Electronics and Communication Engineering - Analog Electronics

36. 

Which of the following statement is correct?

A. A FET is a current controlled device
B. A BJT is always reverse biased
C. The semi-conductor material of the gate in an N-channel JFET is p-type
D. JFET has higher input impedance than MOSFET

Answer: Option C

Explanation:

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37. 

In a bipolar transistor at room temperature if the emitter current is doubled the voltage across its base emitter junction

A. doubles
B. halves
C. increase by about 20 mV
D. decrease by about 20 mV

Answer: Option B

Explanation:

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38. 

Which one of the following power amplifier has the maximum efficiency?

A. Class A
B. Class B
C. Class AB
D. Class C

Answer: Option D

Explanation:

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39. 

Negative feedback lowers the cut off frequency and increase the upper cut off frequency of amplifier.

A. True
B. False

Answer: Option A

Explanation:

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40. 

In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3 dB frequency is

A. zero
B. 135°
C. 180°
D. 225°

Answer: Option B

Explanation:

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