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DC Motors

DC Motors
In the dc motor the iron losses occur in

Armature
Brushes
Field
Commutator

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DC Motors
A dc series motor is that which

Has almost constant speed
Has a poor torque
Has its field winding consisting of thick wire and less turns
Can be started easily without load

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DC Motors
The running speed of a dc series motor is basically determined by

Armature reaction
Field excitation
None of the listed here
Load

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DC Motors
Which of the following losses are significantly reduced by laminating the core of a D.C. generator?

Eddy current losses
Windage losses
Hysteresis losses
Copper losses

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DC Motors
The mechanical power developed in a dc motor is maximum when back emf is equal to _____ the applied voltage.

One-third
Half
Twice
None of the listed here

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DC Motors
In D.C. shunt motors as load is reduced

The speed will increase in proportion to reduction in load
The speed will remain almost/constant
The speed will reduce
The speed will increase abruptly

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