A simple rotating loop between two curved pole faces connected to a battery and a resistor through a switch has the following characteristics : Radius of the loop, r = 8 m, length of the loop, l = 1 m, Resistance = 0.38 ohm, flux density B = 0.22 T and Voltage at the terminals of the loop. Vr = 126 V. What would be the strarting current in the loop if the switch is initially closed? Question 4 Answer a. 0 A b. 2652.63 A c. 331.58 A d. 331.58 A

A simple rotating loop between two curved pole faces connected to a battery and a resistor through a switch has the following characteristics : Radius of the loop, r = 8 m, length of the loop, l = 1 m, Resistance = 0.38 ohm, flux density B = 0.22 T and Voltage at the terminals of the loop. Vr = 126 V. What would be the strarting current in the loop if the switch is initially closed? Question 4 Answer a. 0 A b. 2652.63 A c. 331.58 A d. 331.58 A

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.7MCQ: Consider Figure 3.5. Match the following, those on the left to those on the right. (i) Im (a)...

See similar textbooks

Similar questions

Look carefully at the figure and answer the following questions. For your answers choose between on the right, on the left and it is zero; there are no more options. Clearly explain your answers. A) When the switch is closed i. Where does the current flow in the battery? ii. Where is the magnetic flux going in the bar on the left? iii. Where is the magnetic flux going in the bar on the right? iv. Towards where the current flows in the resistor?
How can the polarity of an electromagnet be determined if the direction of current flow is known? 2. Define the following terms: 3. flux density 4. Permeability 5. Reluctance 6. Saturation Unit 13 Magnetic Induction 7. Name three factors that determine the amount of induced voltage in a coil. 8. What is the effect on induced voltage of adding more turns of wire to a coil? 9. Into how many time constants is an exponential curve divided? 10. Each time constant of an exponential curve is equal to what percentage of the maximum amount of charge? 11. An inductor has an inductance of 0.025 H and a wire resistance of 3 . How long will it take the current to reach its full Ohm's law value? Unit 15 Alternating Current . 12 What is the most common type of AC waveform? 13 How many degrees are there in one complete sine wave? 14 At what angle does the voltage reach its maximum negative value on a sine wave? 15 A sine wave…
An iron circuit with a small 0.75 mm air gap is shown in Figure 1. A 6000 turn coil carries a current 1 = 18 mA which sets up a flux within the iron and across the air gap. The cross section of the iron is a consistent 0.8 cm², and the mean length of the flux path is 0.15 m. a) Redraw the magnetic circuit using schematic symbols of an electric circuit with reluctance in each part of the circuit. b) State's Ohm's Law for magnetic circuit. c) By neglecting the effect of fringing, calculate the reluctance of the circuit. d) Find the flux within the core. N = 6000 Iron circuit (t, = 800 for iron).
A current in a 250 turn coil is 2.25A, wound in a core that has a reluctance of 12,000 AT/Wb. What is the resulting flux density (in Tesla), if the area of the core is 8cm²?
An iron circuit with a small 0.75 mm air gap is shown in Figure 1. A 6000 turn coil carries a current I = 18 mA which sets up a flux within the iron and across the air gap. The cross section of the iron is a consistent 0.8 cm², and the mean length of the flux path is 0.15 m. a) Redraw the magnetic circuit using schematic symbols of an electric circuit with reluctance in each part of the circuit. b) State's Ohm's Law for magnetic circuit. c) By neglecting the effect of fringing, calculate the reluctance of the circuit. d) Find the flux within the core. N = 6000 Iron circuit (ur = 800 for iron).
Please answer a, b, c and d
Question 3 A two-legged core is shown in Figure 3. The winding on the left leg of the core has N1 = 400 turns, and the winding on the right has N2 = 300 turns. The coils are wound in the directions shown in the figure. If the dimensions are as shown, then what flux would be produced by currents i = 0.5 A and iz = 0.75 A? Assume ur = 1000 and constant. 15 em- +15 em 50 em 15 cm 50 em 400 turms 300 turns N2 15 cm Core depth = 15 em Figure 3
1.Consider the magnetic core below.All dimensions are shown on the figure. The core is made up of legs with 2 different cross-sectional areas.The depth of core is 10cm.The relative permeability of the core is 2000. The current in the magnetising coil is 1 A. The number of turns of the coil is 2000.Calculate: (i)the reluctances and draw the magnetic circuit (ii)the flux in the core (iii)Flux densities B and field intensities H in legs having different cross-sectional areas. (iv)Verify Ampere's Law. Depth: 10 cm I=1A 20cm 2000 Turns 65cm 15cm 15cm 50cm 15cm ndo un of
Question 1 A ferromagnetic core is shown in Figure 1. The depth of the core is 5 cm. The other dimensions of the core are as shown in the figure. a) Find the value of the current that will produce a flux of 0.005 Wb. b) With this current, what is the flux density at the top of the core? c) What is the flux density at the right side of the core? Assume that the relative permeability of the core is 1000. cm -10 cm-- 20 cm 15 cm 500 turns 15 cm 15 cm Core depth 5 cm Figure 1
A simple magnetic circuit is shown in Figure 1. The turn ratio is 250 turns and the current is 3.2 A. 15 cm 25 cm 25 cm N Figure 1: System for Q1 2 cm a) Draw the equivalent electric circuit and find the reluctance of each section. b) Find the total flux at the middle section of the circuit (where the winding is). c) Find the flux density at the right leg of the core
how much flux
A solenoid is 1 Cm long with a diameter of 0.5 Cm. The core is SiFe with a relative permeability of 4200. Assuming a current of 100 mA, what is the maximum number of turns for the winding that keeps the core under the saturation magnetic field of about 1.5 Tesla?