Electrical Engineering MCQs

Page No. 360

A thyristor can termed as__________?


aAC switch


bDC switch


cBoth a and B


dSquare wave switch


View Answer DC switch

Which of the following is used in heat sink_____________?


aIron


bAluminium


cCarbon


dSilver


View Answer Aluminium

How can we protect SCR from thermal conditions _____________?


aUse of snubber circuit.


bUsing heat sink.


cUsing CB and fuse.


dUsing equalizing circuit


View Answer Using heat sink.

Thyristor is nothing but a____________?


aControlled transistor


bControlled switch


cAmplifier with higher gain


d Amplifier with large current gain


View Answer Controlled switch

Gate circuit or triggering circuit of a thyristor is


alower power circuit.


bhigh power circuit.


cmagnetic circuit.


dmay be low power or high power circuit


View Answer lower power circuit.

After proper turn on of thyristor____________?


agate signal is always present


bgate signal must be removed


cgate signal should present but can be removed


dnone of the above.



SCR will be turned off when anode current is_______________?


a< latching current but greater than holding current and gate signal is 0.


bless than holding current.


c< latching current but greater than holding current and gate signal is present.


dboth (A) and (B).


View Answer both (A) and (B).

The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?


a600 V/µs


b800 V/µs


c1200 V/µs


d1000 V/µs


View Answer 800 V/µs

BCT is used for____________?


aHigh power phase control


bHigh power current control


cLow power current control


dLow power phase control



Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?


aVc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.


bVc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.


cVc1 = Vc2 = Vc3 any value of Ig.


dVc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil



Goto Page No.

Page 360 of 366

Alphabetical MCQs Categories

Here below You find all kind of categories of MCQs in alphabetical order.


"Comprehensive Collection of MCQs: Alphabetically Organized by Subject"

"Discover an extensive collection of multiple-choice questions (MCQs) neatly categorized by subject from A to Z. This resource is designed for anyone eager to explore various topics in a straightforward and organized manner. Whether you're a student preparing for exams, an educator seeking supplementary materials, or simply curious about different subjects, this compilation offers a convenient way to learn and assess your knowledge. With questions arranged alphabetically, navigation is effortless, allowing you to delve into subjects of interest at your own pace. Engage, learn, and expand your understanding with this accessible and comprehensive repository of MCQs!"


BolPakistan

bolpakistan.com.pk includes Job Mcqs and Pak Mcqs is the Top Largest Mcqs Forum in World, in which you can read Mcqs of All Subjects, PPSC test preparation, FPSC, NTS and PPSC PAST PAPERS, PPSC PAST MCQS. A Collection of Repeated MCQs for JOBs seekers.

Copyright © 2024, Designed & Developed by BolPakistan