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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes
decrease in speed demanding less armature current.
increase in speed demanding more armature current.
increase in speed but armature currnet remains the same.
decrease in speed but armature current remains the same.
decrease in speed demanding less armature current.
increase in speed demanding more armature current.
increase in speed but armature currnet remains the same.
decrease in speed but armature current remains the same.
Answer
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Related Question
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 will
Decrease.d
remains same.
none of these.
increase.
Decrease.d
remains same.
none of these.
increase.
Answer
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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to
decrease the amount of copper to be used.
increase the strength of rotor bars.
provide ease of fabrication.
reduce the magnetic hum and locking tendency of rotor.
decrease the amount of copper to be used.
increase the strength of rotor bars.
provide ease of fabrication.
reduce the magnetic hum and locking tendency of rotor.
Answer
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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to
all of these.
zero or very low voltage supply.
high filed circuit resistance.
over load.
all of these.
zero or very low voltage supply.
high filed circuit resistance.
over load.
Answer
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Electrical Machines
The brushes of a DC machine should be placed on the
commutator in the polar axis.
armature in the polar axis.
commutator in the inter polar axis.
armature midway between poles.
commutator in the polar axis.
armature in the polar axis.
commutator in the inter polar axis.
armature midway between poles.
Answer
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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?
same frequency
same phase sequence
same voltage magnitude
same prime mover speed
same frequency
same phase sequence
same voltage magnitude
same prime mover speed
Answer
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