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

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

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DC Motors
In a dc compound machine,

Shunt field winding plays dominant role
Series field winding plays dominant role
Both play equally dominant role
Either can play dominant role

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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

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
Of lower H.P. should be selected

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