9. A manufacturing plant has a 600V, 60Hz supply and the following loads: Lights

Question

9.     A manufacturing plant has a 600V, 60Hz supply and the following loads:

Lights: 24kW

Electric furnace: 4.8 + j6.4%u03A9 with a current of 150A

Motor loads, 160kW at 0.8 Power Factor, lagging.

The total real power PT is

Answer

24 KW

108 KW

184 KW

292 KW

10.     For the conditions in question 9, what is the total reactive power QT?

Answer

120 kVARS

144 kVARS

264 kVARS

592 kVARS

11.      For the conditions in problem 9, what is the total apparent power S?

Answer

  264 kVA

  318 kVA

  394 kVA

  421 kVA

24 KW

108 KW

184 KW

292 KW

Explanation / Answer

9)Pt = total power = 24 + 150^2*2.8 +160   = 292 kw

10) Reactive power = 150^2*6.4 + 160(1-0.8^2)60.5/0.8 = 144 + 120 =264 k VARs

11.)total apparent power = [292^2+264^2]]^0.5 =

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