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DC Motors

DC Motors
Dc shunt motors are used for driving

Hoist
Trains
Machine tools
Cranes

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DC Motors
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

50% of the previous value
100% of the previous value
10% of the previous value
25% of the previous value

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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

2.22%
4.76%
6.77%
8.85%

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DC Motors
Which of the following in a dc motor, can sustain the maximum temperature rise?

Field winding
Armature winding
Commutator
Slip rings

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DC Motors
Which of the following loss in a D.C. generator varies significantly with the load current?

Field copper loss
None of these
Windage loss
Armature copper loss

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DC Motors
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?

Brake test
Hopkinson's test
Field test
Swinburne's test

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