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Test: Power Electronics - 4


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25 Questions MCQ Test Power Electronics | Test: Power Electronics - 4

Test: Power Electronics - 4 for Electrical Engineering (EE) 2023 is part of Power Electronics preparation. The Test: Power Electronics - 4 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power Electronics - 4 MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power Electronics - 4 below.
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Test: Power Electronics - 4 - Question 1

A chopper cannot be line commutated.

Test: Power Electronics - 4 - Question 2

Natural commutation can be used in :

Test: Power Electronics - 4 - Question 3

In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

Test: Power Electronics - 4 - Question 4

A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if

Test: Power Electronics - 4 - Question 5

McMurray Bedford full bridge inverter uses

Test: Power Electronics - 4 - Question 6

Which converter is used in HVDC transmission?

Test: Power Electronics - 4 - Question 7

Assertion (A): The turn on time of SCR is about 1 to 4 ms.

Reason (R): The turn off time of SCR is about 10 to 300 ms.

Test: Power Electronics - 4 - Question 8

An n pulse rectifier is fed by a source having an inductance L. If load current is I0, the voltage drop due to overlap is

Test: Power Electronics - 4 - Question 9

Which chopper circuit operates in all the 4 quadrants?

Test: Power Electronics - 4 - Question 10

A single phase cycloconverter feeds a resistance heating load. The heating power is provided by

Test: Power Electronics - 4 - Question 11

A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin ωt. The firing angle is a. The dc output voltage is

Test: Power Electronics - 4 - Question 12

Which of these commutation methods uses an external pulse for commutation?

Test: Power Electronics - 4 - Question 13

A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be

Test: Power Electronics - 4 - Question 14

In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is

Test: Power Electronics - 4 - Question 15

A relaxation oscillator uses

Test: Power Electronics - 4 - Question 16

In a 3 phase bridge inverter with 180º mode of operation the numbers of thyristors conducting at one time are

Test: Power Electronics - 4 - Question 17

A single phase full converter can operate in

Test: Power Electronics - 4 - Question 18

In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle

Test: Power Electronics - 4 - Question 19

In the circuit of figure, the load current when thyristor is off

Test: Power Electronics - 4 - Question 20

A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is

Test: Power Electronics - 4 - Question 21

In brushless excitation system of modern alternators, the main exciter is

Test: Power Electronics - 4 - Question 22

The two-transistor model of a thyristor consists of two transistors :

Test: Power Electronics - 4 - Question 23

In a thyristor, the forward breakover voltage

Test: Power Electronics - 4 - Question 24

The gate lead, in a thyristor is welded to :

Test: Power Electronics - 4 - Question 25

In a 3 phase full converter, the firing angle is less than 60º. The instantaneous output voltage

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