Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 5, Problem 4RQ
A load impedance of 52 Ω is connected to the secondary winding of the transformer in question 3. How much current will flow in the secondary?
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Chapter 5 Solutions
Electrical Transformers and Rotating Machines
Ch. 5 - An AC power source is connected across 325 turns...Ch. 5 - Is the transformer in question 1 a step-up or...Ch. 5 - Prob. 3RQCh. 5 - A load impedance of 52 Ω is connected to the...Ch. 5 - How much current will flow in the primary of the...Ch. 5 - Prob. 6RQCh. 5 - A 480-volt three-phase load is rated at 34.5 kVA....Ch. 5 - If the load in question 7 was supplied by two...Ch. 5 - Prob. 1PCh. 5 - Prob. 2P
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- If a single-phase load is connected across the two line conductors and neutral of the transformer in question #2, and one line has a current of 80 amps and the other line has a current of 68 amps, how much current is flowing in the neutral conductor?arrow_forwardIf the secondary of the transformer in question 5 supplies a current of 9.6 amperes to a load, what is the primary current? (Disregard excitation current.)arrow_forwardAssume that a primary current of 75 amperes flows through the windings of the transformer in question 4. How much current will flow in the secondary winding?arrow_forward
- A current transformer has a ratio of 600:5. If three loops of wire are wound through the transformer core, how much primary current is required to produce 5 amperes of current in the secondary winding?arrow_forward1. Two compound generators are operated in parallel. If generator A has a series-field resistance of 0.0015 ohm and is adjusted to take 20 percent of the line load while generator B with a series field resistance of 0.001 ohm takes the remainder of the load. Determine the current flow in the two series fields and the equalizer when the load is 250 kw at 230 volts.arrow_forwardHow much current will flow in the primary of the transformer in question 4?arrow_forward
- A current transformer has 4 turns of wire in its primary winding. How many turns of wire are needed in the secondary winding to produce a current of 2 amperes when a current of 60 amperes flows in the primary winding?arrow_forwardWhen the DC machine is running under saturation condition, then flux per pole increases due to armature reaction. Select one: True Falsearrow_forward1 is the current flowing in the left mesh. 12 is the current flowing in the right mesh and 13 is the current flowing in the top mesh. If all three currents are flowing in the clockwise direction, find the value of 1, 12 and 13. 2A 2 ohm 1 ohm 12V 8V ЗАarrow_forward
- Question 2 Calculate the amount of DC current required for the magnetic circuit given below to generate a flux density of 1.0 T in the airgap. The details are Number of turns, N = 400 The core is made up of steel, the B-H characteristic has been given below The magnetic core length, le = 500 mm The airgap length, Ig = 2 mm The cross-sectional area of the core, Ag = 100 mm² Neglect leakage and fringing. Core Cross-sectional i(1) area as Air gap Magnetic path length Figure 1 2.0 1.8 B-H Curves for Various Metals Steel 1.6 1.4 Magnetic Saturation 1.2 1.0 0.8 Iron 근 0.4 Air 0.2 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Magnetic Field Strength - H (A/m) Figure 2 Flux Density - B (T)arrow_forwardThere is a total of 500 mA of current into five parallel resistors. The currents through four of the resistors are 50 mA, 150 mA, 25 mA, and 100 mA. What is the current through the fifth resistor?arrow_forwardDC and AC subject: 1. Consider a wire carrying a current in the presence of a magnetic field, and a given flux density of 0.25 T. If the wire is 1.0 m long and carries a 0.5 A current, what is the magnitude of the force induced in the wire? 2. The wire shown is moving in the presence of a magnetic field. With the information given in the figure, determine the magnitude and direction of the induced voltage in the wire. (see the figure below)arrow_forward
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