Electrical Engineering MCQs

Page No. 172

In a rotary converter armature currents are______________?


ad.c. only

✖


ba.c. only

✖


cpartly a.c. and partly d.c.

✓


dNone of them

✖



In which of the following appUcations, direct current is absolutely essential ?


aIllumination

✖


bElectrolysis

✓


cVariable speed operation

✖


dTraction

✖


View Answer Electrolysis

In a mercury arc rectifier positive ions are attracted towards______________?


aanode

✖


bcathode

✓


cshell bottom

✖


dmercury pool

✖


View Answer cathode

In which of the following equipment direct current is needed ?


aTelephones

✖


b Relays

✖


cTime switches

✖


dAll of the above

✓


View Answer All of the above

Which of the following AC. motors is usually used in large motor-generator sets?


aSynchronous motor

✓


bSquirrel cage induction motor

✖


cSlip ring induction motor

✖


d Any of the above

✖


View Answer Synchronous motor

In a rotary converter I2R losses as compared to a D.C. generator of the same size will be___________?


asame

✖


b less

✓


cdouble

✖


dthree times

✖


View Answer less

The potential drop in the arc, in a mercury arc rectifier, varies_____________?


a0.05 V to 0.2 V per cm length of the arc

✖


b 0.5 V to 1.5 V per cm length of the arc

✖


c2 V to 3.5 V per cm length of the arc

✓


dnone of the above

✖



Mercury, in arc rectifiers, is chosen for cathode because________________?


aits ionization potential is relatively low

✖


b its atomic weight is quite high

✖


cits boiling point and specific heat are low

✖


dall of the above

✓


View Answer all of the above

Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of _____________?


a100 A at 100 V

✖


b200 A at 200 V

✖


c400 A at 400 V

✖


d500 A at 500 V

✓


View Answer 500 A at 500 V

The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?


aexpenditure of energy in ionization

✖


b surface resistance

✖


cexpenditure of energy in overcoming the electrostatic field

✖


dexpenditure of energy in liberating electrons from the mercury

✓



Goto Page No.

Page 172 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