Answer / ramky

cosine of the angle b/w voltage and current is nothing but
the power factor. it is very use full in a.c systems , by
using this we can measure active power

Answer / masoom raza

its cosine of angle between voltage and current of the given system.
its present in both ac and dc circuit but in case of dc its always 1 as angle between voltage and current in this case is always 0 degree.so generally we don't talk about pf in dc.
but in case of ac it varies from 0 to 1.

Answer / jai ganesh

Mr.Pillay
In capacitive load the power factor is leading.
In inductive load the power factor is lagging.

Answer / monika hassan.

Power factor is the ratio of true power or watts to
apparent power or volt amps

Answer / pillay

to make a long storey short Ramky & monika have answered.It is present only in AC circuits.
it is used for the calculation of real power from apparent power.Gives you an idea how capacitive or inductive is a load.

Input power is 380 - 450 V but with 45 - 55 Hz frequency - desired output is 415 V and 50hz with 1% variation permissible. CVT / Servo dont stabilize the Frequency - what is best solution??

7 Answers   IOCL,

---

bus bar design conditions and sizing pls tell me quickly

0 Answers  

---

Which state of India had first started power reforms?

1 Answers  

---

Give some differences between open loop and closed loop control systems.

0 Answers   GE,

---

what is the harmonics.

3 Answers   DLF,

---

---

what is ATS?and its function or operation in power system with its layout.

1 Answers   DLF,

---

What is difference between VCB and SF6 breaker

4 Answers  

---

What is difference between Step Up Transformer & Booster Transformer? can we used instead of any one?

2 Answers   CS,

---

a.)Ammeter and Voltmeter read rms value or avg. value ? b.)What are symmetrical and Unsymmetrical faults?

2 Answers  

---

What is the min.& max distance between two earth spikes is required for measuring earth resistance of an earth pit? Is the manufacturer of Earth tester decides this? Pls explain.

3 Answers   ABB, HAL,

---

Explain (in simple ) - root mean square. whats its role in electrical fundamandal.where its used

0 Answers   MRF, PPCL,

---

How works the AVR in DG Sets Plz explain??????????

1 Answers  

---