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which of the following are power losses in a dc motor
QUESTION 3 What is the...
Question Completion Status: QUESTION 24 Consider the circuit below and answer the following questions. In this...
Question Completion Status: QUESTION 24 Consider the circuit below and answer the following questions. In this sketch, V=5 V, R1=100, R2=300, and R3=400 2. -M R < a) What is the equivalent resistance of the circuit? b) How much current is drawn from the battery? c) How much power is dissipated by R3? Please write your answers in the space below and email your work. Τ Τ Τ Arial 3 (12pt) Words:0 Path:p LECTION 25 Save All Answers Close Wind...
QUESTION 18 120V 30 40 ohms ohms What is the apparent power (total VA) of the...
QUESTION 18 120V 30 40 ohms ohms What is the apparent power (total VA) of the circuit? a. 240 VA b.360 VA C 600 VA d. 850 VA QUESTION 19 Click Save and Submit to save and submit. Click Save All Answers to save all ans O Type here to search
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an...
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an armature resistance of 0.1 ohm, is delivering 80 % of rated power to the mains at rated voltage when being run at 1000 r.p.m. (revolutions per minute). The field circuit resistance is 220 ohms. The brush contact drop is 0.5 V and rotational (mechanical) losses are 750 W Calculate The induced voltage The electromagnetic torque developed The shaft torque The overall efficiency B) (15...
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Qu...
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Question-4: Calculate the speed regulation (full load - 12 lbf.in) using the equation: 2-143) 143 (no load Regulation (full load speed) Speed regulation- % Part-II - Motor Efficiency Calculation: Set the dynamometer control knob at its full CW position (to provide the maximum starting load for the shunt-wound motor). Turn on the power...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated output power of Shp at 1000rpm, drawing 25A. Having Ra=0.50 and RF = 10092, find: a) The total rotational losses of the motor at rated conditions [4 marks] b) The no-load speed of the motor at 2001. [6 marks] Answer:
2) A 460 V, 4-pole, 60 Hz, Y-connected, 40 hp, design class A induction motor is tested with the following results: No-load: 460 V, 8.7 A, 2500 W. 60 Hz Locked rotor: 42 V.48 A, 31 10 W. 12 Hz DC tes...
2) A 460 V, 4-pole, 60 Hz, Y-connected, 40 hp, design class A induction motor is tested with the following results: No-load: 460 V, 8.7 A, 2500 W. 60 Hz Locked rotor: 42 V.48 A, 31 10 W. 12 Hz DC test: 24 V, 48 A Find the equivalent circuit of this motor (Ri, Ro. Xi. X. XM) and its rotational losses. (20 points) X, and A2 as functions of XL Retor Design Wound rotor Design A Design B Design...
Question 4: Repeat question 3 if the motor is rotating in the reverse direction, with the...
Question 4: Repeat question 3 if the motor is rotating in the reverse direction, with the same current draw and the same induced emi E, value of the opposite polarity. Question 4 Jo = Vo ut i aud dar + 2 h ahl de- / - 3 Vo=EatRaI. Question 3: A switch-mode de de converter is operating at a switching frequency of 20 kHz, and V-150 V. The average current being drawn by the de motor is 8.0 A. In...
Open/short circuit of star connected motor question help
Question: The equivalent circuit parameters of a 440 V, 3-phase, 8-poles, and 50 Hz star connected motor are given below. The short-circuit test is conducted with a locked rotor and a line current of 80 A. The open-circuit test is conducted by supplying the stator winding at rated voltage and at the same time driving the rotor in the same direction as the rotating field, at synchronous speed; s=0.R1 = 0.1, X1 = 0.5, RI2 = 0.1, XI2 = 0.5,...
Question (3) Speed Control [10 Marks A 50 hp, 220 V, 1500 rpm DC shunt motor...
Question (3) Speed Control [10 Marks A 50 hp, 220 V, 1500 rpm DC shunt motor with an armature resistance of 0.04 Q and a field resistance of 50 Q. The motor has compensating windings, so armature reactance can be ignored. Mechanical and core losses may be ignored also. The moter is driving a load toque that is proportional with speed, Ti a (n). The motor is driving a load with a line current of 80 A and an initial...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. 15 MARKS b) The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. No-load test Vyt = 450 V Ini - 30 A PNL-4.6 kW Table...
Question Completion Status: QUESTION 24 Consider the circuit below and answer the following questions. In this sketch, V=5 V, R1=100, R2=300, and R3=400 2. -M R < a) What is the equivalent resistance of the circuit? b) How much current is drawn from the battery? c) How much power is dissipated by R3? Please write your answers in the space below and email your work. Τ Τ Τ Arial 3 (12pt) Words:0 Path:p LECTION 25 Save All Answers Close Wind...
QUESTION 18 120V 30 40 ohms ohms What is the apparent power (total VA) of the circuit? a. 240 VA b.360 VA C 600 VA d. 850 VA QUESTION 19 Click Save and Submit to save and submit. Click Save All Answers to save all ans O Type here to search
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an armature resistance of 0.1 ohm, is delivering 80 % of rated power to the mains at rated voltage when being run at 1000 r.p.m. (revolutions per minute). The field circuit resistance is 220 ohms. The brush contact drop is 0.5 V and rotational (mechanical) losses are 750 W Calculate The induced voltage The electromagnetic torque developed The shaft torque The overall efficiency B) (15...
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Question-4: Calculate the speed regulation (full load - 12 lbf.in) using the equation: 2-143) 143 (no load Regulation (full load speed) Speed regulation- % Part-II - Motor Efficiency Calculation: Set the dynamometer control knob at its full CW position (to provide the maximum starting load for the shunt-wound motor). Turn on the power...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated output power of Shp at 1000rpm, drawing 25A. Having Ra=0.50 and RF = 10092, find: a) The total rotational losses of the motor at rated conditions [4 marks] b) The no-load speed of the motor at 2001. [6 marks] Answer:
2) A 460 V, 4-pole, 60 Hz, Y-connected, 40 hp, design class A induction motor is tested with the following results: No-load: 460 V, 8.7 A, 2500 W. 60 Hz Locked rotor: 42 V.48 A, 31 10 W. 12 Hz DC test: 24 V, 48 A Find the equivalent circuit of this motor (Ri, Ro. Xi. X. XM) and its rotational losses. (20 points) X, and A2 as functions of XL Retor Design Wound rotor Design A Design B Design...
Question 4: Repeat question 3 if the motor is rotating in the reverse direction, with the same current draw and the same induced emi E, value of the opposite polarity. Question 4 Jo = Vo ut i aud dar + 2 h ahl de- / - 3 Vo=EatRaI. Question 3: A switch-mode de de converter is operating at a switching frequency of 20 kHz, and V-150 V. The average current being drawn by the de motor is 8.0 A. In...
Question (3) Speed Control [10 Marks A 50 hp, 220 V, 1500 rpm DC shunt motor with an armature resistance of 0.04 Q and a field resistance of 50 Q. The motor has compensating windings, so armature reactance can be ignored. Mechanical and core losses may be ignored also. The moter is driving a load toque that is proportional with speed, Ti a (n). The motor is driving a load with a line current of 80 A and an initial...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. 15 MARKS b) The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. No-load test Vyt = 450 V Ini - 30 A PNL-4.6 kW Table...
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