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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
  pulsed wave.
 square wave.
 triangular wave.

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Electrical Machines
Which type of motors are used for lathes?

 Either A or B.
 DC shunt motors.
 Cage induction motor.
 Synchronous motor.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 permanent magnet motor
 comulatively compounded motor
 series motor

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Electrical Machines
The armature of a DC motor is laminated to reduce

 friction and windage loss.
 copper loss.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Eddy current losses
 Hysteresis losses
 Both 1 and 2

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very high.
 Very low.
 Normal.

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