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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC series motors.
 DC compound motors.
None of these

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  level compound.
  shunt generator.
 series generator.
  short - shunt generator.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Synchronous motor.
 AC single phase motor.
 Induction motor.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 240 A.
 173 A.
 127 A.

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

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

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 0 KVA
 6 KVA
 10 KVA

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