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

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

A.            of lower H.P. should be selected

B.            of higher H.P. should be selected

C.            can be used for 50°C ambient temperature also

D.            is to be derated by a factor recommended by manufacturer and select the next higher

Answer: is to be derated by a factor recommended by manufacturer and select the next higher