DC Motors
The back emf in a dc motor ______

None of the listed here
Opposes the applied voltage
Aids the armature current
Aids the applied voltage

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DC Motors
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor

Of higher H.P. should be selected
Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor
Can be used for 50°C ambient temperature also
Of lower H.P. should be selected

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