# Power Electronics - Electrical Engineering (MCQ) questions and answers

Dear Readers, Welcome to Power Electronics multiple choice questions and answers with explanation. These objective type Power Electronics questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.

Specially developed for the Electrical Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies.

These tutorial are also important for your viva in university exams like Anna university, Pune, VTU, UPTU, CUSAT etc.

1)   The power demand can be estimated approximately by
- Published on 21 Nov 15

b. Mathematical method.
c. Statistical method.
d. Economic parameters.
 Answer  Explanation  Related Ques ANSWER: Statistical method. Explanation: No explanation is available for this question!

2)   What is the advantage of HRC fuses over Rewirable fuses?
- Published on 17 Nov 15

a. High speed operation
b. High rupturing capacity
c. No ageing effect.
d. All of the above.
 Answer  Explanation  Related Ques ANSWER: All of the above. Explanation: No explanation is available for this question!

3)   If a shunt motor is started with its field winding open then
- Published on 23 Oct 15

a. It will rotate at the same speed as that with its field winding closed
b. It will rotate at less speed as that with its field winding closed
c. It will rotate at dangerously high speed
d. None of these
 Answer  Explanation  Related Ques ANSWER: It will rotate at dangerously high speed Explanation: No explanation is available for this question!

4)   Electrical power output in a d.c. generator is equal to
- Published on 19 Oct 15

a. Electrical power developed in armature – copper losses
b. Mechanical power input – iron and friction losses
c. Electrical power developed in armature – iron and copper losses
d. Mechanical power input – iron and friction losses – copper losses
 Answer  Explanation  Related Ques ANSWER: Mechanical power input – iron and friction losses – copper losses Explanation: No explanation is available for this question!

5)   The quadrant operation of BJT is represented by
- Published on 08 Sep 15

a. 1
b. 2
c. 3
d. 4
 Answer  Explanation  Related Ques ANSWER: 2 Explanation: No explanation is available for this question!

6)   The switching function of semiconductor devices can be characterized with
- Published on 08 Sep 15

a. Duty ratio only
b. Frequency only
c. Duty ratio and frequency
d. Duty ratio, frequency and time delay
 Answer  Explanation  Related Ques ANSWER: Duty ratio, frequency and time delay Explanation: No explanation is available for this question!

7)   AC power in a load can be controlled by using
- Published on 08 Sep 15

a. two SCR’s in parallel opposition
b. two SCR’s in series
c. three SCR’s in series
d. four SCR’s in series
 Answer  Explanation  Related Ques ANSWER: two SCR’s in parallel opposition Explanation: No explanation is available for this question!

8)   An SCR is made up of silicon because
- Published on 08 Sep 15

a. silicon has large leakage current than germanium
b. silicon has small leakage current than germanium
c. silicon has small leakage voltage than germanium
d. silicon has large leakage voltage than germanium
 Answer  Explanation  Related Ques ANSWER: silicon has small leakage current than germanium Explanation: No explanation is available for this question!

9)   The output power of the cascaded amplifier / attenuator system can be determined using
- Published on 08 Sep 15

a. Actual gain of amplifier
b. Actual gain of amplifier and attenuator
c. Gain in dB of amplifier and attenuator
d. Actual gain of attenuator
 Answer  Explanation  Related Ques ANSWER: Actual gain of amplifier and attenuator Explanation: No explanation is available for this question!

10)   LISN is a device used to measure conducted emissions. LISN stands for
- Published on 08 Sep 15

a. Line integrated stabilization network
b. Line impedance stabilization network
c. Line integrated stored network
d. Laser integrated stabilization networking
 Answer  Explanation  Related Ques ANSWER: Line impedance stabilization network Explanation: No explanation is available for this question!

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