Homework Answers
I) leading power factor
II) unity power factor
III) LAGGING Power factor
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Question 1 Load and Power Factor (Constant Rotor Field, E < V) Load and Power Factor...
1000 VAR QUESTION 5 A load has a impedance of 8+j6, what will be the power...
1000 VAR QUESTION 5 A load has a impedance of 8+j6, what will be the power factor of the load 0.8 leading 0.8 leading 08 lagging O 0 6 lagging Click Save and Submit to save and submit. Click Save All Answers to save all answers.
please answer 13.16 at rated load of unity power factor and rated terminal voltage, determine efficienc...
please answer 13.16
at rated load of unity power factor and rated terminal voltage, determine efficienc including field rheostat loss. Ans. 93.139 13.11 A generator under test is rated at 100 KVA, 3-phase, 60-Hz; 2,400 volts. (a) If driven b a de motor unexcited, the motor output is 1.26 KW. (b) If driven by a de motor, generato on open circuit and excited to generate rated potential, the motor output is 2.5 KW. ( Ifdriven by a de motor, generator...
Problem 3 (25p) A 120-V, 60-Hz, three-phase, Y-connected, 6 poles, wound-rotor, synchronous motor has a synchronous...
Problem 3 (25p) A 120-V, 60-Hz, three-phase, Y-connected, 6 poles, wound-rotor, synchronous motor has a synchronous reactance of 3 ohms. The motor takes a current of 10 A at 0.8 pf leading when operating at a certain field current. The load is gradually increased until the motor develops its maximum torque while the field current is held constant. Determine: a) The new line current b) The power factor c) Torque developed by the motor
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the KVAR rating of each individual capacitor needed to bring power factor to 0.9. (c) Determine the capacitance of each capacitor in uF.
Problem 3 (25 p) A 120-V, 60-Hz, three-phase, Y-connected, 6 poles, wound-rotor, synchronous motor has a...
Problem 3 (25 p) A 120-V, 60-Hz, three-phase, Y-connected, 6 poles, wound-rotor, synchronous motor has a synchronous reactance of 3 ohms. The motor takes a current of 10 A at 0.8 pf leading when operating at a certain field current. The load is gradually increased until the motor develops its maximum torque while the field current is held constant. Determine: a) The new line current b) The power factor c) Torque developed by the motor
Not yet answered P Flag question Question 3 Marked out of 15.00 A 240 V source...
Not yet answered P Flag question Question 3 Marked out of 15.00 A 240 V source energizes the parallel combination of a purely resistive 6 kW heater and an induction motor that draws 7 kVA at 0.8 lagging power factor. The overall load power factor is: Select one or more: a. pf = 0.94 (Leading) b. pf = 19.99 c. pf = 0.94 (lagging) d. pf = 0.34 (Lagging)
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected Q2. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the kVAR rating of each individual capacitor needed to bring power factor to 0.9 (c) Determine the capacitance of each capacitor in μF.
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit...
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and a per-unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is impedance is j80 per unit. a. Find the equivalent circuit referred to the low-voltage side of this transformer. b. Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. c. Assume that the primary voltage of...
P2. (50p) A 100 kVA, 400 V synchronous machine has the following equivalent circuit parameters: X,...
P2. (50p) A 100 kVA, 400 V synchronous machine has the following equivalent circuit parameters: X, = 2.0.2, R = 0.25 12, PART 1: When the machine is operating as a generator and connected to the infinite bus. a. (10p) What should be the power factor to have zero voltage regulation at 50% load (draw the phasor diagram)? b. (10p) Calculate the percent voltage regulation at full load with 0.9 leading power factor (draw the phasor diagram). PART 2: When...
1000 VAR QUESTION 5 A load has a impedance of 8+j6, what will be the power factor of the load 0.8 leading 0.8 leading 08 lagging O 0 6 lagging Click Save and Submit to save and submit. Click Save All Answers to save all answers.
please answer 13.16
at rated load of unity power factor and rated terminal voltage, determine efficienc including field rheostat loss. Ans. 93.139 13.11 A generator under test is rated at 100 KVA, 3-phase, 60-Hz; 2,400 volts. (a) If driven b a de motor unexcited, the motor output is 1.26 KW. (b) If driven by a de motor, generato on open circuit and excited to generate rated potential, the motor output is 2.5 KW. ( Ifdriven by a de motor, generator...
Problem 3 (25p) A 120-V, 60-Hz, three-phase, Y-connected, 6 poles, wound-rotor, synchronous motor has a synchronous reactance of 3 ohms. The motor takes a current of 10 A at 0.8 pf leading when operating at a certain field current. The load is gradually increased until the motor develops its maximum torque while the field current is held constant. Determine: a) The new line current b) The power factor c) Torque developed by the motor
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the KVAR rating of each individual capacitor needed to bring power factor to 0.9. (c) Determine the capacitance of each capacitor in uF.
Problem 3 (25 p) A 120-V, 60-Hz, three-phase, Y-connected, 6 poles, wound-rotor, synchronous motor has a synchronous reactance of 3 ohms. The motor takes a current of 10 A at 0.8 pf leading when operating at a certain field current. The load is gradually increased until the motor develops its maximum torque while the field current is held constant. Determine: a) The new line current b) The power factor c) Torque developed by the motor
Not yet answered P Flag question Question 3 Marked out of 15.00 A 240 V source energizes the parallel combination of a purely resistive 6 kW heater and an induction motor that draws 7 kVA at 0.8 lagging power factor. The overall load power factor is: Select one or more: a. pf = 0.94 (Leading) b. pf = 19.99 c. pf = 0.94 (lagging) d. pf = 0.34 (Lagging)
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and a per-unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is impedance is j80 per unit. a. Find the equivalent circuit referred to the low-voltage side of this transformer. b. Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. c. Assume that the primary voltage of...
P2. (50p) A 100 kVA, 400 V synchronous machine has the following equivalent circuit parameters: X, = 2.0.2, R = 0.25 12, PART 1: When the machine is operating as a generator and connected to the infinite bus. a. (10p) What should be the power factor to have zero voltage regulation at 50% load (draw the phasor diagram)? b. (10p) Calculate the percent voltage regulation at full load with 0.9 leading power factor (draw the phasor diagram). PART 2: When...
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