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DC Motors

DC Motors
In the dc motor the iron losses occur in

Armature
Field
Commutator
Brushes

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DC Motors
Three point starter can be used for

Shunt motor only
Series motor only
Compound motor only
Both shunt and compound motor

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DC Motors
The maximum end play of a motor is about

0.4 mm
6 mm
10 mm
2 mm

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DC Motors
At the instant of starting when a D.C. motor is put on supply, it behaves like

None of these
A low resistance circuit
A capacitive circuit
A highly resistive circuit

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DC Motors
These days dc motors are widely used in

Machine shops
Electric traction
Pumping sets
Air compressors

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DC Motors
If conditions for maximum power for a dc motor are established, the efficiency of the motor will be

80 to 90 %
Less than 50%
60 to 70 %
100 %

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MORE MCQ ON DC Motors

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