Electronics and Communication Engineering - Analog Electronics

1. 

In a Hartley oscillator the condition for sustained oscillations is . If there exists mutual inductance M between coils L1 and L2, then the above condition will get modified as hfe

A.
B.
C.
D.

Answer: Option C

Explanation:

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2. 

Figure shows current pulses of a class C power amplifier. The fundamental frequency of these pulses is

A. 100 kHz
B. 1000 kHz
C. 10 kHz
D. 1 kHz

Answer: Option A

Explanation:

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3. 

A FET has

A. very high input resistance
B. very low input resistance
C. high connection emitter junction
D. forward biased PN junction

Answer: Option A

Explanation:

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4. 

A TRIAC is a semiconductor device which acts as a

A. 2 terminal unidirectional switch
B. 2 terminal bidirectional switch
C. 3 terminal bidirectional switch
D. 4 terminal multidirectional switch

Answer: Option C

Explanation:

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5. 

The Clapp oscillator shown in figure will operate at

A. 4.6 kHz
B. 46 kHz
C. 460 kHz
D. 4600 kHz

Answer: Option C

Explanation:

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