effeciency question

[PoorFish]

Evening all

Any one got the right answer for this

If the output of a generator is 250 kva and the effiency is 83%.

What is the input?

a.23.2kw

b. 33.2kw

c. 43.2kw

d.53.2kw

I got 301.20kva

??????????????

cheers folks

P

 

[Andy™]

whats the PF? and either way, the output KVA of genny wont match the answers

And why would a genny have an input in KW? sure its not a motor or transformer?

 

[PoorFish]

Im just relaying the question exactly as I have been given it!!

And what do you mean by PF.

 

[Andy™]

power factor. without this, you cannot convert KVA to KW so cant get your answer.

and are you sure its not asking for the output? only thing that makes sense....

 

[PoorFish]

the only thing i missed was

if the "output POWER" of a generator is 250kva

 

[Andy™]

cant see any possible way of working this out.

 

[PoorFish]

no problem mate

thanks for looking anyway

 

[Doc]

I think the answer is b you need to transpose the equation so eff=output/input x 100% which when transposed = eff / out= x 100%=83/250x100 =33.2 i think thats how you do it

Doc