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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Eddy current loss
 Magnetic loss
 Hysteresis loss

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 reluctance of core.
 iron loss.
 volume of iron.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 current.
 power.
 torque.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  None of these.
  120 volt.
  218.5 volt.

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide protection against Low-Voltage.
 limit the starting current to a safer value.
 provide overload protection.

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