Answer / k.prakashchandra

Classification based on max allowable working temp 1. A
-1o5'C -oil ,bitumen 2.B -130'C-polyester film, mica 3.C
-above 180'-quartz, porcelain 4.E-120'-glass cloth,resin
5.F-155'-mica, glass, asbestos 6,H-180'-silicone rubber,
composite mica 7.Y-90'-wood,cotton

why is a power transformer used only occasionally?it is used to step up at generating stations?and that needs to be done all day long !!!!!!!

0 Answers  

---

what is ISF

1 Answers  

---

How to check the specific gravity of the two 12 V batteries connected in series to a 24 V UPS and inverter ? will we have to disconnect all the connections and turn off the UPS and inverter or not ? will we have to check specific gravities in each cell of the two batteries ? what is the name of the instrument that is used to check the specific gravity and whats the procedure to check the specific gravity with it ? thanks

2 Answers  

---

1) Explain why we don't link the two earthing system ht and mv on a pole mounted transformer sub-station.

0 Answers  

---

What is the speed of electrical supply?

3 Answers  

---

---

what is power factor

5 Answers   Exide,

---

Pl. brief about break-down maintenance of machine tool.

0 Answers  

---

how to improve power factor correction?

3 Answers  

---

How to increase the backup of three phase ups?

1 Answers  

---

What is the Full form of Rccb,MCCB,

11 Answers   Marriott, Maruti Suzuki, MCB, PCC, RCCB, Torrent Pharma,

---

what is timing for mccb 800A tripping?

1 Answers   L&T,

---

1)Why potential transformer primary site grounded? 2)can be loop between neutral & body for grounding? 3)What is the difference between ELCB &RCCB? 4)Why we use iron core in transformer insted of wooden core? 5)what is the principle of excitation? 6)Why we test the core balance test for transformer? 7)what is creepage?What is the creepage length for insulators at different voltages? 8)How much type of relays used for differential protection of generator,transformer & busbar protection?

5 Answers  

---