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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 36°
 18°
 72°

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 440 A.
 400 A.
 44 A.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 16.55 Nm
 15.6 Nm
 15.92 Nm
 15.28 Nm

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Electrical Machines
DC shunt motors are suitable for

  All of this.
 Blowers and fans.
 Lathes.
 Centrifugal pumps

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Shunt motor.
  Differential compound motor.
  Series motor.
  Cumulative compound motor.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

  more than core loss.
 less than core loss.
 equal to core loss.
 zero.

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