ___ types.
(A) Four
(B) Three
(C) Two
(D) Five
3. The superheterodyne receiver is the most common configuration for ___ communication.
(A) Audio
(B) Satellite
(C) Micro
(D) Radio
4. Noise is random, undesirable energy that enters the communications system.
(A) Heat
(B) Mechanical
(C) Sound
(D) Electrical
5. SSB can be generated by:
(A) All of the above
(B) Phase cancellation method
(C) Good attenuation continuity
(D) Filter method
6. FM transmitting and receiving as compared to AM equipment is:
(A) Costly
(B) Cheaper
(C) Almost equally costly
(D) None of the above
7. For AM receivers the standard IF frequency is:
(A) 455 KHz
(B) 106 KHz
(C) 1.07 MHz
(D) 10.7 MHz
8. The disadvantage of FM over AM is that:
(A) High output power is needed
(B) High modulating power is needed
(C) Large bandwidth is required
(D) Noise is very high for high frequency
9. In modulation “carrier” is:
(A) Resultant wave
(B) Speed voltage to be transmitted
(C) Voltage with constant frequency, phase or amplitude
(D) Voltage for which frequency, phase or amplitude varied
10. PAM stands for:
(A) Pulse Analog Modulation
(B) Phase Analog Modulation
(C) Phase Amplitude Modulation
(D) Pulse Amplitude Modulation
11. In a FM receiver, amplitude limiter:
(A) Amplifies low frequency signal
(B) Reduces the amplitude of the signals
(C) Eliminates any change in amplitude of received amplitude signals
(D) None of the above