Electrical Engineering MCQs

Page No. 96

____________are used for construction of core of electromagnets?


a Soft magnetic materials


bHard magnetic materials


c Either A. or B.


dNone of the above



Tractive magnets are operated from____________?


aa.c. supply


bd.c. supply


ceither a.c. or d.c. supply


d. none of the above. none of the above


View Answer . none of the above

Which of the following is the commonly used type of electromagnets ?


aFlat-faced armature type


bHorse shoe type


cFlat-faced plunger type


dAll of the above


View Answer All of the above

The design of electromagnets is based upon which of the following fundamental equations ?


aForce equation


b Magnetic circuit equation


cHeating equation


dAll of the above


View Answer All of the above

electromagnets generally function as holding magnets ?


a Tractive


bPortative


cEither of the above


d None of the above


View Answer Portative

By which of the following methods motor rating for variable load drives can be determined ?


a Method of average losses


bEquivalent current method


cEquivalent torque method


dAll of the above


View Answer All of the above

The value of exciting or magnetizing current depends upon which of the following factors ?


a. Total m.m.f. required


bThe number of turns in the exciting winding


cThe way in which the winding is distributed


d All of the above


View Answer All of the above

Which of the following methods is used for air cooling of turbo-alternators ?


aOne sided axial ventilation


bTwo sided axial ventilation


cMultiple inlet system


dAll of the above


View Answer All of the above

By which of the following methods the temperature rise of windings and other parts may be determined ?


aThermometer method


b Resistance method


c Embedded temperature detector method


dAny of the above


View Answer Any of the above

The slot leakage can be calculated by making which of the following assumptions ?


aThe current in the slot conductors is uniformly distributed over their cross-section


b The leakage path is straight across the slot and around the iron at the bottom


cThe permanence of air paths is only considered. The reluctance of iron paths is assumed as zero


dAll of the above


View Answer All of the above

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