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Electrical Machines

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%
 -3.33%
 -3%
 +3.33%

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

  10°.
 24°.
 45°.
 30°.

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 copper
 brass
 copper alloy

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Eg vs Ia
 Eg vs load current
 Vt vs load current

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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.

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

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

None of these
 Split phase motor.
  PSC (permanent split capacitor) motor.
 Shaded pole motor.

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