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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 3 or 4
 1
 0

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Electrical Machines
Which type motors are preferred for lathes?

 Either A or B.
 Synchronous motor.
 DC shunt motors.
 Squirrel Cage induction motor.

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Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
  insulating.
 lubrication.
  both cooling and insulation.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 ∞
 a positive finite value
 a finite negative value

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 ratings
 efficiency
 leakage reactance

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 1, 4,5
 2, 4, 5
 2, 3, 5

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