Electronics and Communication Engineering - Analog Electronics

11. 

A Clapp's oscillator is

A. a modified Hartley oscillator
B. a modified Colpitt's oscillator
C. a modified RC oscillator
D. none of the above

Answer: Option B

Explanation:

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12. 

In the circuit shown in the figure, the approximate voltage at the transistor,

A. base and emitter respectively are -8 V and -7.3 V
B. base and collector respectively are -8 V and -5 V
C. Collector and emitter respectively are -5 V and -7.3
D. base, emitter and collector respectively are -8 V, 7.3 V and -5 V

Answer: Option D

Explanation:

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13. 

A quiescent state of a transistor implies

A. zero bias
B. no output
C. no distortion
D. no input signal

Answer: Option C

Explanation:

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14. 

A transistor may fail due to

A. open weld at the wire leads to the semi-conductor
B. short circuit caused by momentary overloads
C. overheating due to circuit failures
D. any of the above

Answer: Option D

Explanation:

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15. 

In a P-N-P transistor, with normal bias, the emitter junction

A. is always reverse biased
B. offers very high resistance
C. offers a low resistance
D. remains open

Answer: Option C

Explanation:

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