Answer / bala sundaram

it will depend upon a machine.

alternator:
excitation current will increase means power factor will decrease bcoz E is increased & resultant E induced and load current phase angle is reduced so power factor reduced

synchronous motor
on over excitation it will increase a power factor.

Answer / gulshan goyal

it depends on the machine.If it is a motor and if we
increase excutation power will shift from lagging to
leading.as we increse the excitation angle will first
decrease as in lagging side than angle will increase in
leading side and hence the power factor will initially may
be .8 lagging than .9L,.95L,1 than .95 leading ,.9Ld,.8Ld

Answer / vishal

if exitation increase then power factor decrease, and if
exitation decrease then pf increace

Answer / j.ramkumar

the alternator load increase the excitation will increase
same time pf decrease we use our avr auto mode it will
maintain automatically

What are the necessary conditions for production of rotating magnetic field.

4 Answers   BARC,

---

losses in transmission lines ?

0 Answers  

---

Dear All, Can anybody please tell me which value(saturated or unsaturated) of sub-transient reactance(Xd") we take for the calculation of fault current of the system?

2 Answers  

---

If the characteristic Impedance is equal to load Impedance then…… a) voltage will be increased b) power transmission is zero c) …… d) max. power is transmission to load

2 Answers  

---

Can we use all 3 cores of a cable to connect DC motor + ve terminal and similarly one more cable for - ve terminal.

2 Answers  

---

Utility company give the supply to customer in KVA but bill them for Watt.why?

1 Answers   L&T,

---

what is a FACTS devices? what is mean by STATCOM????

1 Answers   IIT,

---

why the generator operating along with the infinte bus bar should never be under_excited?

1 Answers  

---

can we use IGBT as a AC-DC converting device in the applications?

2 Answers  

---

what happens when we apply dc to a transformer

7 Answers   Siemens,

---

How to test REF relay testing for LV panel as per Kahramaa standard?

0 Answers  

---

what is rotatng magnetic field in case of three or multiple phase alternating current machines???

1 Answers   NHPC,

---