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Electrical Machines
Short circuiting is caused in the armature winding due to
any of above.
failure of insulation between two turns of coil.
failure of insulation between two commutator bars.
grounding of two or more turns of the same coil.
any of above.
failure of insulation between two turns of coil.
failure of insulation between two commutator bars.
grounding of two or more turns of the same coil.
Answer
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Related Question
Electrical Machines
DC machine windings are
either of these
None of these
short pitched
full pitched
either of these
None of these
short pitched
full pitched
Answer
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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be
B - C - A or C - A - B.
C - A - B.
A - C - B.
B - C - A.
B - C - A or C - A - B.
C - A - B.
A - C - B.
B - C - A.
Answer
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Electrical Machines
Commutators in DC machines have a role of which converts
none of these.
Both AC to DC and DC to AC.
AC to DC.
high voltage DC to low voltage DC.
none of these.
Both AC to DC and DC to AC.
AC to DC.
high voltage DC to low voltage DC.
Answer
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Electrical Machines
Satisfactory commutation of DC machine requires
smooth, concentric commutator properly undercut.
brushes should smoothly run in the holders.
All of these
brushes should be of proper grade and size.
smooth, concentric commutator properly undercut.
brushes should smoothly run in the holders.
All of these
brushes should be of proper grade and size.
Answer
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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will
Oscillate around the normal speed.
Increase.
Reduce.
Remain unaltered.
Oscillate around the normal speed.
Increase.
Reduce.
Remain unaltered.
Answer
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