Electronics and Communication Engineering - Electronic Devices and Circuits

41. 

Gel is

A. a polymer having side groups distributed randomly along a vinly polymer chain
B. a polymer having secondary chains branching from the main molecular chain
C. a solid frame work of colloidal particles linked together and containing a fluid
D. a polymer in which the repeating unit of each molecule has vinyl group

Answer: Option C

Explanation:

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42. 

When a P-N junction is unbiased, the junction current at equilibrium is

A. zero as no charges cross the junction
B. zero as equal number of carriers cross the barrier
C. mainly due to diffusion of majority carriers
D. mainly due to diffusion of minority carriers

Answer: Option B

Explanation:

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43. 

Which one of the following material has the highest dielectric strength?

A. Porcelain
B. Soft rubber
C. Glass
D. polystyrene

Answer: Option B

Explanation:

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44. 

Assertion (A): In p type semiconductor conduction is mainly due to holes.

Reason (R): In p type material the holes are majority carriers.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option A

Explanation:

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45. 

In common base configuration, the input characteristics of bipolar junction transistor are drawn between

A. VEB and IE
B. VCB and IC
C. IC and VCE
D. IE and VCE

Answer: Option A

Explanation:

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