Answer Posted / karthik_elec

vcb: its produce the vacuum during the on off and fault
duriations. this vacum eliminate the arc between the
contact points.
sf6: its pass the sulfer hexa floride gas during the on off
and fault duriations, the pressure of the sf6 gas inside
the circuit breker is 5 to 7 kg/cm2. it will vary the
operating voltage of the sf6 CB

DEAR SIR,I GOT THE CALL LETTER FROM RRB, SECUNDERABD AS A JE-II SO PLEASE PROVIDE ME SOME MODEL QUESTION AND ANSWER PAPERS AND LAST YEAR QUESTION PAPERS

2056

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Could Please Explain briefly. Why used stabilizing resistance series with High impedance bus differential protection relay.

1790

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Why delta star trformers are used for lighting loads?

1184

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I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

1874

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what is the maximum permissible limit value of leakage current and leakage counter reading to replace lightining arrester?

5141

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why surge protectetor work explain with the help of circut diagram?

2011

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What is rotating magnetic field?Discuss elaborately.

2653

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What is different between resistance grounding system and resistance earthing system?

1156

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Incoming line 11kv And transformer capacity is 2500kva. Consumption load is 1300A. Then fuse capacity is 11kv line.

1678

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What is meant by system?

1074

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why transformer ratings in kva? & DG ratings in kva? & Motor ratings in kw/HP?

1516

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Why use in ht motore

1694

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Difference between drift current and diffusion current?

1883

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WHAT IS THE FAULT WHEN 100HP TURBINE MOTOR TRIPS, LIST THE FAULTS AND ITS TRABULESHOOTING TIPS.. MY AUTO TARNSFORMER STARTER TRIPS

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What range of speed can you get with the armature control method of speed control of d.c. Shunt motor?

1135

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