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Electrical Machines
Flashing of DC generator means
neutralization of residual magnetism.
creation of residual magnetism by a DC source.
increasing flux density by providing extra ampere-turns in field.
None of these
neutralization of residual magnetism.
creation of residual magnetism by a DC source.
increasing flux density by providing extra ampere-turns in field.
None of these
Answer
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Related Question
Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by
commutator
starters
field winding
armature winding
commutator
starters
field winding
armature winding
Answer
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Electrical Machines
An IM cannot run at synchronous speed because
rotor torque will not be produced.
induction motor will become synchronous motor.
air friction will prevent it.
none of above.
rotor torque will not be produced.
induction motor will become synchronous motor.
air friction will prevent it.
none of above.
Answer
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Electrical Machines
A smaller air gap in a polyphase induction motor helps to
reduce the magnetizing current.
reduce the chance of cogging.
increase the starting torque.
reduce the chance of crawling.
reduce the magnetizing current.
reduce the chance of cogging.
increase the starting torque.
reduce the chance of crawling.
Answer
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Electrical Machines
The commutator segments of DC machines are made up of
copper alloy
copper
brass
hard-drawn copper
copper alloy
copper
brass
hard-drawn copper
Answer
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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.
50 %.
25 %.
10 %.
15 %.
50 %.
25 %.
10 %.
15 %.
Answer
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