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1. (25 point) What is the principal difference between a synchronous machine and an induction machine?...
2. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display B=1....
2. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display B=1.6T 1-0.6m r=0.2m 0) bur B is a uniform magnetic field, aligned as shown. esot (a) Calculate the voltage induced in the rotating
2. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display B=1.6T 1-0.6m r=0.2m 0) bur B is a uniform magnetic field, aligned as shown. esot (a) Calculate the voltage induced in the rotating
Problem 7 (Chapter 5: Three-Phase Synchronous Motors) A 440 V, 124 HP, 4 poles, 50 Hz,...
Problem 7 (Chapter 5: Three-Phase Synchronous Motors) A 440 V, 124 HP, 4 poles, 50 Hz, 0.9 leading Power Factor, A-connected synchronous motor has an armature resistance of 0.05 12, and a synchronous reactance of 1.5 12. This motor is operating at its rated conditions with an efficiency of 92 %. 1. Calculate the electrical input power. 2. Find the RMS phase and line currents. 3. What is the reactive power consumed by or supplied by this motor? 4. Calculate...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a synchronous reactance of 0.6 and negligible armature resistance. Ignore the mechanical and core losses. The magnitude of the internal machine voltage is 480 V when the field current is 4 A. Assume magnetic linearity. Initially, the motor operates at the rated conditions. a) Find the speed of this motor. b) Find the armature and field currents. c) What is the developed torque? What is...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resis...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resistance and Xs-60/phase at rated terminal voltage The machine first runs as a generator in parallel with 3-phase, 400 V, 50 Hz power supply 111 Determine the generated voltage and torque angle of the machine operating as a generator, delivering rated kVA at 0 9 pf lagging Draw and label the corresponding phasor diagram for this condition 1 12 If the field excitation is increased by 18%...
please label each answer and write clearly 3 significant figures or correct power of 10 where...
please label each answer and write clearly
3 significant figures or correct power of 10 where
applicable.
Section 3 Bout A loop of wire sits in a uniform magnetic field, everywhere pointing toward you. Due to a changing magnetic flux through the loop, an induced current flows in the wire, clockwise as shown. The area of the loop is JO550 m, and the magnetic field initially has magnitude KO.410 T (a) Suppose that, over a time period of L..o0s, the...
1. (25 points) The following data are obtained from a 3-phase, 10MVA, 14kV, Y-connected synchronous machine....
1. (25 points) The following data are obtained from a 3-phase, 10MVA, 14kV, Y-connected synchronous machine. Field Current (A)Open-Circuit Voltage Short-Circuit Current line-to-line 8.0 12.0 16.0 19.2 21.6 250 375 500 625 750 100 150 200 250 300 In the DC test, a voltage of 50V is applied and the current is found to be 25A. Find the per-phase unsaturated synchronous reactance and armature resistance for the machine
A pair of conducting, parallel, frictionless rails is mounted on an insulating platform. The distance between...
A pair of conducting, parallel, frictionless rails is mounted on an insulating platform. The distance between the rails is L = 0.20 m. The rails are connected on one end by a R = 10.12 resistor. A conducting bar of mass 1.2 kg can slide on the rails without friction. When the conducting bar is at x = 0, the enclosed area of the loop is 0.03 m2. There is zero resistance in the conducting bar or rails. A uniform...
A conducting rod is being dragged along conducting rails, as shown in (Figure 1)
Part A A conducting rod is being dragged along conducting rails, as shown in (Figure 1). The magnetic field is directed out of the screen. In what direction does the induced current flow through the light bulb? There is no induced current. The induced current flows through the bulb from the left to the right. The induced current flows through the bulb from the right to the left. Part B A circular loop of conducting wire is moving through a uniform magnetic field, as...
problem #4 #7 4. Problem A long wire is bent to form a rectangular section and is placed in a region with a uniform...
problem #4 #7
4. Problem A long wire is bent to form a rectangular section and is placed in a region with a uniform magnetic id, as shown in Fig ure 27.4. The magnetic field is directed downward and has a magnitude of 2.5T. The wire carries a 25- A current. Find the net torque on the wire about the z-axis. 025m 5. Problem Figure 29.2 shows a stationary current loop next to a long, straight wire carrying a current...
A pair of conducting, parallel, frictionless rails is mounted on an insulating platform. The distance between...
A pair of conducting, parallel, frictionless rails is mounted on an insulating platform. The distance between the rails is L=0.30 m. A light conducting bar can slide on the rails without friction. When the conducting bar is at x = 0, the enclosed area of the loop is 0.03 m². There is zero resistance in the conducting bar or rails, the rails are connected on one end by a R=1.5 resistor. A uniform magnetic field of B -0.25 T is...
2. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display B=1.6T 1-0.6m r=0.2m 0) bur B is a uniform magnetic field, aligned as shown. esot (a) Calculate the voltage induced in the rotating
2. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display B=1.6T 1-0.6m r=0.2m 0) bur B is a uniform magnetic field, aligned as shown. esot (a) Calculate the voltage induced in the rotating
Problem 7 (Chapter 5: Three-Phase Synchronous Motors) A 440 V, 124 HP, 4 poles, 50 Hz, 0.9 leading Power Factor, A-connected synchronous motor has an armature resistance of 0.05 12, and a synchronous reactance of 1.5 12. This motor is operating at its rated conditions with an efficiency of 92 %. 1. Calculate the electrical input power. 2. Find the RMS phase and line currents. 3. What is the reactive power consumed by or supplied by this motor? 4. Calculate...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a synchronous reactance of 0.6 and negligible armature resistance. Ignore the mechanical and core losses. The magnitude of the internal machine voltage is 480 V when the field current is 4 A. Assume magnetic linearity. Initially, the motor operates at the rated conditions. a) Find the speed of this motor. b) Find the armature and field currents. c) What is the developed torque? What is...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resistance and Xs-60/phase at rated terminal voltage The machine first runs as a generator in parallel with 3-phase, 400 V, 50 Hz power supply 111 Determine the generated voltage and torque angle of the machine operating as a generator, delivering rated kVA at 0 9 pf lagging Draw and label the corresponding phasor diagram for this condition 1 12 If the field excitation is increased by 18%...
please label each answer and write clearly
3 significant figures or correct power of 10 where
applicable.
Section 3 Bout A loop of wire sits in a uniform magnetic field, everywhere pointing toward you. Due to a changing magnetic flux through the loop, an induced current flows in the wire, clockwise as shown. The area of the loop is JO550 m, and the magnetic field initially has magnitude KO.410 T (a) Suppose that, over a time period of L..o0s, the...
1. (25 points) The following data are obtained from a 3-phase, 10MVA, 14kV, Y-connected synchronous machine. Field Current (A)Open-Circuit Voltage Short-Circuit Current line-to-line 8.0 12.0 16.0 19.2 21.6 250 375 500 625 750 100 150 200 250 300 In the DC test, a voltage of 50V is applied and the current is found to be 25A. Find the per-phase unsaturated synchronous reactance and armature resistance for the machine
A pair of conducting, parallel, frictionless rails is mounted on an insulating platform. The distance between the rails is L = 0.20 m. The rails are connected on one end by a R = 10.12 resistor. A conducting bar of mass 1.2 kg can slide on the rails without friction. When the conducting bar is at x = 0, the enclosed area of the loop is 0.03 m2. There is zero resistance in the conducting bar or rails. A uniform...
Part A A conducting rod is being dragged along conducting rails, as shown in (Figure 1). The magnetic field is directed out of the screen. In what direction does the induced current flow through the light bulb? There is no induced current. The induced current flows through the bulb from the left to the right. The induced current flows through the bulb from the right to the left. Part B A circular loop of conducting wire is moving through a uniform magnetic field, as...
problem #4 #7
4. Problem A long wire is bent to form a rectangular section and is placed in a region with a uniform magnetic id, as shown in Fig ure 27.4. The magnetic field is directed downward and has a magnitude of 2.5T. The wire carries a 25- A current. Find the net torque on the wire about the z-axis. 025m 5. Problem Figure 29.2 shows a stationary current loop next to a long, straight wire carrying a current...
A pair of conducting, parallel, frictionless rails is mounted on an insulating platform. The distance between the rails is L=0.30 m. A light conducting bar can slide on the rails without friction. When the conducting bar is at x = 0, the enclosed area of the loop is 0.03 m². There is zero resistance in the conducting bar or rails, the rails are connected on one end by a R=1.5 resistor. A uniform magnetic field of B -0.25 T is...
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