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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC shunt motors.
 DC series motors.
None of these

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature midway between poles.
 armature in the polar axis.
 commutator in the inter polar axis.
 commutator in the polar axis.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
None of these
 The leakage reactance of the induction motor should be small.
 Both 1 and 2.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

None of these
 back to back test
 OC and SC tests
 load test

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Electrical Machines
Rotating part of DC motor is known as

 Carbone brush.
 Starter.
 Armature.
 Pole.

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Electrical Machines
Which type of motors uses slip rings?

 Synchronous motors
 DC Shunt Motor
 Both Synchronous and Induction motor
 Induction motors

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