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Power Electronics 3 Electrical Engineering MCQ Practice Quiz 6

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Power Electronics 3 Electrical Engineering Practice Quiz 6

1 / 25

Any electrical signal present in a circuit other than the desired signal is known as____?

2 / 25

In single phase VSI, the harmonic which is not present is____?

3 / 25

In the operation and control of both naturally commutated and forced commutated SCR base' converter, commutation plays an important role .The converters is / are____?

4 / 25

Double edge modulation eliminates certain harmonics when the reference is a_____?

5 / 25

The carrier which are commonly used in constant – frequency PWM is_____?

6 / 25

In a three phase converter, the number of notches per cycle is_____?

7 / 25

The control method used for PWM dc - do converter is_____?

8 / 25

The average value of the output voltage in a step - down dc chopper is given by____?

9 / 25

Choppers is a______?

10 / 25

In BJT, switching losses occurs_____?

11 / 25

DIAC are specifically designed to trigger_____?

12 / 25

Voltage commutation circuit can be converted into a current commutation by interchanging the positions of_____?

13 / 25

For power output higher than 15 kW, the suitable rectifier is_____?

14 / 25

In a full wave rectifier, the rectification ratio is approximately equal to______?

15 / 25

In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______?

16 / 25

A single phase ac – dc converter is also known as_____?

17 / 25

In a silicon controlled rectifier, the load is connected_____?

18 / 25

Number of PN junction in an SCR____?

19 / 25

What is the advantage of HRC fuses over Rewireable fuses_____?

20 / 25

The power demand can be estimated approximately by_____?

21 / 25

4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____?

22 / 25

Unipolar modulation is generally used in_____?

23 / 25

A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. value of n will be____?

24 / 25

By which one of the following we can measure the reliability of a string_____?

25 / 25

Anode current in an SCR consists of_____?

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