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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 no load
 any of the above
 half load

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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

  0.24 Ω.
 0.45 Ω.
 0.66 Ω.
 0.78 Ω.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 no load voltage and field current
 short circuit current and field current
 short circuit current and armature current

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 Ns
 Nr
 S.Ns

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  sipper.
  rotor can not have any laminations.
  thinner.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Resistance split phase motor
 Capacitor start capacitor run motor
All of these

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