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.
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
Answer & Solution
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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
Answer & Solution
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5. A zener diode has ______________ breakdown voltage?
Undefined
Sharp
Zero
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
Answer & Solution
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7. In the breakdown region, a zener didoe behaves like a _______________source?
Constant voltage
Constant current
Constant resistance
None of the above
Answer & Solution
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8. A zener diode is________________ device?
A non-linear
A linear
An amplifying
None of the above
Answer & Solution
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9. Mains a.c. power is converrted into d.c. power for_________________?
Lighting purposes
Heaters
Using in electronic equipment
None of the above
Answer & Solution
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10. The ripple factor of a half-wave rectifier is_________________?
2
1.21
2.5
0.48
11. The maximum efficiency of a half-wave rectifier is _____________?
40.6 %
81.2 %
50 %
25 %
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
Answer & Solution
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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
Answer & Solution
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15. A 1,000 V power supply would use_____________ as a filter capacitor?
Paper capacitor
Air capacitor
Mica capacitor
Electrolytic capacitor
Answer & Solution
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