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# Test: Power Electronics - 6

## 25 Questions MCQ Test Power Electronics | Test: Power Electronics - 6

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Attempt Test: Power Electronics - 6 | 25 questions in 25 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Power Electronics for Electrical Engineering (EE) Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### In a single phase semi-converter the number of thyristors is

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QUESTION: 4

A dc chopper is feeding an RLE load. The current can become discontinuous if

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QUESTION: 5

Which of these commutation methods uses two leads?

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QUESTION: 6

A single phase half wave rectifier is feeding a resistive load. As firing angle is increased

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QUESTION: 7

A cycloconverter for single phase operation has

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QUESTION: 8

A chopper is a high efficiency circuit.

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QUESTION: 9

The difference between resonant commutation and self commutation is

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QUESTION: 10

If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is

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QUESTION: 11

In a series inverter

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QUESTION: 12

A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are

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QUESTION: 13

Which of these devices is used in relaxation oscillator?

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QUESTION: 14

In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is

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QUESTION: 15

In a single phase semiconverter feeding a highly inductive load, the load current is

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QUESTION: 16

Two thyristors of the same rating and specifications

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QUESTION: 17

A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque

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QUESTION: 18

In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is

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QUESTION: 19

A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ωt. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively

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QUESTION: 20

In a cycloconverter it is possible to vary

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QUESTION: 21

A single phase full bridge inverter for R-L loads needs

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QUESTION: 22

In the basic series inverter circuit, the source current has

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QUESTION: 23

Thyristors connected in series need static and dynamic stabilizing circuits.

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QUESTION: 24

In a controlled rectifier a freewheeling diode is necessary if the load is

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QUESTION: 25

For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

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