Electronics and Communication Engineering - Radio Receivers

Exercise :: Radio Receivers - Section 1

6. 

In a broadcast superheterodyne receiver

A. the local oscillator operates below the signal frequency
B. local oscillator frequency is normally double the IF
C. RF amplifier normally works at kHz above the carrier frequency
D. mixer input must be tuned to the signal frequency

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

7. 

A duplexer is a device used to

A. feed more than one receiver from a single antenna
B. connect two transmitters to the same antenna
C. connect a receiver and a transmitter to the same antenna
D. none of these

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

8. 

A heterodyne frequency changer is called a

A. Modulator
B. Mixer
C. Demodulator
D. Frequency translator

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

9. 

RF amplifiers are used in radio receivers for

A. improved image frequency rejection
B. improved rejection of adjacent unwanted signals
C. prevention of re-radiation of the local oscillator through the antenna of the receiver
D. all of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

10. 

The sensitivity curve of a standard receiver is represented by

A. curve A
B. curve B
C. curve C
D. curve D

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.