Electronics and Communication Engineering - Analog Electronics

31. 

The linear transistor circuits always operate in the

A. saturation
B. cut off
C. active
D. inactive

Answer: Option C

Explanation:

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32. 

In the graphical analysis of CE amplifier circuit, the intersection of base current and dc load line is called

A. saturation point
B. cut off point
C. Q point
D. operating point

Answer: Option C

Explanation:

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33. 

In an amplifier circuit the emitter is at ac ground potential in a

A. CB circuit
B. CC circuit
C. CE circuit
D. both CB and CE circuit

Answer: Option C

Explanation:

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34. 

An ideal op-amp has

A. infinite input and output resistance
B. low input and output resistance
C. low input and high output resistance
D. infinite input resistance and zero output resistance

Answer: Option D

Explanation:

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35. 

A class B amplifier

  1. is biased just at cutoff
  2. has a high theoretical efficiency of 78.5% because its quiescent current is low
  3. is biased at midpoint of load line
Of the above statements

A. 2 and 3 are correct
B. 1 alone is correct
C. 1 and 2 are correct
D. 2 alone is correct

Answer: Option D

Explanation:

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