DC Motors
In D.C. shunt motors as load is reduced

The speed will increase abruptly
The speed will increase in proportion to reduction in load
The speed will reduce
The speed will remain almost/constant

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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

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

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