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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

 Conservator tank.
  Commutator.
 Tap changer.
 Radiator.

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Electrical Machines
No load saturation characteristics are plotted between

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

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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

 Increase.
 Remains same.
  Decrease.
 None of these.

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

 not changed
 decrease
None of these
 increase

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Electrical Machines
The commutator segments of DC machines are made up of

 copper
 brass
 copper alloy
 hard-drawn copper

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 zero
 1500 rpm
 1470 rpm

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