Electronics and Communication Engineering - Analog Electronics

6. 

Which configuration has high input impedance and low output impedance?

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

Answer: Option C

Explanation:

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7. 

Assertion (A): An ac amplifier uses coupling capacitors at input and output

Reason (R): The capacitive reactance varies inversely with frequency. It is infinite for dc

A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct

Answer: Option A

Explanation:

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8. 

Common base configuration is little used because

A. it has low input impedance
B. it has high input impedance
C. it does not heat up
D. it has very high gain

Answer: Option A

Explanation:

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9. 

In figure it is desired that output wave is symmetrical. Then

A. both diodes should be similar and |V1| = |V2|
B. both diodes should be similar
C. |V1| = |V2|
D. either (a) or (b)

Answer: Option A

Explanation:

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10. 

If the plate supply voltage for a plate modulated class C amplifier is E volts, the maximum plate-cathode voltage could be almost as high as

A. E
B. E/2
C. 2E
D. 4E

Answer: Option D

Explanation:

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