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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by
changing the load.
changing the field excitation.
varying the speed.
varying the applied voltage.
changing the load.
changing the field excitation.
varying the speed.
varying the applied voltage.
Answer
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Related Question
Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is
any of the above
zero
maximum
infinite value
any of the above
zero
maximum
infinite value
Answer
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Electrical Machines
In case of DC shunt motor if load is reduced
DC Shunt Motor
The speed will remains almost constant.
The speed will increase in proportion to reduction in load.
The speed will increase abruptly.
DC Shunt Motor
The speed will remains almost constant.
The speed will increase in proportion to reduction in load.
The speed will increase abruptly.
Answer
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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then
Ia remains constant but ωm increase
Ia increases and ωm decreses
both armature current Ia and speed ωm increase
both decrese
Ia remains constant but ωm increase
Ia increases and ωm decreses
both armature current Ia and speed ωm increase
both decrese
Answer
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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would
decrease.
not change.
None of above.
increase.
decrease.
not change.
None of above.
increase.
Answer
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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf
remains constant.
increases.
increases upto a limit and then remains almost constant.
decreases.
remains constant.
increases.
increases upto a limit and then remains almost constant.
decreases.
Answer
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