DC Motors
For starting a dc motor a starter is required because

None of the listed here
It limits the speed of the motor
It starts the motor
It limits the starting current to a safe 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

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
Can be used for 50°C ambient temperature also

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