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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 1/V
 V²
 1/V²

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
 20 N.
  None of these.
  15 N.

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

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

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Electrical Machines
Which of the following statements are correct ?

None of these
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.
 A small value of leakage reactance will increase the maximum power output of motor.

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Electrical Machines
Breadth factor is defined as the ratio of

None of these
 emf with distributed winding to emf with concentrated winding.
 both 1 and 2.
 emf with concentrated winding to emf with distributed winding.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 4000 rpm
 1500 rpm
 3000 rpm

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