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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

 3/4.
 16/9.
 4/3.
 9/16.

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Electrical Machines
Induction motors provided with open slots have

  more breakdown torque.
  less breakdown torque.
  leading power factor.
  higher efficiency.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Blowers.
 Air compressors.
  Conveyers.
 Centrifugal pumps.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of transformer oil.
 condition of bushings.
 condition of bushing stud.
  condition of transformer.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 50, 1500.
 1440, 1500.
 60, 1440.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 30 volts.
 10 volts.
 40 volts.

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