Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 3, Problem 9RQ
To determine
The current in the circuit.
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Determine the total resistance and the current flow for the circuit shown in the accompanying figure?
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)
In the following parallel circuit, what is the equivalent resistance and the total current in the circuit?
Chapter 3 Solutions
Electrical Transformers and Rotating Machines
Ch. 3 - How many degrees are the current and voltage out...Ch. 3 - How many degrees are the current and voltage out...Ch. 3 - To what is inductive reactance proportional?Ch. 3 - Four inductors, each having an inductance of 0.6...Ch. 3 - Three inductors are connected in parallel....Ch. 3 - Prob. 6RQCh. 3 - An inductor is connected to a 240-V, 1000-Hz line....Ch. 3 - Prob. 8RQCh. 3 - Prob. 9RQCh. 3 - An inductor has an inductive reactance of 250 Ω...
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- How many lines of magnetic flux must be cut in 1 s to induce a voltage of 1 V?arrow_forwardHow much current will flow in the primary of the transformer in question 4?arrow_forwardFour inductors, each having an inductance of 0.6 H, are connected in series. What is the total inductance of the circuit?arrow_forward
- Three inductors are connected in parallel. Inductor 1 has an inductance of 0.06 H; inductor 2 has an inductance of 0.05 H; and inductor 3 has an inductance of 0.1 H. What is the total inductance of this circuit?arrow_forwardFollowing the procedure discussed in Chapter 7, place wire numbers on the schematic in Figure 8–7. Place corresponding wire numbers on the components shown in Figure 8–8.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
- There 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_forwardIf the load in question 7 is connected in a wye, what would be the line voltage and line current supplying the load?arrow_forwardIf 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_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_forwardWhat is the total current from the voltage source in Figure 6-64 for each switch position? Figure 6-64 15 V + +₁₁ +₁ R₁ 1.0 ΚΩ +₁ R₂ 1.8 ΚΩ www +₁₁ R3 2.2 ΚΩ www R4 2.7 ΚΩarrow_forwardPLEASE ANSWER #4 ONLY. USE THIS ID# AS A BASIS A=4 B=8 C=4 D=7 E=2 F=2arrow_forward
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