Electronics and Communication Engineering - Analog Electronics

46. 

Examine the circuit of figure and the following statements

  1. Vs is more than the zener breakdown voltage.
  2. IL = I1 - I2.
  3. Rs is less than zener nominal resistance.
Which of the above statements are correct?

A. 1, 2, 3
B. 1, 2
C. 1 only
D. 2 and 3

Answer: Option B

Explanation:

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47. 

The approximate value of input impedance of CE amplifier with emitter resistance RE is given by

A. hie + Ai RE
B. hie + (1 + hfe) RE
C. hie
D. (1 + hfe) RE

Answer: Option C

Explanation:

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48. 

The advantage of using crystal oscillator is that it

A. requires low d.c. supply voltage
B. works at high frequency
C. gives high output voltage
D. gives constant frequency of oscillations

Answer: Option D

Explanation:

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49. 

A transistor will operate in inverted region when

A. emitter junction is forward biased and collector junction is reverse biased
B. emitter junction is reverse biased and collector junction is forward biased
C. emitter junction as well as collector junction are forward biased
D. emitter junction as well as collector junction are reverse biased

Answer: Option B

Explanation:

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50. 

Cross-over distortion behaviour is a characteristic of

A. class A output stage
B. class B output stage
C. class AB output stage
D. common base output stage

Answer: Option B

Explanation:

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