Answer / k.prakashchandra

The pf is the reason ,as ac power output of alternator is
=Kvaxpf whereas the pf of dc motor is always unity and Kva
=Kw

Answer / hemraj

generally,the rating of any machine is decide by losses of
that machine depends on what factor.losses in gen. are
depend only on generated voltage & gen. current. so rating
of gen. is in kva.
in dc motor losses are depend on voltage & current and this
losses are also depend on application of dc motor i.e power
factor of load which is connected to that dc motor. so
rating of dc motor is in kw.

Answer / sukant

generally in case of generator n motor d rating shows d output power....in generator we get electrical energy as output having both active n reactive power.so its better 2 show in kva rating.....bt in case of motor we get mechanical power as output.....so it is represented as kw not kva............am i right???????????

Answer / sukesh

as we know that rating of any machine is decided by its temp
rise.temp rise due to the presence of losses in the t/f.
2 losses are there .one is iron loss and other one copper loss.
\iron loss depends on voltage.(v.i).
cu-loss depends on current.(i2.r).
so rating of t/f as well as generator both is in kva.
and for dc motor see the reply of HEMRAJ.

Answer / sathishkumar

generator is a source and the losses only due to current
(iron loss) and voltage (copper loss) so there is no power
factor involved so capacity is P=V*I in terms of KVA.
where as in motor there is either inductive load(laaging
P.F)or capacitive load(leading P.F)involved so capacity is
P=V*I*power factor i.e interms of KW.

Answer / raman singh panwar

in gen. losses depend on voltage and current thus its rating is given in KVA.
but in dc motor the losses depend on voltage,current and power factor thus its rating is given in KW.

Answer / man

the load of generator is always a mechanical load which do
not bring about any appreciable change in the power
factor.hence its rating is in KVA.where as in motor the load
is electrical load and it brings about change in power factor
so its rating is in KW.

i wanna know that star point in transformer becomes as a neutral on secondary side now tell me that how is that possible?because if joit the all three winding ends with each other it can b short circuited.dut it doesn't.WHY?pls Answer me in brief.thanks alot

1 Answers  

if two transformers are parallel & both have fault short ckt. impedance of 50KA in each case will it increase or decrease show example?

1 Answers  

What are the diferences between ELCB and RCCB

5 Answers   L&T,

Draw the line diagram of diffretial relay connected to transformer?

0 Answers   NTPC,

i want wipro vlsi placement pattern please send me

0 Answers  

What is the difference between reverse power trip & inadvertant trip?

1 Answers  

What are the symptoms of a bad PG card of a drive (inverter) esp. of Yaskawa Ac Drives (inverters) G7 ?

0 Answers  

effect of decrease in excitation?

2 Answers  

what is the role of energy meter in distribution system ???? technical and non technical losses in distribution system????

1 Answers  

diff between synchronous gen and alternators

1 Answers  

hi plz send me reliance placement papers..i.e electrical technical papers that have been asked in reliance test.

0 Answers  

what is the function of avr when synchronous generator act as synchronous motor

1 Answers