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Electrical Machines

Electrical Machines
The shaft of induction motor should be

  stiff.
  any of these.
  flexible.
  hollow.

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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.
 27 A.
  13.5 A.
 11.5 A.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to reduce mechanical losses.
  to reduce hysteresis loss.
  to provide better flux linkage.

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Electrical Machines
A single-winding single-phase motor has

 starting torque equal to full-load torque.
 high starting torque.
 low starting torque.
  zero starting torque.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 24.11 kW.
 26.21 kW.
 25 kW.
 23.06 kW.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Coulombs law.
 Amperes law.
 Newtons law.

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