Answer / kunal

by varying the voltage
as per V/f ratio

Answer / sss

frequeny of a transmission line is varied by changing the synchronous speed of the generator.....which is affected by the equation syn.speed=(120f)/p...so the frequency of the transmission line is varied by changing the poles of the generator...........
however the frequency cannot be maintained as a constant one throughout....it has a slight variation of +/- ...but if there is huge variation the power station tries to decrease/increase the load there by maintaining the frequency as a constant one

How seriving & testing of the HT & LT breakers are done. What are the standard Ir values on which we can come to know the test is passed or failed?

0 Answers  

---

What is Earth Fault and Over current Fault.

1 Answers  

---

can we calculate the diameter of the cable by its cross section?

1 Answers  

---

Why does the speed regulating system adopting I controller have no steady-state error? In this single closed-loop speed regulating system, when the input of the I controller Un=0, what is the output voltage of the regulator? What factors do the output voltage depend on?

0 Answers   Sterling Wilson,

---

wat is d diffr btw shunt coil and trip coil in VCB?

0 Answers   NTPC,

---

How many types of timer ?which timer are used star delta feeder

1 Answers   BMM Ispat,

---

If cvt is most advance & effective(economically & stability)so why not use instead of VT(11 kv & 33 kv)?

3 Answers  

---

What is the male and female contactors.where is it's used and what is the deferent betweens

1 Answers   Standard Chartered,

---

In siemens PLC, why do we want to move the data ?

0 Answers  

---

what is meant by distance protection ? how distance protection relay function ?

1 Answers   ABB,

---

What is the life of MCCB

1 Answers   Siemens,

---

why we use condenser in the thermal power plant, althrough the same vapour will be again heated

2 Answers  

---