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
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 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...
A 230 V, 1000 rpm, 30 A separately excited motor has armature resistance and inductance of 0.7 Ω and 50 mH respectively. Motor is controlled in regenerative braking by a chopper operating at 800 Hz from a dc source of 230 V. Assuming continuous conduction a) Calculate duty ratio of chopper for rated torque and the speed of 800 rpm. b) What will be the motor speed for duty ratio of 0.6 and rated motor torque? c) What will be...
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...
An electric motor with a resistance of 15Ω and an inductance of 53 mH is connected to a 60.0 Hz ac generator. Part A: What is the power factor for this circuit? Express your answer using two significant figures. Part B: In order to increase the power factor of this circuit to 0.80, a capacitor is connected in series with the motor and inductor. Find the required value of the capacitance. Express your answers using two significant figures. Enter your...
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)
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...
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...
I just need answers to f,g,and h connected motor is connected to Vi-L 120 3T/6 V-rms, 50 Hz three e resistance and inductance of each phase is 8-Ω and 0.04 H, respectively. The PS. A three-phase phase source. The wire between a source and the motor has 0.1-Ω of resistance and 1 mH inductance. nd the phase voltage. (2 pts.) a single-phase diagram of the system with its values. (5 pts.) c) Find the line current (magnitude and phase) for...