![If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor](https://www.gkseries.com/blog/wp-content/uploads/2022/04/If-a-D.C.-motor-designed-for-40°C-ambient-temperature-is-to-be-used-for-50°C-ambient-temperature-then-the-motor.png)
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