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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Power Electronics  >  Test: Power Electronics - 2 - Electrical Engineering (EE) MCQ

Test: Power Electronics - 2 - Electrical Engineering (EE) MCQ


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

Test: Power Electronics - 2 for Electrical Engineering (EE) 2024 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) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power Electronics - 2 below.
Solutions of Test: Power Electronics - 2 questions in English are available as part of our Power Electronics for Electrical Engineering (EE) & Test: Power Electronics - 2 solutions in Hindi for Power Electronics course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Power Electronics - 2 | 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
Test: Power Electronics - 2 - Question 1
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A dc circuit breaker must use

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Natural commutation is possible only in ac circuits.

Test: Power Electronics - 2 - Question 2
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In a single phase full wave regulator feeding R-L load, the minimum firing angle can be zero.

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Range of control of a is 0 ≤ a ≤ p.

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Test: Power Electronics - 2 - Question 3
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An RC snubber circuit is used to protect a thyristor against :

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Especially high during switching.

Test: Power Electronics - 2 - Question 4
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A DIAC has two terminals, anode and cathode.
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They are designated as T1 and T2 because diac can conduct in both directions.

Test: Power Electronics - 2 - Question 5
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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
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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
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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
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Average output voltage is reduced to 50% if a = 90º. Hence speed is also reduced to 50%.

Test: Power Electronics - 2 - Question 7
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A static induction thyristor
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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
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A single phase step up cycloconverter changes 50 Hz to 100 Hz. Then one half wave of input will give rise to
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Since output frequency is 2f, one half wave of input must equal one full wave of output.

Test: Power Electronics - 2 - Question 9
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Which of these triggering methods for series connected SCRs use LASCR in the gate circuit?
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Optical triggering uses LASCR.

Test: Power Electronics - 2 - Question 10
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A 3 phase ac regulator uses
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Two thyristors for each phase.

Test: Power Electronics - 2 - Question 11
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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
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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
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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
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In a three-phase full wave regulator, output voltage is zero if a ≥ 150º.

Test: Power Electronics - 2 - Question 14
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A thyristor is reverse biased. A positive gate pulse is applied. The thyristor
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Thyristor can turn on only when it is forward biased.

Test: Power Electronics - 2 - Question 15
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A single phase series converter is used for
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Series connection increases the voltage.

Test: Power Electronics - 2 - Question 16
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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
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Free wheeling diode is forward biased only when SCR is reverse biased.

Test: Power Electronics - 2 - Question 17
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An SBS can conduct is one direction only.
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It is a bilateral switch.

Test: Power Electronics - 2 - Question 18
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A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is
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.

Test: Power Electronics - 2 - Question 19
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Assertion (A): An inverter does not require forced commutation

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

Test: Power Electronics - 2 - Question 20
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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
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PIV is twice the peak voltage across each half of secondary.

Test: Power Electronics - 2 - Question 21
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The number of doped regions in a SCR is
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p = n = p = n.

Test: Power Electronics - 2 - Question 22
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All inverters use forced commutation.
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Line commutated inverters are also used especially in HVDC.

Test: Power Electronics - 2 - Question 23
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In 180º mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.
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In 180º mode three thyristors conduct simultaneously.

Test: Power Electronics - 2 - Question 24
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In a single phase full wave ac regulator the rms value of load current is 20 A load is purely resistive. Then
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Each thyristor conducts for 50% of time.

Test: Power Electronics - 2 - Question 25
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A reactor is used in a dual converter operating in non-circulating current mode.
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Reactor is used only for circulating current mode.

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