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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  constant.
  maximum.
  variable.
  minimum.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 No load.
 None of these.
 Low load.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 440 A.
 40 A.
 400 A.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

All of these
 3 point starter
 4 point starter
 2 point starter

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  high staring torque only.
  high staring torque and high power factor.
  none.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 open circuit and short circuit tests.
 short circuit and slip tests.
 open circuit and zero power factor tests.

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