Answer / shalini.b

Power factor is the cosine of angle between voltage &
current.i.e cos(phi)
or
It is the ratio of Active power to reactive power
cos(phi)=KW/KVA

Answer / suhas yeole

it is the ratio of active power to the apperent
power,i.e. cos(Q)=kw/kva

Answer / bijay

To Chetan,
Suppose u got 80 out 0f 100 in an exam.
this means u r at a pf of 0.8, the class topper got 95, so
his PF is 0.95.

Now note that KVA is ur total marks(100)
and KW is what u scored.

now its simple pf=kw/kva

Answer / sudheer

Mr.bijay you are good explainer.
please share this knowledge to every-body.

Answer / mehdi

In the above:

cos(phi)=PF= KW/KVA formula is correct.

but KVA is apparent power not reactive power.

KVA= V*I ,
KW=V*I*cos(phi) ,
KVAR= V*I*sin(phi)

KVA=apparent power=Sqrt(KW*KW + KVAR*KVAR)

Answer / anusree

Efficiency of utilisation of a power supply, higher the pf
better is the efficiency, pf is the ratio of active power
to reactive power

What is OLTC in a transformer, specify its fuction.

35 Answers   Bhel, Isgec, L&T,

what kind of material to be used after ngr unit? cu or GI

1 Answers   Michelin,

If a fan get trip and run in reverse direction due to system flow. Now in this condition during starting how can a VFD bring this negative speed to zero and later run in forward direction?

2 Answers   Aditya Birla, Siemens,

11/.433KV, 100KVA TRANSFORMER is supplied with .433KV AT ITS PRIMARY. HOW MUCH KVA IT CAN SUPPLY

8 Answers   ABB,

Why you are switching off arc protection mcb when you are taking shutdown for lv board.

0 Answers   KSEB, L&T, Siemens,

what is the equation of insulating resistance of motor???

1 Answers   Birla,

Define the overload capacity of the motor.

3 Answers   Alstom, Maynilad,

what is the formulae for calculating the cable size for a given voltage and current.

4 Answers   Bharat Forge,

Define characteristics impedance?

0 Answers  

what is the use of vcb & isolator in substation?

4 Answers  

What are the earthing required for commissionthe DG Set?

2 Answers   HSL,

OHMS Law is only applicable for ac or dc or both circuiT?.

6 Answers