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Electrical Machines

Electrical Machines
Diverters are used only in

 either of these
 series motors
None of these
 shunt motors

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 DC motor.
  1 - Φ synchronous motor.
 Stepper motor.
 3 - Φ induction motor.

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Electrical Machines
Copper brushes in DC machine are used

 where low voltage and high currents are involved.
 where high voltage and low current.
None of these
 in both of above cases.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
  33.33 Amp.
 29 Amp.
  43 Amp.

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Electrical Machines
The functions of inter poles are

 nullify reactance voltage and improve the commutation.
 reduce cross magnetization effect and improve commutation
 both 1 and 2
None of these

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt, compound and series motor.
  Shunt motor.
  Shunt motor as well as compound motors.
  Series motor.

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