ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electrical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3114)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3298)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13420)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2382)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (420)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (165)
 Instrumentation interview questions  Instrumentation Interview Questions (2393)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (107)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (45)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (78)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1202)
Question
What is the effect of leading power factor for power 
transformer & D.G?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
The stability of a generator depends on the field strength
of the magnetic field establishing in the air gap by the
rotor ampere turn. if the field is weakened the stability
margin is reduced.
Leading power factor causes field mmf (fm) to reduce and
rotor angle to increase towards 90 degree, the theoretical
operation of stable generation operation. Therefore a
machine operates well within its stability limit factor
with lagging power factor.
Transformer operation does not depend on power factor. For
that reason it is rated in KVA.
 
Is This Answer Correct ?    23 Yes 5 No
Rabi
 
Answer
# 2
Leading power factor makes the current leading the voltage
it does not affect the transofmer but it affects the
D.G./Power generation unit. As for the power generation we
need to excite the excitor field which take the sensing
reference voltage from the output line of the generator.In
case of leading power factor the voltage will not dip on
increasing the load and hence the AVR will not be able to
excite the system properly.
 
Is This Answer Correct ?    15 Yes 2 No
Om Prakash
 
 
 
Answer
# 3
The transformer opration does not depends on the pf. The
major problem in leading pf is related to generation.
Stator end region heating depends on the pf. In leading pf
the altenator run at underexited operation and there is the
scope for flux to increase even over the saturation limit
of core. That causes the core heating on end region.
 
Is This Answer Correct ?    1 Yes 1 No
Deepak Chander
 
Answer
# 4
Leading power factor does affect the power Xmer within its
VA rating but it affects the D.G./a Generator unit.Due to
leading power factor the source excitation system runs in
under excited state and the deficit in excitation has to be
supplied by stator.Owing to this stator end core heating
problem observed.
 
Is This Answer Correct ?    0 Yes 3 No
Ramesh Kumar Gupta
 
Answer
# 5
SHAAN FROM MADURAI:

LEADING POWER FACTOR IN TRANSFORMER THERE ARE REDUCE
INDUCTIVE LOADS
 
Is This Answer Correct ?    2 Yes 8 No
Shaan
 
Answer
# 6
Leading power factor, means making Cos factor nearer to 1,
hence doing so you can achive the following,
1.partial reduction in load current hence losess get reduced
2.Efficency increases
 
Is This Answer Correct ?    3 Yes 11 No
Suresh
 
Answer
# 7
Leading power factor causes the the current to reduce,due to
which the generator gets overloaded at its full load capacity.
 
Is This Answer Correct ?    5 Yes 31 No
Guest
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
in DG synchronization system can i short R,Y,B- phase(DG-1) to R,Y,B Phase (DG-2), HOW IT WORK . WHAY WE NEED TO SYNCHRONIZATION.   1
25 kvar capacitor , how much current ? For 25 KVAR--Capacitor I = ?   3
types of arc quenching methodes   2
WHAT IS SITTING AMPS IN OVER-LOAD RELAY FOR 1PH OR 3PH MOTORS?IF ITS NAME PLATE GIVEN MAX AMPS 10AMPS?   1
Mathemetical Relation Between KWRH and KWH? UPPCL 3
which type of motor we are using in local train??? Asia-MotorWorks-AMW 4
We have one 500KVA transformer. We have tested REF relay and commissioned. After one and half year, due to some ground fault in one of the DB circuit Transformer tripped by REF relay. What will be cause and remedy. Please advise?   1
how to calculate kA rating of device? Siemens 3
In india the power supply is always in multiple of 11, eg.220 V, 440 V... what is the reason? L&T 11
what is rating providing of contactor,relay,fuse unit for motor output power   2
low voltage means how much voltage? extra low voltage means how much voltage? medium voltage means hos much voltage? high voltage means how much voltage? Ex: low voltage - 1volt to 240volt like this   3
DISCUSS THE SHAFT MOUNTED D.C. GENERATOR ,BASED ON EXCITATION SYSTEM IN ELECTRICAL SYSTRM   2
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com