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Electrical Machines
The condition for maximum running torque is
zero
unity
0.5 lagging
0.707 lagging
R = S.X
zero
unity
0.5 lagging
0.707 lagging
R = S.X
Answer
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Related Question
Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.
damping torque.
restoring torque.
mechanical rotatory system.
synchronizing power co efficient.
damping torque.
restoring torque.
mechanical rotatory system.
synchronizing power co efficient.
Answer
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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
Decrease.
Remains same.
Increase.
None of these.
Decrease.
Remains same.
Increase.
None of these.
Answer
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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is
cumulatively compounded.
shunt connected.
differentially compounded.
separately excited.
cumulatively compounded.
shunt connected.
differentially compounded.
separately excited.
Answer
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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?
All of these
compensating winding
pole stacking
pole chamfering
All of these
compensating winding
pole stacking
pole chamfering
Answer
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Electrical Machines
Secondary winding of an auto transformer is also called
damping winding.
compensating winding.
tertiary winding.
common winding.
damping winding.
compensating winding.
tertiary winding.
common winding.
Answer
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