A big electric motor has an inductance of 855mH. During a thunderstorm, a nearby lighting strike...
A big electric motor has an inductance of 855mH. During a thunderstorm, a nearby lighting strike causes a current surge in the power line of 278A/millisecond. What would be the voltage induced in the motor?
A) 325mV B) 325V C) 238kV D) 238V
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A big electric motor has an inductance of 855mH. During a
thunderstorm, a nearby lighting strike...
(11%) Problem 2: The winding of an AC electric motor has an inductance of 29 mH...
(11%) Problem 2: The winding of an AC electric motor has an inductance of 29 mH and a resistance of 19 2. The motor runs on a 60-Hz rms voltage of 120 V. 33% Part (a) What is the rms current that the motor draws, in amperes? Ims = 5.61 ✓ Correct! * 33% Part (b) By what angle, in degrees, does the current lag the input voltage? 33% Part (c) What is the capacitance, in microfarads, of the capacitor...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed an...
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Question 2 --/2 Our big lecture-table solenoid has 560 turns, each with 60 mm diameter, spaced...
Question 2 --/2 Our big lecture-table solenoid has 560 turns, each with 60 mm diameter, spaced tightly to only be 160 mm Long (left-to-right). The standard power-supply only needs 10.2 Volt to push 6.0 A current thru the solenoid wire, clockwise as seen from the right When turning off the power supply, we adjust the current to zero in 125 millisec. * read this * → [a) show that the magnetic field in the solenoid space used to be 0.02639...
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An electric motor with a resistance of 15Ω and an inductance of 53 mH is connected...
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QUESTION 3 Our big lecture-table solenoid has 560 tums, each with 60 mm diameter, spaced tightly...
QUESTION 3 Our big lecture-table solenoid has 560 tums, each with 60 mm diameter, spaced tightly to only be 160 mm Long (left-to-right) The standard power supply needs 10.2 Volt to push 6.0 A current thru the solenoid wire, clockwise as seen from the night [a) show that the magnetic field in the solenoid space used to be 0.02639 T leftward (-x)] [b) what direction is the induced electric field, inside the solenoid cylinder : 1) before turnoff: 2) during...
onsider a DC electric motor. Assume the armature inductance is negligible. Consider the harmature voltage ea...
onsider a DC electric motor. Assume the armature inductance is negligible. Consider the harmature voltage ea as the input and the angular displacement @t) as the ulput. By measuring an input and the system's response as functions of time, the transfer function is then found to be 10s(s +1) What are the motor time-constant and the motor gain? a. b. iIt the input is 2 u(l), find the output i.e. the angular displacement et) c. Find the angular speed o(t)
Problem #2 You have a 1000 W electric motor connected to a 200 Vms, 60 Hz...
Problem #2 You have a 1000 W electric motor connected to a 200 Vms, 60 Hz source, and the resulting power factor is 0.8 lagging. (Hint: Based on the units, is power rating of the motor real power or apparent power?) a. What is the voltage in terms of a phasor? b. By how many degrees does the current lag the voltage? c. What is the RMS current drawn by the motor? d. What is the current in terms of...
QUESTION 2 Our big lecture-table solenoid has 560 turns, each with 60 mm diameter, spaced tightly...
QUESTION 2 Our big lecture-table solenoid has 560 turns, each with 60 mm diameter, spaced tightly to only be 160 mm Long (left-to-right) The standard power supply only needs 10 2 Volt to push 6.0 A current thru the solenoid wire, clockwise as seen from the right When turning off the power supply, we adjust the current to zero in 125 millisec * read this - (a) show that the magnetic field in the solenoid space used to be 0.02639...
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.
(11%) Problem 2: The winding of an AC electric motor has an inductance of 29 mH and a resistance of 19 2. The motor runs on a 60-Hz rms voltage of 120 V. 33% Part (a) What is the rms current that the motor draws, in amperes? Ims = 5.61 ✓ Correct! * 33% Part (b) By what angle, in degrees, does the current lag the input voltage? 33% Part (c) What is the capacitance, in microfarads, of the capacitor...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed and terminal voltage and at an output power of 35kW. Neglecting losses in the motor, calculate the magnitude and phase angle of the line-to-neutral generated voltage Eaf and field current I if the motor is operating at (a) 0.9 power factor lagging (b) unity...
Question 2 --/2 Our big lecture-table solenoid has 560 turns, each with 60 mm diameter, spaced tightly to only be 160 mm Long (left-to-right). The standard power-supply only needs 10.2 Volt to push 6.0 A current thru the solenoid wire, clockwise as seen from the right When turning off the power supply, we adjust the current to zero in 125 millisec. * read this * → [a) show that the magnetic field in the solenoid space used to be 0.02639...
QUESTION 3 Our big lecture-table solenoid has 560 tums, each with 60 mm diameter, spaced tightly to only be 160 mm Long (left-to-right) The standard power supply needs 10.2 Volt to push 6.0 A current thru the solenoid wire, clockwise as seen from the night [a) show that the magnetic field in the solenoid space used to be 0.02639 T leftward (-x)] [b) what direction is the induced electric field, inside the solenoid cylinder : 1) before turnoff: 2) during...
onsider a DC electric motor. Assume the armature inductance is negligible. Consider the harmature voltage ea as the input and the angular displacement @t) as the ulput. By measuring an input and the system's response as functions of time, the transfer function is then found to be 10s(s +1) What are the motor time-constant and the motor gain? a. b. iIt the input is 2 u(l), find the output i.e. the angular displacement et) c. Find the angular speed o(t)
Problem #2 You have a 1000 W electric motor connected to a 200 Vms, 60 Hz source, and the resulting power factor is 0.8 lagging. (Hint: Based on the units, is power rating of the motor real power or apparent power?) a. What is the voltage in terms of a phasor? b. By how many degrees does the current lag the voltage? c. What is the RMS current drawn by the motor? d. What is the current in terms of...
QUESTION 2 Our big lecture-table solenoid has 560 turns, each with 60 mm diameter, spaced tightly to only be 160 mm Long (left-to-right) The standard power supply only needs 10 2 Volt to push 6.0 A current thru the solenoid wire, clockwise as seen from the right When turning off the power supply, we adjust the current to zero in 125 millisec * read this - (a) show that the magnetic field in the solenoid space used to be 0.02639...
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