DC Motors
In a dc machines the residual magnetism is of the order of

50 to 75 percent
2 to 3 percent
20 to 25 percent
10 to 15 percent

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

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