Answer / raghavendran.r

pump Hydraulic power = v*d*g*h/3600000.

v = Flow rate m3/s

d = Density of fluid(kg/m3)

g = gravity (9.81 m/s)

h = differential head (m)

Shaft Power = Pump Hyd power/[Pump Eff.]

we change the speed of the synchronous motor by incresing or decreasing a rotor resistance

1 Answers  

---

what's burden resistor, why it's used?

1 Answers   Bhel, TVS Group,

---

load increase means 1 resistance increase 2 load resistance decrease 3 current increases through load 4 none of these

3 Answers  

---

i am using auto transformer for starting of induction motor to provide reduse voltages...but the principle of a tansformer according to definition"which transform energy to on circuit to another circuit with constant power and constant frequency". so if i am using reduse voltage then current obsely hige because power is same.but we use auto transfarmer for starting of induction motor to give low current.but here according to definition we are giving hige current.

0 Answers  

---

What are the conditions to be satisfied for parallel operation of dc generators?

0 Answers  

---

What is mean A32 B32 C32 D32 in mcb(miniature circuit breaker)

2 Answers  

---

How many current ratings of MCB's are in the market? e.g: 1A, 2A, .......upto.

4 Answers  

---

what is the advantage of Cathodic eathing system and what is the basic principle and how itis working, please explain clearly .

2 Answers   Meinhardt,

---

Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

1 Answers  

---

what is fault level in 66kV system?

3 Answers  

---

HOW TO CONVERT SQ MM OF A CABLE TO DIAMETER, EG. CABLE SIZE IS 185SQ.MM WHAT IS THE DIA OF THE CABLE??????????????

3 Answers   Parsons, SWAN,

---

how to calculate kA rating of device?

3 Answers   Siemens, Vijai Electricals,

---