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Test: Power Electronics - 2


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25 Questions MCQ Test Power Electronics | Test: Power Electronics - 2

Test: Power Electronics - 2 for Electrical Engineering (EE) 2023 is part of Power Electronics preparation. The Test: Power Electronics - 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power Electronics - 2 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 - 2 below.
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Test: Power Electronics - 2 - Question 1

A dc circuit breaker must use

Detailed Solution for Test: Power Electronics - 2 - Question 1

Natural commutation is possible only in ac circuits.

Test: Power Electronics - 2 - Question 2

In a single phase full wave regulator feeding R-L load, the minimum firing angle can be zero.

Detailed Solution for Test: Power Electronics - 2 - Question 2

Range of control of a is 0 ≤ ap.

Test: Power Electronics - 2 - Question 3

An RC snubber circuit is used to protect a thyristor against :

Detailed Solution for Test: Power Electronics - 2 - Question 3

Especially high during switching.

Test: Power Electronics - 2 - Question 4

A DIAC has two terminals, anode and cathode.

Detailed Solution for Test: Power Electronics - 2 - Question 4

They are designated as T1 and T2 because diac can conduct in both directions.

Test: Power Electronics - 2 - Question 5

A single phase semiconverter has a freewheeling diode. If the firing angle is a and the load is purely resistive, the periods of conduction and freewheeling respectively are

Detailed Solution for Test: Power Electronics - 2 - Question 5

Freewheeling diode conducts only when load is inductive. If load is purely resistive free wheeling diode does not come into operation.

Test: Power Electronics - 2 - Question 6

A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90º, the speed is likely to be

Detailed Solution for Test: Power Electronics - 2 - Question 6

Average output voltage is reduced to 50% if a = 90º. Hence speed is also reduced to 50%.

Test: Power Electronics - 2 - Question 7

A static induction thyristor

Detailed Solution for Test: Power Electronics - 2 - Question 7

It can be turned on by positive gate pulse and turned off by negative gate pulse. It is minority carrier device. It can be manufactured in high current and high voltage ratings and its on state voltage drops is low.

Test: Power Electronics - 2 - Question 8

A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to

Detailed Solution for Test: Power Electronics - 2 - Question 8

Since output frequency is 2f, one half wave of input must equal one full wave of output.

Test: Power Electronics - 2 - Question 9

Which of these triggering methods for series connected SCRs use LASCR in the gate circuit?

Detailed Solution for Test: Power Electronics - 2 - Question 9

Optical triggering uses LASCR.

Test: Power Electronics - 2 - Question 10

A 3 phase ac regulator uses

Detailed Solution for Test: Power Electronics - 2 - Question 10

Two thyristors for each phase.

Test: Power Electronics - 2 - Question 11

The average load current supplied by a thyristor depends on

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The firing angle controls the period of conduction and hence average load current.

Test: Power Electronics - 2 - Question 12

A dc chopper is feeding an RLE load. The maximum steady state ripple is

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(Imax - Imin)max = .

Test: Power Electronics - 2 - Question 13

In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160º. The line to line output voltage would be

Detailed Solution for Test: Power Electronics - 2 - Question 13

In a three-phase full wave regulator, output voltage is zero if a ≥ 150º.

Test: Power Electronics - 2 - Question 14

A thyristor is reverse biased. A positive gate pulse is applied. The thyristor

Detailed Solution for Test: Power Electronics - 2 - Question 14

Thyristor can turn on only when it is forward biased.

Test: Power Electronics - 2 - Question 15

A single phase series converter is used for

Detailed Solution for Test: Power Electronics - 2 - Question 15

Series connection increases the voltage.

Test: Power Electronics - 2 - Question 16

A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR

Detailed Solution for Test: Power Electronics - 2 - Question 16

Free wheeling diode is forward biased only when SCR is reverse biased.

Test: Power Electronics - 2 - Question 17

An SBS can conduct is one direction only.

Detailed Solution for Test: Power Electronics - 2 - Question 17

It is a bilateral switch.

Test: Power Electronics - 2 - Question 18

A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is

Detailed Solution for Test: Power Electronics - 2 - Question 18

.

Test: Power Electronics - 2 - Question 19

Assertion (A): An inverter does not require forced commutation

Reason (R): A series inverter is a forced commutation inverter.

Detailed Solution for Test: Power Electronics - 2 - Question 19

Some inverters require forced commutation.

Test: Power Electronics - 2 - Question 20

In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is

Detailed Solution for Test: Power Electronics - 2 - Question 20

PIV is twice the peak voltage across each half of secondary.

Test: Power Electronics - 2 - Question 21

The number of doped regions in a SCR is

Detailed Solution for Test: Power Electronics - 2 - Question 21

p = n = p = n.

Test: Power Electronics - 2 - Question 22

All inverters use forced commutation.

Detailed Solution for Test: Power Electronics - 2 - Question 22

Line commutated inverters are also used especially in HVDC.

Test: Power Electronics - 2 - Question 23

In 180º mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.

Detailed Solution for Test: Power Electronics - 2 - Question 23

In 180º mode three thyristors conduct simultaneously.

Test: Power Electronics - 2 - Question 24

In a single phase full wave ac regulator the rms value of load current is 20 A load is purely resistive. Then

Detailed Solution for Test: Power Electronics - 2 - Question 24

Each thyristor conducts for 50% of time.

Test: Power Electronics - 2 - Question 25

A reactor is used in a dual converter operating in non-circulating current mode.

Detailed Solution for Test: Power Electronics - 2 - Question 25

Reactor is used only for circulating current mode.

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