DC MOTORS QUIZ | EXAMIANS

Which of the following motor is preferred for operation in highly explosive atmosphere?

Battery operated motor

Shunt motor

Series motor

Air motor

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When two dc series motor are commected in parallel, the resultant speed is

Zero

Loss than the normal speed

More than the normal speed

Normal speed

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______ motor has the best speed regulation.

Shunt

Differentially compounded

Cummulative compounded

Series

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Carbon brushes are preferable to copper brushes because _____

They have lower resistance

They reduce armature reaction

They reduce sparking

They have longer life

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In variable speed motor

Same commutating field is needed at low speed than at high speed

None of these

A weaker commutating field is needed at low speed than at high speed

A stronger commutating field is needed at low speed than at high speed

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In D.C. motor which of the following can sustain the maximum temperature rise?

Slip rings

Armature winding

Field winding

Commutator

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Which D.C. motor has got maximum self loading property?

Differentially compounded motor

Cumulatively compounded motor

Shunt motor

Series motor

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A dc series motor is most suitable for

Pump

Lathes

Punch presses

Cranes

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If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking

Regenerative

None of these

Plugging

Dynamic braking

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In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be

Less than 50%

1

Anywhere between 75% and 90%

Around 90%

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