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 H.P. motor

Correct Answer: is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor ✔

Last Updated: July 02, 2018