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

4.76%
8.85%
6.77%
2.22%

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DC Motors
In variable speed motor

Same commutating field is needed at low speed than at high speed
A stronger commutating field is needed at low speed than at high speed
A weaker commutating field is needed at low speed than at high speed
None of these

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