Question { ABC, 177909 }

working of a diesel generator.

Answer

AS PER MY FIELD EXPERIENCE .IN DG SET DIESEL IS USED FOR
FUEL OF STROKE ENGINE,SO THE ENGINE PRODUCED MECHANICAL
ENERGY .THE SHAFT OF ENGINE IS COUPLING WITH GENERATOR
THEREFORE MECHANICAL ENERGY CONVERTED INTO ELECTRICAL
ENERGY .BY USING GOVERNOR WE CAN ADJUST THE SPEED OF THE
ENGINE .&WE CAN DEVELOPING OR CONTROLLING THE DG OUTPUT
VOLTAGE BY USING AVR(AUTOMATIC VOLTAGE REGULATOR).THE
CONTROLLING & DISPLAYING OF GEN SET IS OPERATING BY DC
VOLTAGE FROM BATTERY .WE CAN CHARGE THE BATTERY AT THE TIME
OF ENGINE RUNNING BY USING THE CHARGING ALTERNATOR.ITS
COUPLED WITH ENGINE SHAFT THROUGH BELT .FOR THE SAFE WE
USING STARTER MOTOR TO START ENGINE THATS MOTOR OPERATED BY
DC VOLTAGE .

Question { Accenture, 32209 }

How a synchronous generator practically work? what is the
function of avr(automatic voltage regulator)in synchronous
generator?how the connection of avr to the generator made
practically?please give me the answer.

Answer

AVR means automatic voltage regulator
AVR is heart of generator .initially generator produce
residual voltage only by prime mover that voltage it’s near
5 to 10% of rated voltage so we using AVR for buildup the
generator voltage. Its produce DC field voltage is also
called excitation voltage. That field voltage is fed to
excitor of generator and is converting into dc by RR
(rotating rectifier) RR output fed to main rotor depend
upon the field voltage generator produce voltage & that
output voltage we should fed as reference voltage to AVR
through transformer then depending upon the reference AVR
buildup & maintaining the constant of generator output
voltage . AVR require dc supply for operation so we require
battery or some DC source. In some standard generator they
provide AVR also otherwise we can design as per generator
excitation voltage but if you take any AVR mainly its
require dc input, generator output reference & AC auxiliary
supply.any more answer ????????

BY
kumar (AVR panel service engg )

Question { 5565 }

how the alternator transfere mechanical energy to
electrical one ??

Answer

for example take gen set in gen set alternator is coupled
with diesel engine .so whenever engine rotate .shaft of the
engine is coupled with alternator rotor .in alt stator has
permanent magnet so at time of rotor rotating its cut the
magnetic flux therefore Mechanical energy converted into
electrical energy .

Question { HP, 28417 }

if AVR fails in alternator. what will be the effect.

Answer

i have two year experience in this field i go with
VIKRAMSENAREDDY answer .ya his answer is perfect one.

Question { 17091 }

Define current?

Answer

flow of electrons in a conducting material

Question { Bhel, 47188 }

Questions :-
HR-
Q.1 about yourself & family background ?
Q.2 Why u choose Power sector as ur carrier starting not any
other sector ??
Q. 3 What think abt NTPC ?
Techincal Questions:-
Q.1 about Vocational Training……What u did , see the main
equipments….etc
Q.2 Why a transformer Noise during its running condition ?
Q.3 about transformer oil material & Test name for the
measurement of its dielectric strength & wht will u do if
its dielectric strength goes low ? ……..some discussion type ?
Q.4 What is relation between transmission lines &
Communication lines ?
Q.5 Which Machine u will prefer to use at a place where
flammable gases are coming out & why ?
Q.6 how fault in an electric system is detected & hw
protection of equipments is done ?
Q.7 Why we didn’t feel electric shock in an electric train ??
Q.8 Anything u want to ask from us ??

Answer

please send the answer to kumar4486@yahoo.co.in

Question { 16958 }

what is range ACB

Answer

AIR CIRCUIT BREAKER RANGE IS ABOVE 1000 A

Question { 4575 }

What are the different parts of Alternator and how it works?

Answer

it consist of exicitor stator & main stator, exicitor rotor
& main rotor RR( ROTATING RERIFIER)
its work as per the principle of faradays law .rotating
rectifier is converting AC into DC gives to field .

Question { 21375 }

What are the functions of different Parts of Alternator?

Answer

it consist of exicitor stator & main stator, exicitor rotor
& main rotor RR( ROTATING RERIFIER)

Question { Suzlon, 25777 }

why ht motor connection in star

Answer

because ht motor starting current always high so that
motor connection should be star to delta for limiting the
starting current.the principle is that staring position
motor connection in star later it change to delta

Question { IOCL, 8830 }

what is the problem occer in motor

Answer

generally in motor the over voltage,over current,over load &
winding damage problems will occur

Question { Bhel, 9915 }

what is field flash

Answer

I can't clear about this question but in alternator we
flash the field in RR(rotating rectifier)by give the Dc
voltage directly to field Its the method for developing AC
voltage

Question { 7717 }

1.wat is the purpose (or)function of regulator?

2.wat is the purpose of stabiliser?

Answer

In regulator we can get the vary output voltage ,
In stabiliser we can get only constant output voltage

Question { 6348 }

can you check the current and voltage of a 12 V battery by
a digital multimeter in this fashion that apply the digital
multimeter across the battery terminals directly ? say yes
or no ...
i sais yes ...........
is this true or false ?
plzz tell me and also explain ........ plzz thanks

Answer

ya surely can apply the digital multimeter directly .i
measured voltage of battery at the time of cranking the
engine in genset for check the battery is low or not in my
field by using RISH multimeter but i didn't measure current.

Question { Navrachana University, 95825 }

What is the working of AVR in AC generators?

Answer

As per my field experience AVR is automatic voltage
regulator which is provide for controlling or developing the
output voltage produced by ac generator .the input voltage
for AVR is drawn by field voltage is produced by RR
(rotating rectifier)