Answer Posted / vanraj

For surge arrester (lighting arrester) class defines the
capacity of energy can dissipate by SA.

Class in generally not defined by B & C but it defined a
class 2 , Class 3 , Class 4 & class 5 for sub stations.

For 145 kv (110,132 kv ) class 2
For 400 kv ( 400 kv) class 3
For 540 kv (generally not use in india) class 4
For 765 kv Class 5

what is the working principle of a DG Set, Alternator, & exiter

9733

---

We are planning to synchronized DG's with our captive plant in the event of black start of plant, but before sync we checked voltage of DG with our plant voltage and it varies from 5 V to 450 V. So in this condition how we can sync DG with plant ?

1084

---

A Question Like A Wire Is Wound Whose Resistance Is Some 132. 44647 Ohms. If A Voltage Of 30 mv, 296 Ma Current Is Applied To It What Is The Resistance.

613

---

What is steady state response?

662

---

What are the types of power in electrical power?

712

---

---

In a large office how do we calculate required number of light fittings, assuming fittings are 4x18W or 2x36W fluorescent fitting ?

1408

---

what are the types of electromagnetic forces developed in practical transformer?

2154

---

why we not used 11kva as a direct our electrnics component.

2331

---

What is the effect of positive feedback on stability of the system?

623

---

What is T’Q and X’Q and X’D ? and what is saturated as well as unsaturated ?

1276

---

There is air in a room . the top and bottom of the room are at constant temp. T1 and T2. DRAW THE temp profiles if a. T1 greater than T2 b. T1 less than T2

1417

---

what kind of technical test that i need to learn because i have an interview tomorrow.. please someone help me..

1483

---

How to arrange a hous hold earthing system to keep minimum earth resistance( below 7ohms).

1479

---

My load is 1635 KW. & current pf is 0.884, I have to improve it for 0.99.Please suggest what KVAR value is needed?

1178

---

What is the necessary condition for stability.

719

---