DC MOTORS QUIZ

The compensating winding is connected in

Series with armature

None of the listed here

Parallel with armature

Series-parallel with armature

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A dc series motor is best suited for driving

Cranes and hoists

Machine tools

Shear and punches

None of the listed here

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The plugging gives the

None of the listed here

Smallest torque braking

Highest torque braking

Zero torque braking

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The back emf in a dc motor ______

Aids the applied voltage

Aids the armature current

None of the listed here

Opposes the applied voltage

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If a dc motor is to be selected for conveyors, which motor would be preferred?

Shunt motor

Differentially compound motor

Series motor

Cummulative compound motor

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Compensating winding in a dc machine is placed

On yoke in the interpolar gap

None of the listed here

On armature

On yoke in the pole faces

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The torque developed by a dc motor is directly proportional to

Flux per pole × armature current

Armature resistance × applied voltage

None of the listed here

Armature resistance × armature current

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The dirction of rotation of a dc series motor can be changed by

None of the listed here

Interchanging supply terminals

Either of Interchanging field or Interchanging supply

Interchanging field terminals

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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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Motor starter are essential for

Preventing fuse blowing

Starting the motor

Accelerating the motor

Avoiding excessive starting current

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