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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T∝ V²
 T ∝ 1/V
 T ∝ V

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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?

 45°.
 24°.
  10°.
 30°.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 same.
 different.
 none of above.
 changes.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 less than primary.
 any of the above.
 equal to primary.
 greater than the primary.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  transformer.
  asynchronous motor.
  repulsion motor.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 200 rpm.
 2166.67V, 230 rpm.
 541.67V, 250 rpm.
 2166.67V, 270 rpm.

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