Electrical Engineering MCQs

Page No. 258

Hysteresis motor is particularly useful for high-quality record players and tape-recorders because___________?


ait revolves synchronously

✖


bit is not subject to any magnetic or mechanical vibrations

✖


c it can be easily manufactured in extremely small sizes of up to 1 W output

✖


d it develops hysteresis torque which is extremely steady both in amplitude and phase

✓



Which of the following statements regarding single-phase induction motors correct?


a It requires only one winding

✖


bIt can rotate in one direction only

✖


c It is self-starting

✖


dIt is not self-starting

✓



Speed control of a universal motor is achieved by__________?


avarying field flux with tapped field windings

✖


b connecting rheostat in series

✖


capplying variable voltage by means of silicon controlled rectifier

✖


d all of the above methods

✓



Which of the following statements regarding hysteresis motor is in incorrect?


aIt is extremely sensitive to fluctuations in supply voltage

✓


bIts high starting torque is due to its high rotor hysteresis loss

✖


c It is extremely quiet in operation

✖


dIt accelerates from rest to full-speed almost instantaneously

✖



The starting winding of a single-phase motor is placed in_________?


aarmature

✖


bfield

✖


c rotor

✖


dstator

✓


View Answer stator

The speed of a universal motor is usually reduced by using____________?


agearing

✓


b belts

✖


cbrakes

✖


d chains

✖


View Answer gearing

A reluctance motor____________?


ais self-starting

✖


b is constant speed motor

✖


cneeds no D.C. excitation

✖


dall of the above

✓


View Answer all of the above

Which motor is normally free from mechanical and magnetic vibrations ?


aSplit phase motor

✖


b Universal motor

✖


cHysteresis motor

✓


dShaded pole motor

✖


View Answer Hysteresis motor

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?


afans

✖


bblowers

✖


csound equipment

✓


dmixer grinders

✖


View Answer sound equipment

The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?


aarmature winding

✖


bfield winding

✖


ceither armature winding or field winding

✓


dnone of the above

✖



Goto Page No.

Page 258 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