DC Motors
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

50% of the previous value
10% of the previous value
25% of the previous value
100% of the previous value

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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 lower H.P. should be selected
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

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DC Motors
The speed of a dc motor is

inversely proportional to flux per pole
inversely proportional to applied voltage
None of the listed here
Directly proportional to flux per pole

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