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DC Motors

DC Motors
In the dc motor the iron losses occur in

Brushes
Commutator
Armature
Field

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DC Motors
The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is

6.77%
4.76%
8.85%
2.22%

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DC Motors
Dc series motors are used in those applications where _____ is required.

None of the listed here
Low no load speed
High starting torque
Constant speed

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DC Motors
During rheostat braking of dc series motor

Motor is run as a generator
Motor is run at reduced speed
None of the listed here
Motor is reversed in direction

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

More than full-load current
Almost negligible
Less than full-load current
Rated full-load current

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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.

None of the listed here
Twice
Half
One-third

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