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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 3/4.
 9/16.
 16/9.

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  phosphor bronze.
  aluminium.
  carbon.

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 60 Hz
 40 HZ
 50 Hz

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 Proportional to the armature current.
 None of above.
 Inversely proportional to the armature current.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
 damping torque.
 synchronizing power co efficient.
  restoring torque.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 200 V.
 400 V.
 800 V.
 100 V.

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