Electronics and Communication Engineering - Radio Receivers

Exercise :: Radio Receivers - Section 1

36. 

An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is

A. 114 kW
B. 336 kW
C. 384 kW
D. 455 kW

Answer: Option B

Explanation:

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37. 

The output of a diode detector contains

A. D.C. voltage
B. modulating signal
C. RF ripple
D. all of the above

Answer: Option D

Explanation:

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38. 

Which of the following noise does not occur in transistors?

A. Partition noise
B. Shot noise
C. Flicker noise
D. Resistance noise

Answer: Option A

Explanation:

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39. 

Noise generated in a resistor is also known as

A. partition noise
B. white noise
C. thermal noise
D. shot noise

Answer: Option C

Explanation:

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40. 

Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?

A. Variable tuning inductor
B. Ganged tuning inductor
C. Variable capacitor
D. Variable preset

Answer: Option B

Explanation:

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