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Electrical Machines

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

 increase
 decrease
 not changed
None of these

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3600 rpm.
 500 rpm.
 3000 rpm.
  600 rpm.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

 Shunt.
  Compound.
  Series.
  Separately excited.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 6 V
 474 V
 240 V

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 transformer insulating oil.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
 armature circuit resistance control
 field current control
All of these

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