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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  low.
  medium.
  high.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.5.
  0.05.
  1.0.

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.45 Ω.
 0.66 Ω.
  0.24 Ω.
 0.78 Ω.

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Electrical Machines
Compensating winding is placed in the

All of these
 armature core
 pole shoe
 main field

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Electrical Machines
Lamination of core are generally made of

 carbon.
 cast iron.
 stainless steel.
 silicon steel.

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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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