Electrical Engineering MCQs

Page No. 96

____________are used for construction of core of electromagnets?


a Soft magnetic materials

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bHard magnetic materials

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c Either A. or B.

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dNone of the above

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Tractive magnets are operated from____________?


aa.c. supply

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bd.c. supply

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ceither a.c. or d.c. supply

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d. none of the above. none of the above

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View Answer . none of the above

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


aFlat-faced armature type

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bHorse shoe type

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cFlat-faced plunger type

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dAll of the above

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View Answer All of the above

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


aForce equation

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b Magnetic circuit equation

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cHeating equation

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dAll of the above

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View Answer All of the above

electromagnets generally function as holding magnets ?


a Tractive

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bPortative

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cEither of the above

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d None of the above

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View Answer Portative

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


a Method of average losses

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bEquivalent current method

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cEquivalent torque method

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dAll of the above

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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

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bThe number of turns in the exciting winding

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cThe way in which the winding is distributed

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d All of the above

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View Answer All of the above

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


aOne sided axial ventilation

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bTwo sided axial ventilation

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cMultiple inlet system

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dAll of the above

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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

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b Resistance method

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c Embedded temperature detector method

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dAny of the above

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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

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

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

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dAll of the above

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View Answer All of the above

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