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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 unity
 leading
 zero

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
 mechanical rotatory system.
 synchronizing power co efficient.
  restoring torque.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 All of the them
 Hysteresis losses
 Eddy current losses

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 Ω
 6 Ω
 2.2 Ω
 1.9 Ω

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 above rated speed.
 below rated speed.
 in both direction.

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

 no load
 any of the above
 half load
 full load

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