Answer / rabindra kumar

because motor gives mechanical power as output, where as transformer
n alternator give electrical power as output.

Answer / sanju

All depend on power factor.

Answer / jagu

Transformer is independent of pf.Hence the transformer rating is always expressed in KVA.
In Motor the pf is dependent on percentage loading & hence expressed in KW.

Answer / brd ganesh

All ac sources are rated in kva where alternator
&transformer and all ac loads are rated in kw
where motor

Answer / ritika

motor manufacture ki marji.
alternator manufacture ki marji.

Answer / prasanna

becoz iron losses depends on voltage and copperlosses depends on current.....so the motor rating is in KVA

can anyone explain 11kV 3core cable megger,hi pot test procedure with connection details?

0 Answers  

will the power consumption remains the same when speed of the fan cnanges??if so y??

2 Answers  

ups battery design formula

0 Answers   Amara Raja,

Why HT motor is connected in Star?

3 Answers   Equate,

why d.c motor speed decress with increass in load?

1 Answers  

Any one Give me formula for to increse the power factor, 0.8 to 0.95, How much the KVAr Required

9 Answers   Emerson, Rajshree Sugars, Siemens,

how to find insulation resistance of a motor(415v) by theoretical formula??

2 Answers  

The efficiency of a 100kva transformer is 0.98 at full load as well as half load , for this transformer what is the Copper loss at full load ?

0 Answers  

What difference between ref protection and differential protection ?

0 Answers   EPC, INEL Power System Engineers,

Why the brushes used in dc machines are made of carbon not from other metal?

3 Answers  

What happens with squirrel induction machines if the ends of rotor conductors are kept open? Explain

3 Answers  

For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.

3 Answers