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



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