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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 25%
 5%
 2%
 4%

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Electrical Machines
Stepper motor is used in

 food processing
 traction
 computer printers
All of these

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Closed slots.
  None of above.
  Open slots.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 970 RPM
 940 RPM
 920 RPM
 960 RPM

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  under-compounded.
  over compounded.
  shunt.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Any of above method.
  None of above.
  Ward Leonard control.
  Rheostatic control.

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