Electronics and Communication Engineering - Electronic Devices and Circuits

1. 

At a P-N junction, the potential barrier is due to the charges on either side of the junction, which consists of

A. fixed donor and acceptor ions
B. majority carriers only
C. minority carriers only
D. both majority and minority carriers

Answer: Option A

Explanation:

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2. 

In a vacuum triode μ = rpgm.

A. True
B. False

Answer: Option A

Explanation:

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3. 

The material which has zero temperature coefficient of resistance is

A. manganin
B. porcelain
C. carbon
D. aluminium

Answer: Option A

Explanation:

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4. 

When the light falling on a photodiode increases, the reverse minority current

A. increases
B. increases or decreases
C. decreases
D. remains the same

Answer: Option A

Explanation:

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5. 

When a ferromagnetic substance is magnetised, small changes in dimensions occur. Such a phenomenon is known as

A. magnetic hystresis
B. magnetic expansion
C. magneto striction
D. magneto calorisation

Answer: Option C

Explanation:

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