DC Motors
One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven

Runs as a generator
None of these
Does not run as a generator
Also runs as a motor comes to stop after sometime

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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 lower H.P. should be selected
Can be used for 50°C ambient temperature also
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

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