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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
 1.5 %.
  zero.
 4 %.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 650 W
 600 W
 700 W
 625 W

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
None of these
 both 1 and 2
 power factor of load

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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
Dynamic braking is employed to brake

None of these
 non reversing drive
 both 1 and 2
 reversing drive

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC compound motor.
 DC series motor.
 DC shunt motor with armature resistance control.

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