Radio Receivers - Section 1 (6)

Directions to Solve

Radio Receivers - Section 1

41.

The sensitivity curve of a standard receiver is represented by

08-79

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

Answer: Option C

Explanation:

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42.

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:

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43.

A heterodyne frequency changer is called a

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

Answer: Option B

Explanation:

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44.

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:

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45.

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:

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46.

Most popular IF for receivers tuning to 540 to 1650 kHz is

A.	433 kHz
B.	455 kHz
C.	545 kHz
D.	555 kHz

Answer: Option B

Explanation:

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47.

Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

A.	Variable selectivity
B.	Variable sensitivity
C.	Double conversion
D.	Squelch

Answer: Option B

Explanation:

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48.

The function of an AM detector circuit is to

A.	rectify the input signal
B.	discard the carrier
C.	provide audio signal
D.	all of the above

Answer: Option D

Explanation:

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