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baskaranpillay
{ City } petaling jaya
< Country > malaysia
* Profession * facility management
User No # 37765
Total Answers Posted # 81
Total Answers Posted for My Questions # 0
Total Views for My Questions # 0
Users Marked my Answers as Correct # 525
Users Marked my Answers as Wrong # 199
Question { 3898 }
what is the difference between ac drives and dc drives?
Answer
motor is DC operated than it is a dc drive like wise if the
motor is AC than it is a AC drive.For ac motors vfds are
commonly used for speed control.
| Is This Answer Correct ? | 1 Yes | 0 No |
If you know per phase current and phase to phase voltage;
what is overall KW of the circuit?
Answer
current consumed and the power factor.Without knowing the pf
you can only guess the pf by the type of load but than the
KW reading wont be correct.
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { 5783 }
WHEN WE TOUCH THE BOTH TERMINALS OF BATTERY WHY NOT THE D.C
BATTERY GIVE US SHOCK SUCH AS A.C SUPPLY?
Answer
current depends on the potential difference and the
resistance posed by US when touched.
try touching both terminal ends of a battery of higher
voltage rating say 75volts and above.
| Is This Answer Correct ? | 1 Yes | 1 No |
Question { 5783 }
WHEN WE TOUCH THE BOTH TERMINALS OF BATTERY WHY NOT THE D.C
BATTERY GIVE US SHOCK SUCH AS A.C SUPPLY?
Answer
current depends on the potential difference and the
resistance posed by US when touched.
try touching both terminal ends of a battery of higher
voltage rating say 75volts and above.
| Is This Answer Correct ? | 1 Yes | 1 No |
Question { 3931 }
What is the difference between harmored cabled and
unharmored cables
Answer
armoured cable is cable with some kind of protection like
steel wire, copper tape, lead covered, pvc, xlpe, or steel
conduit or some other type.In unarmoured cables it is
unprotected cables other than electrical insulation.Than the
user decides to provide the necessary mechanical protection
as necessary.
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 6266 }
What happen if 200KVAR capacitor continuesly connected to
load and all the plant machinaries are not in working?
Answer
a tendency to increase the voltage slightly.Other wise no
harm happens except you are helping the power suppliers
maintain the PF in their system at your cost.
| Is This Answer Correct ? | 6 Yes | 0 No |
Question { 5454 }
I try to check the three phase voltage in multimeter, in
125A isolator switch incommer. first i touch R phase, and
then i touch Y phase using multimeter, the moment i touched,
it blasts and that moment i got blindness. multimeter
selector position is correct(750V AC MODE AND RED PROBE WASS
IN v AND BLACK PROBE WASS IN COM. MODE. COULD ANYBODY GIVE
ANSWER FOR THIS TO AVOID FURTHER ACCIDENTS PLEASE?
Answer
multimeter should have given you the voltage reading ,but
than some multimeter comes with a separate probe socket for
testing of amperes. maybe maybe, the probe was wrongly
plugged into this socket.
| Is This Answer Correct ? | 2 Yes | 0 No |
Question { 4916 }
Hi ,what the accurate method to set correct(In) over load to
protect the 3~ motor
Answer
current setting I carry out an actual current consumption
test with a clamp ammeter.If the reading is lower than the
rated full load current of the motor I would set it at
actual reading add 5 percent and set it as the tripping
current. But if the the actual consumption is already the
rated fl current or almost it than the setting would be at
the rated full load current of the motor but never exceed
it.This way if it trips at any time than find out the root
cause and than only put into operation.
| Is This Answer Correct ? | 4 Yes | 1 No |
Question { 6809 }
what is advantage of using star to delta in place of dol
starter
Answer
reduced starting current.It can be beneficial mechanicaly
also for example the dol stared belt driven fan will have
more belt wear and tears compared with star delta connected
starters.
| Is This Answer Correct ? | 1 Yes | 0 No |
Question { 4524 }
my question is that....few days ago i had installed a three
phase motor starter for an electric saw.the motor will run
and make the hydraulic pressure which will be goes to
pressure cylender by up and down lever.two number of
limitswitches are also installed on cylinder for safety of
motor.now when the arm of cylinder reaches to the upper or
lower limit it will cut the motor's line.and motor will be
stop.now wana know that what will i do that motor runs
continue after the limitswitch cut it down but it shold not
be made any pressure.pls answer me in brief.
Answer
set at the correct pressure in your hyd system where the pump
can perform its task but when the piston reaches the top the
pressure build up will be too high and the excess pressure is
released through the valve, the limit switches wont be
necessary any more.the pump will be running all the time.
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 22601 }
How to Calculate 11 KV Side Cable size of a 250 KVA Oil
cooled transformer
Answer
know the operating current first before determining the
cable size. if 250 kva than 250000 / 11000 / 1,732 = 13.12
amps the cable should be able to withstand 11000 volts and
carry 13.12 amps.
| Is This Answer Correct ? | 14 Yes | 9 No |
Question { 3460 }
how can we find of cable capicity in amper?how much ampere
withstand by 300sqmm cable?
Answer
manufacturers. The same cable under a different condition
will have a different capacity.Cable tables are usually
given away free by the cable manufacturers.
| Is This Answer Correct ? | 4 Yes | 0 No |
Question { 3709 }
Why pmg used in electrical generators for excitation.is there any other method without pmg ?
Answer
can be produced from electro magnetic means . What if during
a power failure when the DG set usage is most wanted and the
electrical source from a battery is also not available say
due to battery failure or discharged battery.To avoid such
situation a permanent magnet is used instead for initial
excitation.
| Is This Answer Correct ? | 2 Yes | 0 No |
Question { 7939 }
in an ac series circuit there are 30 bulbs are connected in
a serial set.what will happen if one bulb is fused and we
removed the bulb and reconnect with the remaining bulbs? (29
bulbs). will the brightness of other bulbs increase or not?
Answer
then the Resistance reduces and would result in more current
flow. This would result with a brighter light.
| Is This Answer Correct ? | 7 Yes | 2 No |
Question { 3980 }
what is dol starter
Answer
supply is directly applied across the motor terminals
whenever it is used unlike some bigger motors where the
power supply goes through a starting system to enable a
smoother start or a reduced current start.Some examples are
star delta ,auto transformer starter ,rotor resistance
starter, soft starter etc.
| Is This Answer Correct ? | 1 Yes | 0 No |
