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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  1.
  0.54.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Cummulative compound motor.
 Shunt motor.
 Differential compound motor.
 Series motor.

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Electrical Machines
Dynamic braking is employed to brake

None of these
 non reversing drive
 reversing drive
 both 1 and 2

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Electrical Machines
Which of the following statements are correct ?

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

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P*ωm
 ωe = ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm

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

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

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