what kind of motors are used in the winders of coal field?and what are the various methods of it's speed control?

1 Answers   Monnet,

---

control wiring purpose,standards, ferrule code standard, interlock, schematic, symbol

1 Answers  

---

in dc suppy frequency is zero why? if dc frequency is zero how to exist dc transients and ac transients

0 Answers   Siemens,

---

Please tell me the earthing procedures adopted for the STAR-STAR 3 Phase transformer in india and give a better sugession for earthing

0 Answers  

---

how to calculate restraing current and operating current for differential protection if 20 mva transformer is OLTC 33 kv/11 kv ? and what should be the type and ratio of CT?

2 Answers   L&T, OPS,

---

Between Star-Delta & Star-Star Power transformer which one is efficent for Earth Fault?

10 Answers  

---

what will happen if we double the input frequency of a transformer keeping the voltage constant?

6 Answers  

---

where lt & ht capacitor used

0 Answers  

---

In a Circuit how the MCB and Fuse ratings are calculated. And shall the fuse follws the MCB or it is otherwise?

16 Answers   Emerson, HCL, Thirumalai Chemicals,

---

what is the differn bitween RCCB &MCB

3 Answers  

---

If load current is 70amps or 50amps what range of CT to install for ampere metering

3 Answers  

---

what is the advantage of NiCd battery over Lead acid battery?

2 Answers   BARC,

---