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Electrical Machines

Electrical Machines
Stepper motor is used in

 computer printers
 food processing
 traction
All of these

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in reverse direction.
  Fail to start.
  It will rotates in normal operation.
  Either short circuit or open circuit occurs.

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

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

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor start
 Capacitor run
 Shaded pole

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Electrical Machines
Example of double excited machine is

 Synchronous motor.
 DC Shunt Motor
 Both are correct.
None of these

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 100%
 reduced to half
 increase by 200%
 remain unaltered

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