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Electrical Machines

Electrical Machines
Slip exists in

  none of above.
  induction motor.
  synchronous motor.
  in both machines.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Split phase.
  Capacitor run.
  Repulsion.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 generator armature terminal.
 generator field terminal.
 motor field terminal.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 800 V.
 200 V.
 100 V.
 400 V.

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

All of these
 Synchronous machine
 DC machine
 Induction machine

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