How the train speed control?

1 Answers   Bhel,

---

7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

0 Answers  

---

compressor compresses air means exactly what happens?

2 Answers  

---

what is mean by descripiency relay? & wht is its ansi code?

0 Answers  

---

why contactor not provided between output of VFD and motor?

6 Answers   Siemens,

---

---

What is the function of NGR for the parallel operation of alternator? whats happen when different rating of alternator are running with parallel?

0 Answers   Welspun,

---

what is the full form of XLPE adn there use.

4 Answers   Voltas,

---

what is the relation between the leading pf and supply voltage?

1 Answers  

---

Why the rating of dc machine is in HP??/ Do reply guys..Its very important......

4 Answers   Apollo,

---

why when i start my diesel generator it takes 1 minute or less then stop, and i checked the oil sensor is ok and when the generator start i can get 220 voltage but it it is stop after 1 minute or less, how can i solve this problem?

1 Answers  

---

Explain the role of a car driver as one of a feedback mechanism.

0 Answers   GE,

---

Why we say three phase voltage 440v.

2 Answers   VDP,

---