Circuit II Lab - Resistive Load of the System - Power Triangle - Engineering Assignment Help

Assignment Task:

Circuit II Lab

PART 1: (Two Port Network) (10 Marks) 

1.1) Use PSPICE to assemble and simulate the circuit in figure 1. Take the screenshot of your circuit  and your output file (when I2 = 0 and I1 = 0) and paste it in word document.  

 Use Voltage source Vac = 8Vp and frequency = 2Khz (2 Marks) 

 Figure 1 

1.2) Complete table 1 below, write both the magnitude and phase. (4 Marks)   

I2=0 I1=0 

V1=8∠0 V2= 8∠0 

V2= V1=  

I1= I2= 

Q1c) Determine the Z parameter Z11, Z12,Z21 and Z22 (4 Marks) 

Z11=   

Z21= 

Z12= Z22=

Part 2 

______2.1. Figure 2 shows the power triangle of a given circuit. This means that the   power factor of the circuits is: (2 Marks) a. Unity Power Factor c. Leading Power Factor b. Lagging Power Factor d. None of the above. 

2.2. In figure 3, the balance load of the Y-Y connected load is 0.141A/-45. If the   line to line voltage of the source is 208 volts What is the resistive load of the   system? Use VAN as reference phasor. (2 Marks)  (show solution for your answer to obtain 2 marks) 

 Figure 3 

 a.) 1100 Ω c.) 900 Ω 

 b.) 600 Ω d.) 1475 Ω 

2.3.) In the ciruit of question 2.2, what is the phase shift between Ia and the   voltage Vbc? (2 Marks)  (show solution for your answer to obtain 2 marks) 

a.) 165 degrees c.)120 degrees 

b.) 75 degrees d.) 45 degrees

2.4. If the load impedance per phase of figure 3 will be reconnected to a balance   three Phase Y-Δ connection, what will be the new load impedance per   phase that you so that the line current will be the same if the source line to  line voltage is the same at 208Volts. (2 Marks)  (show solution for your answer to obtain 2 marks) 

 a.) 284 /45 Ω c.) 284 /-45 Ω   b.) 2556 /45 Ω d.) 2556 /-45 Solution: 

 _ 2.5 In a three phase ABC phase sequence power system. Which of the   Following is not correct. (2 Marks) 

 a.) Vb is leading Va by 120 electrical degrees. 

b.) Vc is lagging Va by 120 electrical degrees. 

c.) Vb lis lagging Vc by 120 electrical degrees. 

d.) Va is leading Vb by120 electrical degrees.

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