Is it possible to use AC supply insted of DC supply in trip coil operation? if not, why?

5 Answers   HAL,

---

Explain why the Voltage drop will happen in 3 Phase line?

2 Answers  

---

why transformer comes only in standard rating like 11kv,33kv,66kv....and not like 33.33kv and so on?

3 Answers  

---

what is the range of thermal overload and over current. Answer should be in percentage of current.

0 Answers   RMSI,

---

In india the power supply is always in multiple of 11, eg.220 V, 440 V... what is the reason?

11 Answers   BSES, Electrical, L&T, PSIT,

---

what is preventive maintenance? and what is predictive maintenance? and what diffrence both?

3 Answers   Volkswagen,

---

can we check the resistance of earthing electrode while it is connected with the neutral of UPS system

3 Answers  

---

why are the likely reasons for bochholz & pressure relays oprate due to a internal fault but not differential relay ?

2 Answers  

---

why induction motors are of lagging type and not leading type

9 Answers   Bhel,

---

what is basically a pulse transformer?

1 Answers  

---

Do I need a special Transformer to put 240 VAC 3 phase into it and and get 480 VAC 3 phase out of it to run a machine? Or, do I just use an ordinary step down transformer and step up the voltage? Thanks

2 Answers  

---

what is formula of illumation calculation

0 Answers  

---