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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 -0.08
 -1.92
 0.08

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque decreases
 less and maximum torque decreases
 less and maximum torque increases
 more and maximum torque remains constant

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

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

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Electrical Machines
Induction motors provided with open slots have

  leading power factor.
  higher efficiency.
  less breakdown torque.
  more breakdown torque.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3600 rpm.
 500 rpm.
 3000 rpm.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 Synchronous motor.
 DC Shunt Motor
 AC single phase motor.

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