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DC Motors

DC Motors
A dc series motor is most suitable for

Pump
Lathes
Punch presses
Cranes

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

Slip rings
Field winding
Commutator
Armature winding

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DC Motors
Carbon brushes are preferable to copper brushes because _____

They have lower resistance
They have longer life
They reduce sparking
They reduce armature reaction

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DC Motors
If a dc motor is comnected across the AC supply it will

Run at lower speed
Not run
Run at normal speed
Burn due to heat produced in the field winding by eddy currents

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

Drum type controller is used
Four point starter is used
All above can be used
Three point starter is used

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

Around 90%
Anywhere between 75% and 90%
Less than 50%
1

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