Answer / sandeep

shunt capacitor & synchronizing Motor can be operated at
leading pf (it takes leading current) .

Answer / k.prakashchandra

The above answer given by is irrelevant ,as the word
'synchronizing motor' caught me on the wrong foot.Almost all
loads are inductive and hence the pf of the system is always
lagging.To negate lagging reactive load we have to include
capacitive reactive load using either shunt capacitors or
over excited synchronous motor.

Answer / surender kumar

Sinchronous motor is used to improve power factors.

Most of our equipments & electrical machinary are inductive
load i.e. in industries,institutions,large offices &
commercial buidlings are having large electrical system .
To improve the cosine angele between voltage & current we
are puting capacitor bank & Sychronous motor.

Sub-stations are having above power factor improvement
devices.

Answer / k.prakashchandra

The synchroscope consists of two phase stator. The windings
are at right angles to one another and they are connected to
incoming generator.To have a rotating field ,the current in
one winding is made to lead the current in another by 90'
using a capacitor, as in a single phase motor.The polarising
winding in rotor (pointer) is connected to running generator.

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2 Answers   Bhel,

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low frequency protection why recomend?

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During regenerative breaking= A rotating magnetic field is reversed B slip is positive C torque is positive D slip is negative

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i HP = ?? 746 watts or 735.5 and how??

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Distinguish between neutral earthing and equipment earthing?

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