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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Rotating part of DC motor is known as

 Carbone brush.
 Pole.
 Armature.
 Starter.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 400W
 300 W
 500 W
 250 W

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid over heating.
 to avoid locking of the armature.
All of these
 to achieve a stronger magnetic field.

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 reduce eddy current loss
 collecting of voltage
 collecting of current without any sparkings

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)2 × full Load.
 (Pi / Pc) × full Load.
 (Pi / Pc)1.6 × full Load.
  (Pi / Pc)0.5 × Full Load.

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