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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?

 45°
 30°
 60°
 10°

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  hysteresis losses.
  eddy current losses.
  ohmic losses.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 6 V
 220 V
 more than 220 V
 somewhat less than 220 V

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Any of above.
 Armature voltage control.
 Armature resistance control.
 Shunt field resistance control.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = ωm
 ωe = P*ωm
 ωe = 2/P*ωm

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  equalizer rings.
 graphite brushes.
  commutator with large number of segments.
  carbon brushes.

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