a) A motor has an armature resistance of 5.17 Ohm. If the motor draws 7.04 A...
a) A motor has an armature resistance of 5.17 Ohm. If the motor draws 7.04 A when running at full speed and connected to a 120 V supply line, how large is the back EMF?
b) What would the current in the motor be if the load causes it to run at half speed? Assume that the supply voltage is fixed.
Homework Answers
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a) A motor has an armature resistance of 5.17 Ohm. If the motor
draws 7.04 A...
1. A motor has an armature resistance of 3.00 Q. If it draws 5.00 A when...
1. A motor has an armature resistance of 3.00 Q. If it draws 5.00 A when running at full speed and connected to a 125 V line, how large is the back emf? Volts
The armature windings of a dc motor have a resistance of 8.0 Ω . The motor...
The armature windings of a dc motor have a resistance of 8.0 Ω . The motor is connected to a 120-V line, and when the motor reaches full speed against its normal load, the back emf is 108 V. The load is increased so it causes the motor to run at half speed. What will be the current in the motor in this case? (Express your answer to two significant figures and include the appropriate units.)
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a...
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
Show all working 1. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating...
Show all working 1. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating at a speed of 320 rpm. Then the developed useful torque is 2. A 4 pole, lap wound d.c. motor drawing an armature current of 20 A has 360 conductors. If the flux per pole is 0.015 Wb then the gross torque developed by the armature of motor is 3. A 220 V, d.c. motor draws an armature current of 20 A. Its armature...
A 120-V, series-wound motor has a field resistance of 4.0 and an armature resistance of...
A 120-V, series-wound motor has a field resistance of 4.0 and an armature resistance of 2.5 . (a) Determine the current drawn by the motor at the very instant it is switched on, i.e., when it has not started to rotate. (b) When it is operating at nominal speed, a back emf of 85.0 V is generated. How much current is drawn in this case? (c) What is the furnished mechanical power? (d) How much power is dissipated?...
FQ3 3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm...
FQ3
3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm field resistance runs at 1200 rpm and 100 Amp. of full load speed and armature current respectively. The motor has a brush contact drop of 2 volts. Find the motor full load torque and efficiency If the motor is to drive a pump that requires a torque of 150 NM, find the speed as the motor drives the given pump. a. b.
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a...
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
A d.c 220 V, shunt motor has an armature resistance of 1 Ω and a field...
A d.c 220 V, shunt motor has an armature resistance of 1 Ω and a field circuit resistance of 150 Ω. While running steadily from 220 V supply, its back emf is found to be 209 V. The motor is drawing a line current of:
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor h...
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor has a field (shunt) resistance of 150 Ω. The armature resistance of the motor is 0.1 Ω. When the motor speed is 1800 rpm (this is not the full-load speed), the relationship between the induced voltage
1. A motor has an armature resistance of 3.00 Q. If it draws 5.00 A when running at full speed and connected to a 125 V line, how large is the back emf? Volts
Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
FQ3
3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm field resistance runs at 1200 rpm and 100 Amp. of full load speed and armature current respectively. The motor has a brush contact drop of 2 volts. Find the motor full load torque and efficiency If the motor is to drive a pump that requires a torque of 150 NM, find the speed as the motor drives the given pump. a. b.
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
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