Semiconductor Diode Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Semiconductor Diode ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Semiconductor Diode comprehensively.

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1.
A zener diode utilizes ______________ characteristics for its operation?

Forward

Reverse

Both forward and reverse

None of the above

2.
If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is__________________?

400/√2 V

400 V

400 x √2 V

None of the above

3.
There is a need of transformer for__________________?

Half-wave rectifier

Centre-tap full-wave rectifier

Bridge full-wave rectifier

None of the above

4.
The disadvantage of a half-wave rectifier is that the__________________?

Components are expensive

Diodes must have a higher power rating

Output is difficult to filter

None of the above

6.
A series resistance is connected in the zener circuit to_______________?

Properly reverse bias the zener

Protect the zener

Properly forward bias the zener

None of the above

7.
In the breakdown region, a zener didoe behaves like a _______________source?

Constant voltage

Constant current

Constant resistance

None of the above

9.
Mains a.c. power is converrted into d.c. power for_________________?

Lighting purposes

Heaters

Using in electronic equipment

None of the above

12.
For the same secondary voltage, the output voltage from a centre-tap rectifier is___________ than that of bridge rectifier?

Twice

Thrice

Four time

One-half

13.
A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop?

27.5 V

86.5 V

30 V

42.5 V

14.
_____________ filter circuit results in the best voltage regulation?

Choke input

Capacitor input

Resistance input

None of the above

15.
A 1,000 V power supply would use_____________ as a filter capacitor?

Paper capacitor

Air capacitor

Mica capacitor

Electrolytic capacitor

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