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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 full load
 any of the above
 no load

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  AC slip ring motor.
  Synchronous motor.
  Single phase induction motor.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.781 Ω.
  2.241 Ω.
 25.564 Ω.
 2.74 Ω.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 570 A.
 460 A.
 340 A.

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Electrical Machines
Which of the following represents the pitch factor?

 sin (α/2)
 Cos (α/2)
 Cos α
 Cos α²

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer voltage
 high frequency supply
 rated transformer current
 direct current

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