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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to
increase pull out torque
improve starting torque
reduce magnetising current and improve power factor
decrease starting torque
increase pull out torque
improve starting torque
reduce magnetising current and improve power factor
decrease starting torque
Answer
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Related Question
Electrical Machines
In a DC generator the emf generated by the armature is maximum when
induced voltage is high.
rate of change of flux is minimum.
rate of change of flux is maximum.
shaft rotation is high.
induced voltage is high.
rate of change of flux is minimum.
rate of change of flux is maximum.
shaft rotation is high.
Answer
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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?
Rotation can be changed by interchanging supply terminals.
Direction of rotation cannot be changed.
None of these.
Rotation can be changed by reversing main winding terminals.
Rotation can be changed by interchanging supply terminals.
Direction of rotation cannot be changed.
None of these.
Rotation can be changed by reversing main winding terminals.
Answer
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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.
74 Nm.
65.8 Nm.
27.73 Nm .
38.5 Nm.
74 Nm.
65.8 Nm.
27.73 Nm .
38.5 Nm.
Answer
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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)
changes to 0.5 times the original value
changes to three times the original value
remain the same as the original
changes to 1.5 times the original value
changes to 0.5 times the original value
changes to three times the original value
remain the same as the original
changes to 1.5 times the original value
Answer
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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?
All of these
RBY
BYR
BRY
All of these
RBY
BYR
BRY
Answer
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