Electrical Engineering MCQs

Page No. 282

Which of the following statement about D.C. generators is false ?


aCompensating winding in a D.C. machine helps in commutation

✖


bIn a D. C. generator interpoles winding is connected in series with the armature winding

✖


cBack pitch and front pitch are both odd and approximately equal to the pole pitch

✖


dEquilizing bus bars are used with parallel running of D.C. shunt gen¬erators

✓



To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them?


ajust ahead of magnetic neutral axis

✓


b in magnetic neutral axis

✖


c just behind the magnetic neutral axis

✖


d none

✖



A D.C. welding generator has____________?


alap winding

✓


bwave moving

✖


cduplex winding

✖


d any of the above

✖


View Answer lap winding

In a D.C. generator the critical resistance refers to the resistance of_____________?


a brushes

✖


b field

✓


carmature

✖


dload

✖


View Answer field

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?


a640 V

✖


b620 V

✖


c600 V

✖


d580 V

✓


View Answer 580 V

In the case of lap winding resultant pitch is____________?


amultiplication of front and back pitches

✖


bdivision of front pitch by back pitch

✖


c sum of front and back pitches

✖


d difference of front and back pitches

✓



The function of pole shoes in the case of D.C. machine is______________?


a to reduce the reluctance of the mag¬netic path

✖


bto spread out the flux to achieve uniform flux density

✖


cto support the field coil

✖


dto discharge all the above functions

✓



Flashing the field of D.C. generator means:______________?


aneutralising residual magnetism

✖


bcreating residual magnetism by a D.C. source

✓


cmaking the magnetic losses of forces parallel

✖


d increasing flux density by adding extra turns of windings on poles

✖



For a D.C. machines laboratory following type of D.C. supply will be suitable___________?


a rotary converter

✖


b mercury are rectifier

✖


c induction motor D.C. generator set

✓


dsynchronous motor D.C. generator set

✖



In case of D.C. machine winding, number of commutator segments is equal to______________?


anumber of armature coils

✓


bnumber of armature coil sides

✖


cnumber of armature conductors

✖


dnumber of armature turns

✖



Goto Page No.

Page 282 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