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1. ### Question about transformer impedance?

Read transformer quality testing by Inderjit Gupta. See snap shots or snippets in google books

2 Answers · Science & Mathematics · 01/09/2014

2. ### Vector operations: see attached problem?

... by that square relationship they must follow Pythagoras'theorem and hence Pf must be the Hypotenuse of a right angled triangle with other side...

2 Answers · Science & Mathematics · 01/08/2014

3. ### Approximately how much current can a 2-kW generator reliably deliver at 117 V?

... at any power factor; however, this will be 2000 watts only when the PF is 1.

4 Answers · Science & Mathematics · 21/07/2014

4. ### An appliance takes a current of 45A at 0.2 power factor lagging. Determine the current to be taken by a bank of capacitors in order to impro?

...volt amperes reactive) P = S*cos78.5 = 2,160W When pf = 0.6 => S = 2,160/0.6 = 3,600VA => Q = √3600²...

1 Answers · Science & Mathematics · 09/07/2014

5. ### A single-phase load of 20kW at a power factor of 0.72 is supplied at 240V a.c. Calculate the decrease in current if the power factor is?

... = S*cosθ and Q = S*sinθ and we know that the power factor pf = cosθ So we can write P/cosθ = S => S = 20,000/0.72...

2 Answers · Science & Mathematics · 08/07/2014

6. ### The current drawn by the load is 3.5/_21.3 A & the voltage across the load is 73/_10 V. Find the power factor?

theta = angle of voltage - angle of current; PF = |cos φ| =| cos (10 - 21.3 ) | = cos(-11.3) = 0.98; at least study this: http://www.rapidtables.com/electric/Power_Factor.htm#power%20factor%20calculation

1 Answers · Science & Mathematics · 30/06/2014

7. ### Engineering / Problem solving reading suggestions?

Ship of Gold is a great book. You might try the books by Henry Petroski. There are several good books on the Wright brothers and finally there is Empires of Light which...

3 Answers · Science & Mathematics · 26/06/2014

8. ### How to see the parameters of the LED Light Panel?

... diffuser Beam Angle: 120° Power Factor(PF): 0.9 Net Weight: 3.2kg/piece Gross Weight: 3.6kg...

2 Answers · Science & Mathematics · 15/06/2014

9. ### 3 Phase Unbalanced Question?

Calculate the line currents first L1 has a line current of 50 amps = 20,000 VA/400 V, the 0.88 power factor means the current is lagging by 28.36 degrees, the inverse cosine of 0.88. The L1 current...

2 Answers · Science & Mathematics · 17/05/2014

10. ### what is the meaning of a 400V,250KVA,0.8 PF lagging,2-pole,3-phase,60Hz synchronous generator?

... in KVA, not watts, due to the influence of power factor. *0.8 PF means that the generator is designed for a reactive (inductive or...

2 Answers · Science & Mathematics · 09/05/2014