Answer / ss

there is chances of failure of ac suply but dc suply cant
fail because it is fed from batery bank.

Answer / maddoxx

in control and protection ckt very small current is require in relays ,cb etc .The panel is placed far from the work place.so if we use small ac current there may be chance of interference by communiation frquency and signaling it also produces noise which can too interfere in other sognalling freq. so dc current there is no frequency and we can increase the accuracy and sustain the strenth of signal coming to controlling panel.

Answer / vijay balu raskar

DC is constant & continuous source. For protection & control it is suitable. Also, having quick responce without disturbance & variation. In ac opposite of dc.

Answer / tahirwasim10

Protection of a system is very necessary factor which
require fast response during faults. For protection of a
power system the D.C used instead of A.C because there are
many problems in A.C ( quantities variation problems, slow
response problems etc).

Define transfer function?

0 Answers  

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which type of winding is used for high voltage & low current?

1 Answers   GEB,

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what is electricity

4 Answers  

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Is it possible to measure the voltage of a battery from a single terminal?

0 Answers  

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which is batter in construction job,ELCB or RCCB?

7 Answers   HCC,

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What is a Servo Stabliser.

2 Answers  

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why we use MV panels??? what's r all the needs

4 Answers  

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in case of induction motor when overload condition or any short ckt. why stator winding burn not to be rotor winding

2 Answers  

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why a vaccum is created in condenser

13 Answers   Honda,

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Please clarify, 1. Is it required to lay two runs of GI wire along with Armoured LT cable if it is laid between one big mains (63Amps TPN SDF) to small main (32A TPN SDF) with proper glanding termination? 2. If the armoured cable with proper glanding is laid from DB to CNC machine, is it required to run two runs of body earthing to the Machine from DB? 3.If the armoured cable with proper glanding is laid from Substation to Hangar, distance is approx. 100 mtrs, is it required to do earthing at shop area though the primary termination at substation is earthed through gland.

0 Answers   HAL,

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What is notching in dc machine?

0 Answers  

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Sir, I have applied for the of Jr.engineer(Electrical & Electronics) & ASST. LOCO PILOT at ALL RRB BOARDS. please send me all RRB Boards solved papers in the year of 2001 tO till date. i requested send me the papers to my id as soon as possible (jet_0991@yahoo.com). (This is very urgent) Thank You,

0 Answers  

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