kumar


{ City } madurai
< Country > india
* Profession * engineer
User No # 32579
Total Questions Posted # 127
Total Answers Posted # 63

Total Answers Posted for My Questions # 460
Total Views for My Questions # 895191

Users Marked my Answers as Correct # 554
Users Marked my Answers as Wrong # 250



Questions / { kumar }
Questions Answers Category Views Company eMail

how we can save the power ? suppose the electricity board gives 11 kw , but the machine require only 8 kw means how we can save the exese energy

2 Electrical Engineering 2656

what is meant by frequency ?

TCS,

10 Electrical Engineering 21995

Suppose the incoming power is 11 kw, but the load require only 8 kw means how can we save or use the excess power?

3 Electrical Engineering 3142

In 90 kva alternator that produce the output voltage is 115(p-n),200(p-p) at 1500 rpms means what ampere it produced ?

Electrical Engineering 906

What is the difference between INVERTER and UPS?

7 Electrical Engineering 9883

how we protect the motor & what are the components required for that ?

2 Electrical Engineering 2828

what is meant by magnetic flow meter ? explain its working principle ?

1 Electrical Engineering 2965

what is meant by motor protection relay & its working principle ?k

Pricol,

1 Electrical Engineering 2634

what is meant by power factor ?

Pricol, Harita,

17 Electrical Engineering 10849

what is the difference between KVAR & KVA ?

Hyundai, Pricol, Bombay Rayon Fashions,

11 Electrical Engineering 22823

why the motor running in delta connection ? it can be in star?

NTPC,

13 Electrical Engineering 45866

what is the use of power factor ? where its applicable ?

4 Electrical Engineering 10090

either water sensor or flow meter,how we observe the water level, f any other equipment are in market ?

Electrical Engineering 817

what are the electrical components required for run the motor pump including safety components plz explain it how we can use such components .

2 Electrical Engineering 2485

which type of motor is suitable for water suction pump ?

4 Electrical Engineering 3445







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Answers / { kumar }

Question { ABC, 151215 }

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 .

Is This Answer Correct ?    73 Yes 9 No

Question { Accenture, 27341 }

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 )

Is This Answer Correct ?    16 Yes 8 No





Question { 2838 }

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 .

Is This Answer Correct ?    1 Yes 1 No

Question { HP, 21420 }

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.

Is This Answer Correct ?    6 Yes 2 No

Question { 7865 }

Define current?


Answer

flow of electrons in a conducting material

Is This Answer Correct ?    2 Yes 2 No

Question { JCB, 25295 }

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

Is This Answer Correct ?    4 Yes 4 No

Question { 9108 }

what is range ACB


Answer

AIR CIRCUIT BREAKER RANGE IS ABOVE 1000 A

Is This Answer Correct ?    3 Yes 7 No

Question { 2883 }

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 .

Is This Answer Correct ?    1 Yes 2 No

Question { 18897 }

What are the functions of different Parts of Alternator?


Answer

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

Is This Answer Correct ?    20 Yes 15 No

Question { Suzlon, 18823 }

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

Is This Answer Correct ?    19 Yes 19 No

Question { IOCL, 5318 }

what is the problem occer in motor


Answer

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

Is This Answer Correct ?    14 Yes 0 No

Question { Bhel, 5993 }

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

Is This Answer Correct ?    1 Yes 5 No

Question { 5241 }

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

Is This Answer Correct ?    8 Yes 2 No

Question { 3295 }

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.

Is This Answer Correct ?    5 Yes 0 No

Question { Navrachana University, 86229 }

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)

Is This Answer Correct ?    47 Yes 8 No

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