Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 3RQ
A wye-connected load has a voltage of 480 V applied to it. What is the voltage dropped across each phase?
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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)
What is the peak voltage of a 120V RMS AC voltage?
From the experiment 2, the two wattmeter
method is used to measure the power. In that
pressure coil is series with the load and
current coil is parallel with the load as
connected.
Select one:
True
O False
Chapter 7 Solutions
Electrical Transformers and Rotating Machines
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - A wye-connected load has a voltage of 480 V...Ch. 7 - A wye-connected load has a phase current of 25 A....Ch. 7 - Prob. 5RQCh. 7 - A delta connection has 30 A of current flowing...Ch. 7 - A three-phase load has a phase voltage of 240 V...Ch. 7 - If the load in question 7 is connected in a wye,...Ch. 7 - An alternator with a line voltage of 2400 V...Ch. 7 - Prob. 10RQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Name three factors that determine the amount of induced voltage.arrow_forwardA 480-volt three-phase load is rated at 34.5 kVA. It is to be supplied with variable three-phase voltage. Because the load is continuous, the transformers ratings are to be increased by 1.25% of the rated load. Three variable autotransformers are used to supply this load. Refer to Table 4-2 and determine the standard size of each transformer that should be used to make this connection.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_forward
- How many lines of magnetic flux must be cut in 1 s to induce a voltage of 1 V?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_forwardwhat is the smallest gage size copper wire that will limit the conductor voltage drop to 5v when 120 vac is supplied to a 6-A loadarrow_forward
- In the experiment No.1, the power measurement using two wattmeter method for star connected load, the value of phase current and line current is not equal. Select one: True Falsearrow_forwardName three factors that cause the magnetic field to rotate.arrow_forwardFind the value of the currents I1 and 12. 100 ohm 5V 5V 100 ohm 12 O a. 1=-0.3A, 12=-0.1A O b. 11=0.3A, 12=0.1A Oc. 11=0.05A, 12=0.1A O d. 11=0.1A, 12=0.2Aarrow_forward
- Related Problem The transistor in Figure 4-19 has the following maximum ratings: PpDomax) = 500 mW, VCEmax) = 25 V, and Icimax) = 200 mA. Determine the maximum value to which Vcc can be adjusted without exceeding a rating. Which rating would be exceeded first?arrow_forward16. The following resistors are connected in parallel: 1.0 ΜΩ, 2.2 ΜΩ, 5.6 ΜΩ, 12. and 22 M. Determine the to- tal resistance.arrow_forwardis used to convert resistance value into voltage value.arrow_forward
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