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Electrical Machines
Which of the following motor has negative speed regulation?
Series motor
Cumulative compound motors
Differential compound motor
Shunt motor
Series motor
Cumulative compound motors
Differential compound motor
Shunt motor
Answer
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Related Question
Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?
Increases.
Remain unchanged
None of above.
Decreases.
Increases.
Remain unchanged
None of above.
Decreases.
Answer
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Electrical Machines
Capacitor in split phase induction motor is used to
reduce the harmonics.
improve the starting torque.
improve the power factor.
start the motor.
reduce the harmonics.
improve the starting torque.
improve the power factor.
start the motor.
Answer
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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then
wave-wound machine will have more rated current and more voltage
lap-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
wave-wound machine will have more rated voltage and less current
wave-wound machine will have more rated current and more voltage
lap-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
wave-wound machine will have more rated voltage and less current
Answer
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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?
All of these
Field winding should be properly connected to armature winding.
Field winding resistance should be less than critical resistance.
Poles should contain residual flux.
All of these
Field winding should be properly connected to armature winding.
Field winding resistance should be less than critical resistance.
Poles should contain residual flux.
Answer
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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?
10 ohm
2 ohm.
0.2 ohm
100 ohm
10 ohm
2 ohm.
0.2 ohm
100 ohm
Answer
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