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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Armature.
 Coupling mounted on the shaft.
 Field.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the starting current will be enormously high.
 the motor may run away.
 the motor may not start.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced iron loss.
 Reduced copper loss.
  Decrease in weight/KVA.
 Increase in weight/KVA.

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Electrical Machines
Which of the following motor used in hair dryers?

  Shaded pole IM.
  Cage induction motor.
  Split phase IM.
  Synchronous motors.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
 not changed
None of these

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 DC series generator.
 DC shunt generator.
 None of these.

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MORE MCQ ON Electrical Machines

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