Answer / umair

power factor is actually the measure of the degree to which
a given load matches to that of a pure resistance.
Power factor actually gives the percentage of real power
supplied.If it is .85 it means that a given the supplied
power is 85% useful which is known to be the active and 15%
reactive which is not useful.

Answer / sandip upare

Power factor means cos of angle between real power and
active power (kw and kvah)and it should be 90 deg. that
means,power factor is unity.
Now if the angle comes down below 90 deg. the rective power
(kvarh)increases and that means your company pay extra
money for that power which we not use that is only losses
because in low power factor current lead voltage and due to
this copper losses increase and ultimately consumption
increase.
Finally purpose of finding power factor daily in any
company is that
1) To minimise the unwanted consumption
2) avoid heat losses and improving equipment life
3) and Electricity Board gives 7 per. discount in every
monthy bill if we maintain unity PF through out the month
but for that capacitor bank are required as per the load

Answer / mani

power factor is high at that time larger current from it so
maintain asuitable limit

is starting current of induction is high or stating current of ransformor is hign ,for the same rating

12 Answers   BARC,

---

How can we have to decided motor connection as a STAR-DELTA or DELTA-STAR?

3 Answers   IOCL, Jindal,

---

how can we change the polarity of Alternating current rapidly? how frequency of ac can be controlled and changed easily?

0 Answers  

---

what is the meaning of transformer short circuit test?

7 Answers   HZL, L&T,

---

What is K-rated transformer? What is the use of it? What can be the size(pls provide calculation if possible) of K- factor transformer for 550kW,690V motor operating with drive (VFD)?

0 Answers  

---

L&T ACB C-POWER OF 800A FAULS TRIPING AT THE TIME OF 110KW MOTOR STARTS WITH EARTH FAULT RELEASE

1 Answers   Ambuja,

---

what is physical distance of isolator to VCB in 33/11kv sub stations

0 Answers   Enercon,

---

what is cogging and crawling

20 Answers   ABB, Ashok Leyland, Bharat Bijlee, BMRCL, MN Dastur, Siemens,

---

What is water cooled chiller plant?

1 Answers   Gulf, IOCL,

---

3 measuring instrument for transformers?

5 Answers  

---

Whats difference between a single phase & a three phase motor?

4 Answers  

---

why we use mostly 3-phase but not 4-phase and 5-phase what is the difference between them

1 Answers  

---