DC MOTORS QUIZ

The main disadvantage of the Ward-Leonard control method is

All of these

High initial cost

High maintenance cost

Low efficiency at high loads

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In a dc compound machine,

Shunt field winding plays dominant role

Series field winding plays dominant role

Either can play dominant role

Both play equally dominant role

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In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be

Rated full-load current

More than full-load current

Less than full-load current

Almost negligible

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D.C. series motors are used

Where constant operating speed is needed

None of these

Where load changes frequently

Where load is constant

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A direct on line starter is used for starting motors

Upto 15 HP

Upto 10 HP

Upto 20 HP

Upto 5 HP

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Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control

Three point starter is used

All above can be used

Four point starter is used

Drum type controller is used

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Which of the following motor has the poorest speed regulation?

Differentially compound motor

Series motor

Shunt motor

Cummulative compound motor

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A dc motor can be easily identified by

Winding

Size of conductor

Yoke

Commutator

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Ward-Leonard control is basically a

Armature resistance control method

Field control method

Voltage control method

Field divertor method

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

Field copper loss

Armature copper loss

Windage loss

None of these

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