DC Motors
The resistance of shunt field winding as compared to series field winding is

None of the listed here
Less
More
The same

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

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