Electrical Engineering MCQs

Page No. 290

In a manual shunt motor starter?


aover load relay is connected in series and no volt relay in parallel with the load

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bover load relay is connected in parallel and no volt relay in series with the load

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c over load relay and no volt relay are both connected in series with the load

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dover load relay and no volt relay are both connected in parallel with the load

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D.C. shunt motors are used for driving____________?


atrains

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bcranes

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choists

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dmachine tools

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View Answer machine tools

Torque developed by a D.C. motor depends upon_____________?


amagnetic field

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bactive length of the conductor

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ccurrent flow through the conductors

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dall above factors

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View Answer all above factors

Which of the following loss in a D.C. generator varies significantly with the load current ?


aField copper loss

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bWindage loss

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c Armature copper loss

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dNone of the above

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The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?


ahysteresis loss

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bfield copper loss

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carmature copper loss

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d eddy current loss

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View Answer armature copper loss

In a D.C. generator all of the following could be the effects of iron losses except___________?


aLoss of efficiency

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b Excessive heating of core

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c Increase in terminal voltage

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d Rise in temperature of ventilating air

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The hysteresis loss in a D.C. machine least depends on____________?


aFrequency of magnetic reversals

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bMaximum value of flux density

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cVolume and grade of iron

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dRate of flow of ventilating air

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Regenerative method of braking is based on that___________?


aback e.m.f. is less than the applied voltage

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bback e.m.f. is equal to the applied voltage

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cback e.m.f. of rotor is more than the applied voltage

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dnone of the above

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The main disadvantage of the Ward-Leonard control method is______________?


ahigh initial cost

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bhigh maintenance cost

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clow efficiency at Hght loads

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dall of the above

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View Answer all of the above

In Ward-Leonard control the lower limit of speed is imposed by________?


aresidual magnetism of the generator

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bcore losses of motor

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cmechanical losses of motor and generator together

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dall of the above

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