11.Which of the following power amplifiers provides low power dissipation?

11.Which of the following power amplifiers provides low power dissipation?

A. Class C

B. Class A

C. Class AB

D. Class D

12.The purpose of impedance matching network is to allow maximum ________ transfer between source to the load?

A. power

B. current

C. voltage

D. All of the above

13.Which of the following are the two keys to a communication receiver?

A. selectivity

B. sensitivity

C. image frequency

D. both a and b

14.The main function of a Superheterodyne receiver is to convert an incoming signal to a(n) ______.

A. image frequency

B. intermediate frequency

C. high frequency

D. All of the above

15.lntermodulation distortion occurs primarily because of __________.

A. linearities in a circuit

B. nonlinearities in a circuit

C. heat dissipation

D. random motion of electrons

16.Which of the following types of transmission occupies wider bandwidth?

A. base band

B. broad band

C. SSB

D. AM

17.When the dB value is equal to zero, that means the output signal amplitude is _______ the input.

A. less than

B. greater than

C. equal to

D. not dependent on the input

18.Having very high value of Q means ____________ the bandwidth

A. narrow

B. wider

C. Q value is independence on the bandwidth

D. none of the above

19.In AM, over modulation occurs when the modulation index is ___________.

A. equal to 1

B. greater than 1

C. less than 1

D. zero

20.Which of the following modulation scheme occupies narrow bandwidth?

A. FM

B. Full carrier AM

C. Suppressed carrier AM

D. SSB