ankush


{ City } faridabad
< Country > india
* Profession * engg.
User No # 23728
Total Questions Posted # 16
Total Answers Posted # 79

Total Answers Posted for My Questions # 95
Total Views for My Questions # 259859

Users Marked my Answers as Correct # 2006
Users Marked my Answers as Wrong # 953
Answers / { ankush }

Question { Genpact, 23605 }

why earthing is not required on transformer prymary winding
side ???


Answer

the neutral is generated at the secondary side of the t/f,
so the earthing is done at sec. called the dedicated
earthing. but at the pr. side of the t/f no neutral is
generated hence require no earthing. but the body of t/f
is also earthed.

Is This Answer Correct ?    18 Yes 2 No

Question { 7961 }

want to know about DMRC


Answer

delhi metro rail corporation

Is This Answer Correct ?    18 Yes 1 No


Question { Chemplast, 215367 }

How can get electrical "c" licence.I am complited in
Deee.Passing year of 1993.Working in pvt cocern lt
Line.Please advise me .Cell no 9994786021


Answer

collect the form from karmpura delhi. fill the form ,
interview will be done at table on sport

Is This Answer Correct ?    63 Yes 68 No

Question { 18325 }

What is the function of the serge absorber?


Answer

first of all correct ur speling its SURGE NOT SERGE OK
surge arrestor comprises of the resistors which nullify the
effects of surges produced internaly

Is This Answer Correct ?    9 Yes 4 No

Question { DLF, 17860 }

Why use the VCB at High Transmission System ? Why can't use
ACB? Pls explain the ans.


Answer

at high voltages the air may get ionized but the vaccum
doesnt. so dats why..........

Is This Answer Correct ?    10 Yes 4 No

Question { HCL, 8809 }

what we happen if 400 kvar cpacitor banks are on in manual
mode and there is no load on mains ??????????????


Answer

if all this happen the power factor increases from unity
and the supply is fed back to the system i.e. the load
becomes the source.
or


when capacitors charge to its peak value they will not get
any path to discharge and remains charged i.e. nothing will
happen.



or




practicaly try karne ka yaar.........

Is This Answer Correct ?    2 Yes 3 No

Question { CDS, 50196 }

how to calculate cable size by amp


Answer

for
a. cu cable: 1 sqmm=5amp
b. al cable: 1sqmm=1.5amp

Is This Answer Correct ?    119 Yes 42 No

Question { TCS, 86207 }

what is electric traction?


Answer

traction means using the electric power for traction system
i.e. for railways, trams, trolleys, etc.
electric traction means use of the electricity for all
these . now a days magnetic traction is also used for
bullet trains.
basically dc motors r used for electric traction systems

Is This Answer Correct ?    176 Yes 29 No

Question { BSNL, 5829 }

roles of owslaw explain?


Answer

i think it is ohm's law.

Is This Answer Correct ?    2 Yes 1 No

Question { 16883 }

how to calculate capacitor bank value to maintain unity
power factor plz xplain with some suitable xample?


Answer

KVAR= KW(TAN(COS(-1)#e)- TAN(COS(-1)#d) )

#e= EXISTING P.F.
#d= DESIRED P.F.

Is This Answer Correct ?    35 Yes 3 No

Question { 4400 }

How ships are protected from lightning?


Answer

A DEVICE CALLED MAST IS USED FOR THAT.
IT IS LOCATED AT THE TOP OF THE SHIP.
THIS MAST IS CONNECTED TO A GROUND PLATE AT THE BOTTOM OF
THE SHIP.
THIS GROUND PLATE THEN PASSES THE CURRENT TO THE SEA WATER
WHICH THEN TO D SEA EARTH AS SEA WATER IS A VERY GOOD
CONDUCTOR.
THE MAST ALSO PROVIDES SOME ANGLE TO THE LIGHTNING WAVE
WHICH DIVERTS THE WAVE DIRECTLY TO SEA WATER.

Is This Answer Correct ?    17 Yes 2 No

Question { Philips, 12879 }

enlist types of dc generator


Answer

1. dc series gen.
2. " shunt "
3. " compound "
a. long shunt
b. short shunt

Is This Answer Correct ?    21 Yes 6 No

Question { BSES, 5895 }

What_is_mean_by_negative_dc_voltage? why we use -48v except
+48v in DC power supply systems.


Answer

IF WE CONNECT THE +VE POLARITY TO THE EARTH AND -VE TO THE
EQUIPMENT THE VOLTGE IS CALLED -VE DC VOLTAGE.
THE POSITIVE POLARITY ACQUIERS THE CORROSION VERY QUICKLY
AND TO MAINTAIN THE VOTAGE OF THE DEVICE UNDER
SPECIFICATIONS IT IS DONE.

Is This Answer Correct ?    10 Yes 1 No

Question { Suzlon, 65467 }

what do you mean by leading power factor & lagging power
factor


Answer

P.F.=COS#= TRUE POWER\APPARENT POWER
FOR INDUCTIVE LOAD INDUCTOR IS USED WHICH OPPOSES THE
CHANGE IN CURRENT IN THE CIRCUIT AND STORES THE ENERGY IN
THE FORM OF CURRENT AND LEAVES IT LATER. HENCE THE CURRENT
CURRENT WAVEFORM LAGS THE VOLTAGE WAVEFORM, AND THE POWER
FACTOR IS CALLED LAGGING./
FOR CAPACITIVE LOAD CAPACITOR IS USED WHICH OPPOSES THE
CHANGE IN VOLTAGE AND STORES THE ENERGY IN THE FORM OF
VOLTAGE AND LEAVES IT LATER. HENCE THE VOLTAGE WAVEFORM
LAGS THE CURRENT WAVEFORM, AND THE POWER FACTOR IS CALLED
LAGGING BUT THE CURRENT LEADS THE VOLTAGE AND HENCE THE
P.F. IS CALLED LEADING P.F.

Is This Answer Correct ?    45 Yes 10 No

Question { 35212 }

what is the significance of tan delta testing?explain the
theory?


Answer

Tan Delta is an effective tool in determining the
insulation condition of power cables using a VLF-TD System
Tan Delta measures the resistive component of a cable
system; a perfect cable is all capacitance and has no
resistance. The resistive component is caused by voids in
the insulation, electrical trees, water trees etc. The
resistive element causes the voltage not to lead the
current by 90° (something less) This is difference in angle
(less than 1° ) is the loss angle. The tangent of this loss
angle is the Tan Delta / or the tangent of the loss angle.

Is This Answer Correct ?    30 Yes 12 No

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