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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 DC machine
All of these
 Induction machine
 Synchronous machine

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC compound motor.
 DC series motor.
 DC shunt motor with armature resistance.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Stepper motors.
  Universal motors.
  Induction motors.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1500 rpm
 zero speed
 750rpm
 1000 rpm

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and high voltage
 low current and high voltage
 high current and low voltage
 low current and low voltage

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 -3.33%
 -3%
 +3%

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