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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.04, 1.96
 0.02, 0.98
 0.02, 1.98

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 120 V
 175 V
 140 V
 240 V

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Electrical Machines
Which of these types of motor is used in elevators?

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

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  efficiency.
  ratio of starting to running torque.
  ratio of input to output voltage.
  ratio of starting to running current.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  vibrations.
All of these
  heating of rotor.
  double frequency currents in the rotor.

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MORE MCQ ON Electrical Machines

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