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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 GNA
 either GNA or MNA
 MNA

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor shunt regulator.
  Transistor series regulator.
None of these
  Zener diode shunt regulator.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Stepper motors.
  Reluctance motors.
  Induction motors.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  Same as full load.
  High.
  Equal to 1.

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Electrical Machines
DC machine is a

 both are correct.
 none of above are correct.
 conduction machine.
 convection machine.

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Electrical Machines
Which type of motors are preferred in lifts?

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

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