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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 10°
 45°
 60°

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Electrical Machines
The ventilating ducts in most of DC machine are

 longitudinal.
 none of these.
 radial.
 radial as well as longitudinal.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in parallel
 in series
 either of these depending on the design of the motor
 through inductive coupling

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 remains unaffected
 decreases
 any of the above

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  repulsion start induction motor.
  transformer with secondary short circuited.
  synchronous motor.
  capacitor start induction motor.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
  DC of slip frequency.
 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.

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