saravanan


{ City } erode
< Country > india
* Profession * lect
User No # 17872
Total Questions Posted # 1
Total Answers Posted # 12

Total Answers Posted for My Questions # 0
Total Views for My Questions # 1465

Users Marked my Answers as Correct # 103
Users Marked my Answers as Wrong # 71
Questions / { saravanan }
Questions Answers Category Views Company eMail

what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?

 Electrical Engineering 1465



Answers / { saravanan }

Question { TATA, 8444 }

If carbon brushes spring tension either loose or tight,
what happen on Motor performance During Full load Operation?


Answer

there may be a possibility of sparking b/w slip ring and
brushes that will damage both.

Is This Answer Correct ?    13 Yes 0 No

Question { 9475 }

I want Primary side delta and Sec side Star connection
transformer . but i have received Star - Star
transformer ,shall i use the same transformer by giving the
only 3 ph on Primary side without Neutral connection on the
Starpoint.


Answer

we can use the tr. in delta/star by disconnecting the
primary side winding teminals of each phase and reconnect
in delta in the primary side.

Is This Answer Correct ?    3 Yes 7 No


Question { 6420 }

Upto what extent, the lagging power factor can be improved
with the help of capacitors?


Answer

using thyristor switched capacitor(TSC) the pf can be
improved to near unity

Is This Answer Correct ?    2 Yes 2 No

Question { Bhel, 11710 }

On what factors the generating voltage depends ?
Generating voltage are (3.3kV, 6.6KV , 11KV, 13.8kV) Why so ?


Answer

generating votage depends on speed of rotation of prime
mover magnetic field strength and no. of turns in the coil.
in Transformers E = 4.44 * flux * freq * no. of turns in
the winding

Is This Answer Correct ?    14 Yes 4 No

Question { ABB, 11223 }

if we convert Ampers into kva,which one formula use by
us,pls tell me?


Answer

KVA = KV * A

Is This Answer Correct ?    11 Yes 7 No

Question { ABB, 9395 }

if we convert kva into Ampers,which one formula use by
us,pls tell me?


Answer

I =KVA/KV

Is This Answer Correct ?    13 Yes 17 No

Question { TCS, 21354 }

AC current is flowing in a wire in your home how can you
measure it(name of the instrument)


Answer

clamp on ammeter

Is This Answer Correct ?    16 Yes 2 No

Question { ONGC, 19084 }

what is the suitable voltage of transmission line to
transmit 10000w power through 250 km.
(a)11kv
(b)33kv
(c)66kv
(d)132kv
]and please tell me whats the logic behind it


Answer

Line losses are minimum in higher voltage level so we
choose 11 Kv for transmitting 10 Kw power.

Is This Answer Correct ?    3 Yes 16 No

Question { Radiant, 16044 }


in three pin pluge there three pins one is phase and second
is earth third is nutral why nutral high diameter compare
with phase and earth


Answer

Normally earth pin is larger in dia than phase and neutral,
to provide low resistance path for the flow of fault
current. We know resistance = (resistivity * length)/ c.s
area of the conductor

Is This Answer Correct ?    7 Yes 3 No

Question { GE, 3924 }

what are frequency changers ? Tell me about commertially
availble frequency changers ?


Answer

Frequency changer can step up or step down the frequency.
power converter(cycloconverter) converts (step-up or step-
down) the input supply frequency to the desired frequency
with or without voltage control. Cycloconverters are used
to power the high frequency induction furnaces in steel
industry

Is This Answer Correct ?    8 Yes 0 No

Question { ReasonSoft, 13272 }

How to calculate the load loss and no load losses of the
power Transformer?
i am having the following details :
full load ct : in AMP HV :1676 ; LV:31.5 1800 KVA ;33KV/620
V for wind mill applications


Answer

by conducting open circuit test by exciting LV winding with
rated voltage keeping HV winding open and Short circuit
test by shorting LV winding and exciting the HV winding
with reduced voltage, so that the tr. will draw a rated
current. we get no load loss. then we can predetermine the
load loss for any load or load loss is determined by
conducting back-to-back test on two identical trs.

Is This Answer Correct ?    12 Yes 9 No

Question { 7039 }

To check the earth condition (In plug points); the voltage
between earth and Neutral is in below 5 volts. Is it
correct


Answer

zero volt.

Is This Answer Correct ?    1 Yes 4 No