Power Electronics MCQ

Power Electronics MCQ | Freshers & Experienced

Sharad Jaiswal
12th Feb, 2021

We have listed below the best Power Electronics MCQ Questions for your basic knowledge of Power Electronics. This Power Electronics MCQ Quiz contains 25 multiple Choice Questions. You have to select the right answer to every question.

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Power Electronics MCQ

Power Electronics MCQ

1) A silicon controlled rectifier (SCR) is a

A. Unijunction device
B.Device with three junction
C.Device with four junction
D.Both A & B

2) Duration of the pulse in a pulse triggering system for thyristors should be at minimum.

A. 10 μs
B.15 μs
C.10 ms
D.15 ms

3) Lascr stands for______

A. Light Activated Silicon Controlled Rectifier
B.Light Activated System Controlled Rectifier
C.Light Advanced System Controlled Rectifier
D.Light Activated System Common Rectifier

4) SCR can be termed as

A. AC switch
B.DC switch
C.Square-wave switch
D.None of these

5) Gate characteristic of a thyristor

A. Is of the type Vg = a + bIg
B.Is a curve between Vg and Ig
C.Is straight line passing through origin
D.Has a spread between two curves of Vg-Ig

6) LASCR is a

A. Thyristor
B.Rectifier
C.Diode
D.Both A & B

7) The triple frequency of a six-phase half wave rectifier for 220 v, 60 hz input will be______

A. 240 Hz
B.360 Hz
C.640 Hz
D.440 Hz

8) A triac is a______

A. A four-terminal device
B.Not a thyristor
C.Like a bidirectional SCR
D.None of the above

9) Which of the following statement is true about thyristor?

A. The turn-on time is less than the turn-off time
B.The turn off time of a thyristor is less than the turn-on time
C.The turn-off time for the line commutation
D.None of these

10) Which one of the following statement is true.

A. For SCRs to be in conduction state, forward anode current must be greater than the latching current
B.For SCRs to be in blocking state, forward anode current must be lower than the holding current
C.When avalanche break down takes place, SCRs enter into the conduction state
D.All of the above

11) Thyristor is basically used:

A. A set of SCRs
B.A set of SCR, diac and a triac
C.A combination of diac and triac
D.PNPN device

12) TRIACS cannot be used, In AC voltage regulator_______

A. R-L Load
B.Inductive load
C.Resistive load
D.Back emf load

13) Unipolar modulation is generally used in

A. AC - AC converters
B.DC - DC converters
C.AC - DC converters
D.DC - AC converters

14) The diac can be represented by

A. Two SCRs in parallel
B.Two diodes in parallel
C.Two diodes in anti-parallel
D.Two SCRs in anti-parallel

15) Resistor is used in Snubber circuit are:

A. Minimize the loss
B.Minimize the charging current
C.Minimize the discharging current
D.None of these

16) The normal way to turn on a SCR is by______

A. Anode current
B.Gate current
C.Breakover voltage
D.Both A & B

17) Chopper is a

A. DC transformer
B.High speed semiconductor switch
C.Time ratio controller
D.AC to DC converter

18) Diode is a

A. Linear Device
B.Nonlinear Device
C.Unipolar Device
D.Bilateral Device

19) The Three leads of a common transistor

A. Collector Base Emitter
B.Base Collector Case
C.Collector Base Omitter
D.Emitter Collector Base

20) CRO stand for

A. Capacitor Resistor Output
B.Cathode Ray Oscillator
C.Capacitor Resistor Oscilloscope
D.Cathode Ray Oscilloscope

21) The typical value of SCR for modern alternator______

A. 0.5
B.1.0
C.1.2
D.1.5

22) Diac has________ pn junctions.

A. 1
B.2
C.3
D.4

23) For an SCR, dv/dt protection is achieved through

A. RC across SCR
B.L across SCR
C.L in series with SCR
D.RL in series with SCR

24) Devices which performs DC-AC conversion:

A. Switch
B.Inverter
C.Chopper
D.Rectifier

25) Which one is most suitable power device for high frequency (>100 KHz) switching application?

A. BJT
B.Schottky diode
C.Power MOSFET
D.None of These

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