Coast Guard Question 1431

sa sailorpip · Dec 18, 2014 4:10pm

I was wondering if someone could shed some light on this one.?

A three-phase alternator is developing 300 amps, with a 0.8 power factor, at 450 volts. The true indicated power on the kilowatt meter, located on the main switchboard, will be ____________.

A) 133 kw
B) 155 kw
C) 187 kw (Correct answer)
D) 212 kw

Hm.. I was under the impression Amps x Volts = Watts, so I multiplied the two and came up with 135k, which led me to suspect A. But then I figured, maybe it has to do with the .8 power factor? So I divided by .8 and came up with 168,750. I think I'm way off the mark here.

Sh Shawn · Dec 18, 2014 4:52pm

Salorpip,

I've adjusted your post so its more readable and also searched the database for your question. Also, the question you've posted no longer exists in the Coast Guard question bank.

jj jjwallace · Dec 19, 2014 5:54pm

Testing

sa sailorpip · Dec 22, 2014 9:41am

That's the best possible solution! Thanks.