Electronics and Communication Engineering - Electronic Devices and Circuits

31. 

Typical value of reverse current in a semiconductor diode is

A. 1 A
B. 0.1 A
C. 1 μA
D. 0.1 μA

Answer: Option D

Explanation:

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32. 

Which of the following element has four valence electrons?

A. Silicon
B. Germanium
C. Both (a) and (b) above
D. None of the above

Answer: Option C

Explanation:

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33. 

In a transistor operating in forward active mode

A. depletion layer between emitter and base is thin and that between base and collector is also thin
B. both depletion regions are thick
C. depletion layer between emitter and base is thin and that between base and collector is thick
D. depletion layer between emitter and base is thick and that between base and collector is thin

Answer: Option C

Explanation:

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34. 

In standard TTL, the 'totem pole' stage refers to

A. the multi-emitter I/P stage
B. phase splitter
C. the O/P buffer
D. open collector O/P stage

Answer: Option C

Explanation:

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35. 

In p type semiconductor, the hole concentration

A. is nearly equal to density of acceptor atoms
B. is much greater than density of acceptor atoms
C. is much less than density of acceptor atoms
D. may be equal to or more or less than density of acceptor atoms

Answer: Option A

Explanation:

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