Electronics and Communication Engineering - Analog Electronics

1. 

Which of the following amplifier circuits has highest input impedance?

A. Circuit using BJT
B. Circuit using JFET
C. Circuit using MOSFET
D. Either (a) or (b)

Answer: Option C

Explanation:

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2. 

Which of the following device acts as an N-P-N and a P-N-P transistor connected base to base and emitter to controller?

A. UJT
B. SCR
C. Diac
D. Triac

Answer: Option B

Explanation:

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3. 

A differentiating amplifier has capacitor in the input path.

A. True
B. False

Answer: Option A

Explanation:

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4. 

Which of the following statement about TRIAC is incorrect?

A. It is not particularly suited to A.C. or mains power control
B. Any one of its main terminals can be used either as cathode or as anode
C. It can be triggered in response to both positive and negative gate terminals
D. None of the above

Answer: Option A

Explanation:

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5. 

A half wave diode rectifier and full wave diode bridge rectifier both have an input frequency of 50 Hz. The frequencies of outputs respectively are

A. 100 Hz and 50 Hz
B. 50 Hz and 100 Hz
C. 100 Hz each
D. 50 Hz each

Answer: Option B

Explanation:

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