k.prakashchandra


{ City } karkala
< Country > india
* Profession * rtd e.e.
User No # 54717
Total Questions Posted # 0
Total Answers Posted # 521

Total Answers Posted for My Questions # 0
Total Views for My Questions # 0

Users Marked my Answers as Correct # 1313
Users Marked my Answers as Wrong # 525
Answers / { k.prakashchandra }

Question { 3364 }

Why Auto Transformer is called "Auto"? What is the logic?


Answer

Auto means self . As the single winding acts as a transformer without requiring a secondary winding ,it is called so

Is This Answer Correct ?    1 Yes 0 No

Question { 9829 }

what is the Space heater? why using in Electrical motor?


Answer

It is used to warm up inside of panel or motor .In case of
motor,now instead of flat space heater ,current is passed
through winding using a transformer

Is This Answer Correct ?    0 Yes 2 No


Question { 2357 }

In a company the lines carrying 33KV but the load is below
10000Volts so we know that <11KV we can put 11KV lines but
the lines are 33KV,..so how we can step down the voltage to
11KV with out erecting a substation


Answer

You can request the distribution company for change for supply system

Is This Answer Correct ?    0 Yes 0 No

Question { 3654 }

It is advisable 2 use auto-transformer if transformation
ratio is-a)110KV/11KV,b)230kv/110kv,c)110kv/66kv,d)
400kv/230kv


Answer

Yes,except a)

Is This Answer Correct ?    0 Yes 0 No

Question { Intel, 5815 }

What is the diffrence between ofline ups and online ups?


Answer

In case of on-line UPS ,the load is always met by inverter
,and for off-line , it is either line directly or inverter

Is This Answer Correct ?    3 Yes 0 No

Question { ITC Infotech, 3097 }

In power plant synchronizing time (synchroniging meter
should be 12'o clock position only. why not 6'o clock
position not possible.


Answer

That is its normal position i.e. zero voltage position

Is This Answer Correct ?    1 Yes 0 No

Question { Wipro, 4348 }

how synchronous generator can be used as synchronous condenser?


Answer

Close the turbine / prime mover , while running in parallel
with other generators/ grid . Vary the excitation to get the
required leading KVAr

Is This Answer Correct ?    0 Yes 0 No

Question { 15469 }

what's the use of
cvt and wave trap
in 400kv switch
yard.......


Answer

P L C C, line 'Live' indication ,synchronization

Is This Answer Correct ?    0 Yes 1 No

Question { Siemens, 9141 }

what happens when we apply dc to a transformer


Answer

As there is no back e.m.f ( opposing voltage ) the magnitude of current depends on dc resistance ( R ) of the windings and voltage

Is This Answer Correct ?    0 Yes 0 No

Question { 4450 }

11Kv Dog conductor 6/0.186 formula Line Losses ?
Length 4.85Km
amper ..?
52 Pole
Max Load 3200Kw


Answer

Resistance of dog conductor is 0.28 ohm /KM at 20'C.Find the current and use the formula W = I^2 R

Is This Answer Correct ?    0 Yes 0 No

Question { 2179 }

we have 3*1 MW generator one NGR is common for all it will
be selected during paralle our problem is two generator ca
be paralled but when slecting third one we need to close
NGR selection on third one other wise voltage not matching
why?


Answer

To establish relationship between I/C generator and the grid / bus bar/ other two gen through earth

Is This Answer Correct ?    0 Yes 0 No

Question { L&T, 32501 }

Earth Is a very good conductor or very good insulator.? If
a good conductor then why current donot flow through small
piece f earth and if a good insulator then why we use it as
return path in lines.???


Answer

Earth is not a non-conductor nor a good conductor. It becomes good conductor due to its size . But the resistance between earth electrode and the earth can not be made zero easily and economically . In SWER system earth is used as return path

Is This Answer Correct ?    0 Yes 8 No

Question { 2573 }

purpose of flux
relay for turbo generator in power plant


Answer

Flux = K V/f . Over flux relay is for protection against over voltage and under frequency and you can have under flux relay also for under voltage and over frequency

Is This Answer Correct ?    0 Yes 0 No

Question { 20713 }

Why voltage regulation of an alternator is negative for a leading power factor?


Answer

The Gen voltage is less than the system voltage and gen
voltage rises to be equal instead of dropping due to the load

Is This Answer Correct ?    7 Yes 12 No

Question { 3704 }

Can u explain : how capacitor act when the supply is given
is a.c and d.c.
I know that when d.c supply is given then the capacitor
charges and becomes open circuited.
But please say about when a.c is given.
I have seen that when a.c supply is given ,it charges and
discharges,
But when we plug in capacitor to our daily supply and take
it out ,then we join those wires spark will appear,which
seems charge is present ,but when a.c is given it should
charge and discharge


Answer

The supply was removed when the capacitor was in charged
condition i.e. before complete discharge took place

Is This Answer Correct ?    2 Yes 2 No

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