Question { 4274 }

how can we rotate a single phase motor (without cap.)in
reverse direction?

Answer

we kannot strt a 1phase motr with out kapacitr, since the
1phase motrs are not self strtng.

but without kapacitr , we kan rotate 1phase motr in either
direkt, by giving some xternal torque to the motr shaft at
at the tym of strtng.

Question { ONGC, 4004 }

how to decrese the PH value of liquid resistance?

Answer

add some caustic soda to the solution, and make sure the ph
value shud lie btwn 9-12..for a gud liquid resistor

Question { HPL, 4340 }

what is humming noise and wha is the reason to develop
humming noise in a mv pannel ?

Answer

the humming noise is due to the MAGNETOSTRICTION phenomenon.
the magnetostriction is caused due to the quik magnetic
reversals in ac circuit. magnentostriction is developed from
the words 'magnetic' 'restriction' implies the opposition of
the reversals of the magnetizing current.or simply..
oppozing the magnetizing and demagnetizing processes..
due to this some energy is lost in heat and some enrgy is
lost inthe form of sound but notice that sound was aktualy
produced by the minute vibration of the core and some other
metal parts. but we cant see this vibration wth our naked eye.

generally megentostriction does not okkurs in dc ckts.

Question { 18408 }

What is different between Regulator & Stabilizer?

Answer

Regulator: it is a device which controls a parameter in some
pre determined steps or simply, regulator allows some
elektrikal quantity,,ina stepped manner vch facilitates to
increase or decreases the magnitude of the parameter.
but, tthe imp.thing to notice is a regulator kan wrk as both
regulator and stabilyzer.
i.e.,the regulator kan also kontrol the parameter to a set
point,implies, if there is any fluktuation inthe magnitude
of the given parameter,the regulatr tends to bring the error
to minimum..by decreasing the dfrnc btwn setpoint and aktual
value.
THIS PROCESS KAN BE DONE IN MANY DFRNT KONTROLLABE STEPS(AT
DFRNT MAGNITUDES)

stabilizer: the stabilizer kontrols the given parameter,and
it reduces the dfrnc btwn the setpoint and aktula value of
the parameter

Question { 3873 }

on whcih cycle does gas turbine works?

Answer

RANKINE CYCLE

Question { Equate, 5955 }

Which type starter is used for synchronous motor?

Answer

gnraly,, induktn mtr r used,,(small syz)
vch r known as penny motors

Question { 5150 }

how we can check the CT & VT?

Answer

the question was incoorect or inkomplete.
ok
if wanna know vch is ct nvch is vt..
bye obserrving the windings of the t/f s we can conclude
vch is ct and vch is vt.

ct has only 1 turn in the priamry side, (vch was thik and
generally flat) and the secondary has number of turns..

where as vt has many number of tunrs on the primary side and
secindary has comparatuvely less numbr of turns.

note: like the general t/f s the cts and vts shud not b used
in any manner.i.e the primary and secondary shud not be the
any 1 winding of the tf. but striktly, primary shud priamary
alwwaayss..

Question { 15204 }

why corona loss is less with negative polarity?

Answer

corona loss is obviously less when compared to the poztv
polarity or (phase)
to understand this we have to know the corona phenomenon,
the air surrounding the HT OR HV conductor gets ionized due
the high potential (nd skin effect also) and this ionised
air also acts as conducting medium, hence the losses okkurs
there. but koming to the negative polarity, the voltage is
very less hence the ionisation of the air surrounding is
very less (comparatively),, henc the corona loss is minimum
with ngtv polarity.

any queries regarding this plz kontakt srikrishna_2020@yahoo.com

Question { 15204 }

why corona loss is less with negative polarity?

Answer

corona loss is obviously less when compared to the poztv
polarity or (phase)
to understand this we have to know the corona phenomenon,
the air surrounding the HT OR HV conductor gets ionized due
the high potential (nd skin effect also) and this ionised
air also acts as conducting medium, hence the losses okkurs
there. but koming to the negative polarity, the voltage is
very less hence the ionisation of the air surrounding is
very less (comparatively),, henc the corona loss is minimum
with ngtv polarity.

any queries regarding this plz kontakt srikrishna_2020@yahoo.com

Question { Tanfac, 4626 }

what is difference betwen genrator and alternator?

Answer

generator is a kommon term which denotes a device which
produces power either it may be AC or DC,

but alternator is device (generally large generators, which
has stationary armatur but rotating field) which produces AC
power only.

Question { Bhel, 9418 }

why there is a humming noise in transformer

Answer

the ansr given by mr.nilkanth is only the right ansr.
gud wrk pal.

Question { IOCL, 53809 }

which motor is used in electric train...???????

Answer

kongrates 2 all.. hu said dc series motor.

since the starting torque is very high, obviously this motor
is widely used for traction purposes..

the ratings of komn dc series mtr used for traction is,,

750v dc
650A
the gear ratio is 63:17
each locomotive (train engine)consists 6 such motors.
for more details on this topik kontakt me on mail id

Question { 6376 }

what is power factor

Answer

aktually power factor is the ratio of apparant power and
aktual power flow in the cirkuit.

i.e. cos # = kva/kw

in kommon wrds.. power factor is the amount of power
konsumed in the unit power supplied.
always power factor should be high.
as high as the power factor, the efficiency vl b high


for any douts or diskussions kontakt me on
srikrishna_2020@yahoo.com
or vizit http://myelektricity.blogspot.com/