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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
  zero.
 1.5 %.
  less than 1 %.

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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.

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

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
 shaft rotation is high.
  rate of change of flux is maximum.
 rate of change of flux is minimum.

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Electrical Machines
Ward Leonard control is provides speed control

  In both direction.
  Above rated speed.
  In one direction only.
  Below rated speed.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 23 A.
 11.5 A.
 27 A.
  13.5 A.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
  1 mg of KOH / gm.
 0.5 mg of KOH / gm.
 2 mg of KOH / gm.

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