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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 decrease
None of these
 increase
 not changed

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 2000 Volt.
 1600 Volt.
  0 Volt.
 1500 Volt.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 increase.
 remains same.
 Decrease.d
 none of these.

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Electrical Machines
Tap changer is generally provided in

 earthing transformer.
 voltage transformer.
  power transformer.
 current transformer.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 above rated speed
None of these
 below rated speed

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 eddy current loss.
  copper losses.
 hysteresis loss.
 core loses only.

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