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DC Motors

DC Motors
A direct on line starter is used for starting motors

Upto 5 HP
Upto 20 HP
Upto 15 HP
Upto 10 HP

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

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

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

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

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DC Motors
In a dc motor if the back emf is absent

Motor will burn
Motor will run at very high speed
Motor will not run at all
Motor will run at very slow speed

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DC Motors
Which of the following loss in a D.C. generator varies significantly with the load current?

Field copper loss
Windage loss
None of these
Armature copper loss

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DC Motors
In a dc motor constant torque is produced due to

End plates
Commutator
Rotor laminations
Pole shoes

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