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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 0 < S < 1
 -2 < S < 2
 -1 < S < 1

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Electrical Machines
A DC generator can be considered as

 power pump.
 rectifier.
 rotating amplifier.
 prime mover.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 1.8 9 Ω
 3.1 Ω
 2 .1 Ω

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Electrical Machines
High starting torque and low starting current is the advantage of

  slip ring induction motor.
  stepper motor.
  squirrel cage induction motor.
  hysteresis motor.

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Electrical Machines
The application that need frequent starting and stopping is

  lifts and hoists.
  jaw crushers.
  blowers.
  paper mills.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 30 W.
 25 W.
 28 W.

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