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Question 3 (20 marks) (a) Brielly explain what is the per-unit system. (5 marks) (3 marks)...
QUESTION 5 a) Define the Per Unit system and list three (3) main reasons of using Per Unit system...
Per unit calculation
QUESTION 5 a) Define the Per Unit system and list three (3) main reasons of using Per Unit systemm. (5 marks) b) A three-bus power with two generator system is shown in figure Q2 (b). The 3-phase power and line-line voltage ratings are given below Ti T2 J40 2 Gi G2 j25 Ω 25 Ω Ty Figure Q2 (b) GI: 750 MVA, 18 kV, X 7% G2: 750 MVA, 18 kV, X-15% Motor: 1500 MVA, 20 kV,...
Q.1. /60 marks) A voltage is exerted on a resistor with a nominal stated value of 5 Ω d: 0.05%. d...
Q.1. /60 marks) A voltage is exerted on a resistor with a nominal stated value of 5 Ω d: 0.05%. dissipation is to be calculated from P-UPIR, where U is the voltage, R is the resistance. The values of uand / are 25 V 196 and 5 A 1%, respectively. ) Calculate the uncertainty in the power dissipation. (20) 2) Give a different way to calculate the power dissipation and calculate its uncertainty. (25) 3) Comparing the two cases above,...
Show you work. All answers should be given with two decimal places. 1. A current of...
Show you work. All answers should be given with two decimal places. 1. A current of 3.33 mA (IMA -0.001A) passes through a resistor which is at a temperature 22.3 °C. As a result, a voltage of 3.00 Volts is generated across the resistor. Calculate the resistance of the resistor in k 2. Rrom 2. Now the same resistor as in question 1 is immersed in liquid nitrogen (T--195.8 °C). The voltage across the resistor is still 3.00V but the...
Pease answer questions 4 and 5! Thank you so much! 4. Connect the 2nd resistor in...
Pease answer questions 4 and 5! Thank you so much!
4. Connect the 2nd resistor in parallel with the 1st
resistor and connect that combination to the battery.
Measure
the following:
The
current passing through the R1, I1 = ___0.0058____ A
The
current passing through the R2, I2 = ___0.0031____ A
The
current supplied by the battery, I = ___0.0092____ A
Calculate I1 + I2 = ____________ A
Is the following statement true? I = I1 +...
Q1. (3 marks) In the circuit shown below, R-1.5KO and the voltage drop across Ri is...
Q1. (3 marks) In the circuit shown below, R-1.5KO and the voltage drop across Ri is 4.5V. (1 pt.) A. What is the voltage drop across R? (1 pt.) B. What is the value of the resistance R? (1 pt.) C. What is the power delivered by the source voltage? S Answer: wwiw R Ri Vs=15V Q2. (3 marks) Refer to the circuit below. A. Using the voltage divider law, find the voltage between the points A and B. B....
Multiple Choices: 1pt _1. If the resistance of a copper wire is 1002 at 20°C, what...
Multiple Choices: 1pt _1. If the resistance of a copper wire is 1002 at 20°C, what is its resistance at 60°C? A. 11662 B. 12522 C. 13492 D. 14322 2. Three resistors of 2022, 60 2 and 100 are connected in parallel. The current through the 100 2 is 120mA. Determine the current through 2012 resistor, A. 1000mA B. 800mA 600mA D. 400mA 3. Three resistors of 6 ohm resistance are connected in delta. Determine the measured resistance of an...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...
Question [5x2 marks 10 marks] In the circuit in Figure 4, the resistance value R1, R2,...
Question [5x2 marks 10 marks] In the circuit in Figure 4, the resistance value R1, R2, R3 and R4 have a value of 30, 40, 40 and 50 (a) Find the equivalent resistance (Req) in the circuit (b) Determine the current through each resistance 1 to 14. (c) Determine the power dissipated by each resistor and the power delivered by the independence voltage source. Confirm that the power delivered by the independent source is the same as the power absorbed...
Question 1 a) Calculate the Effective Resistance of the circuit and total current of the network...
Question 1 a) Calculate the Effective Resistance of the circuit and total current of the network in figure 1 (5 marks) b) Calculate the Effective Resistance of the Network of Resistors in figure 2 (5 marks) Total 10 marks Space to answer Question 1 here + 9V R 90 92 SRZ 45 32 Rz 180 32 Figure 1: 10 10 102 102 А 320 3202 320 19 B Figure 2 Question 2 a) Explain the assumptions made in the definition...
QUESTION 1 [TOTAL 10 Marks) (a) A coil of 20 resistance is joined in parallel with...
QUESTION 1 [TOTAL 10 Marks) (a) A coil of 20 resistance is joined in parallel with a coil of RA resistance. This combination is then joined in series with a piece of apparatus A, and the whole circuit connected to 110 V mains. What must be the value of R so that A shall dissipate 600 W with 10 A passing through it? [5 Marks) resistor in (b) Using Thevenin's Theorem, calculate the current through the 30 Figure 1. 15...
Per unit calculation
QUESTION 5 a) Define the Per Unit system and list three (3) main reasons of using Per Unit systemm. (5 marks) b) A three-bus power with two generator system is shown in figure Q2 (b). The 3-phase power and line-line voltage ratings are given below Ti T2 J40 2 Gi G2 j25 Ω 25 Ω Ty Figure Q2 (b) GI: 750 MVA, 18 kV, X 7% G2: 750 MVA, 18 kV, X-15% Motor: 1500 MVA, 20 kV,...
Q.1. /60 marks) A voltage is exerted on a resistor with a nominal stated value of 5 Ω d: 0.05%. dissipation is to be calculated from P-UPIR, where U is the voltage, R is the resistance. The values of uand / are 25 V 196 and 5 A 1%, respectively. ) Calculate the uncertainty in the power dissipation. (20) 2) Give a different way to calculate the power dissipation and calculate its uncertainty. (25) 3) Comparing the two cases above,...
Show you work. All answers should be given with two decimal places. 1. A current of 3.33 mA (IMA -0.001A) passes through a resistor which is at a temperature 22.3 °C. As a result, a voltage of 3.00 Volts is generated across the resistor. Calculate the resistance of the resistor in k 2. Rrom 2. Now the same resistor as in question 1 is immersed in liquid nitrogen (T--195.8 °C). The voltage across the resistor is still 3.00V but the...
Pease answer questions 4 and 5! Thank you so much!
4. Connect the 2nd resistor in parallel with the 1st
resistor and connect that combination to the battery.
Measure
the following:
The
current passing through the R1, I1 = ___0.0058____ A
The
current passing through the R2, I2 = ___0.0031____ A
The
current supplied by the battery, I = ___0.0092____ A
Calculate I1 + I2 = ____________ A
Is the following statement true? I = I1 +...
Q1. (3 marks) In the circuit shown below, R-1.5KO and the voltage drop across Ri is 4.5V. (1 pt.) A. What is the voltage drop across R? (1 pt.) B. What is the value of the resistance R? (1 pt.) C. What is the power delivered by the source voltage? S Answer: wwiw R Ri Vs=15V Q2. (3 marks) Refer to the circuit below. A. Using the voltage divider law, find the voltage between the points A and B. B....
Multiple Choices: 1pt _1. If the resistance of a copper wire is 1002 at 20°C, what is its resistance at 60°C? A. 11662 B. 12522 C. 13492 D. 14322 2. Three resistors of 2022, 60 2 and 100 are connected in parallel. The current through the 100 2 is 120mA. Determine the current through 2012 resistor, A. 1000mA B. 800mA 600mA D. 400mA 3. Three resistors of 6 ohm resistance are connected in delta. Determine the measured resistance of an...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...
Question [5x2 marks 10 marks] In the circuit in Figure 4, the resistance value R1, R2, R3 and R4 have a value of 30, 40, 40 and 50 (a) Find the equivalent resistance (Req) in the circuit (b) Determine the current through each resistance 1 to 14. (c) Determine the power dissipated by each resistor and the power delivered by the independence voltage source. Confirm that the power delivered by the independent source is the same as the power absorbed...
Question 1 a) Calculate the Effective Resistance of the circuit and total current of the network in figure 1 (5 marks) b) Calculate the Effective Resistance of the Network of Resistors in figure 2 (5 marks) Total 10 marks Space to answer Question 1 here + 9V R 90 92 SRZ 45 32 Rz 180 32 Figure 1: 10 10 102 102 А 320 3202 320 19 B Figure 2 Question 2 a) Explain the assumptions made in the definition...
QUESTION 1 [TOTAL 10 Marks) (a) A coil of 20 resistance is joined in parallel with a coil of RA resistance. This combination is then joined in series with a piece of apparatus A, and the whole circuit connected to 110 V mains. What must be the value of R so that A shall dissipate 600 W with 10 A passing through it? [5 Marks) resistor in (b) Using Thevenin's Theorem, calculate the current through the 30 Figure 1. 15...
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