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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 flat-topped
 co- sinusoidal
 sinusoidal

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 301 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  run in a direction opposite to previous one.
  continue running in the same direction as before.
  not run.

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Electrical Machines
For standing a DC motor a starter is required because

None of these
  it limits the starting current to a safe value.
  it limits the speed of the motor.
  It starts the motor.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply frequency
 rotor resistance
 supply voltage

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Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
None of these
 both A and B
 flux(φ)

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MORE MCQ ON Electrical Machines

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