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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  not run.
  run normally.
  get over heated.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 linearised
 any of the above
 parabola

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 234.76 N-m.
 can not be determined.
 133.22 N-m
 266.20 N-m.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 AC synchronous motor.
 cummulative compound motor.
  series motor.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 32°C.
 27°C.
  45°C.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 340 A.
 440 A.
 250 A.

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