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DC MOTORS

DC Motors
In the dc motor the iron losses occur in

Field
Armature
Brushes
Commutator

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DC Motors
The speed of a series motor at no load is

4000 rpm
1000 rpm
2000 rpm
Infinity

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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
The dirction of rotation of a dc series motor can be changed by

Interchanging field terminals
Either of Interchanging field or Interchanging supply
None of the listed here
Interchanging supply terminals

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DC Motors
Which of the following application requires high starting torque?

Locomotive
Centrifugal pump
Air blower
Lathe machine

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