Consider the 8-kV: 78-kV, 50-MVA transformer of Problem 2.15 connected as an autotransformer. a. Determine the voltage

Question:

Consider the 8-kV: 78-kV, 50-MVA transformer of Problem 2.15 connected as an autotransformer.

a. Determine the voltage ratings of the high- and low-voltage windings for this connection and the kVA rating of the autotransformer connection.

b. Calculate the efficiency of the transformer in this connection when it is supplying its rated load at unity power factor.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For book-img-for-question

Electric Machinery

ISBN: 978-0071230100

6th Edition

Authors: Charles Kingsley, Jr, Stephen D. Umans

See More Books

Question Posted: Feb 12, 2011 02:28 AM

See More Questions

At the point in its orbit when it is closest to the Sun, Halleys Comet moves with a speed of 54,500 m/s (Figure 3.48). When it is at its most distant point, the separation between it and the Sun is...
Triphenylmethanol is insoluble in water, but when it is treated with concentrated sulfuric acid, a bright yellow solution results. As this yellow solution is diluted with water, its color disappears...
The primary windings of a transformer which has 88% efficiency are connected to 110-V ac. The secondary windings are connected across a 2.4-, 75-W light bulb. (a) Calculate the current through the...
Select the best response. What trend can be related to a major employer closing a business? Property values falling and people moving from a community. A rise in slips, trips and falls. New...
Kennedy Middle School is going to select a committee. The committee will have a faculty member, a male student, a female student, a parent, and a school board member. Here are the positions and the...
Name and compare temperate and tropical estuaries. What types of plants are characteristic of each?
Two heat exchangers are being considered for installation in a chemical plant. It is projected that: For an effective interest rate of $10 \%$, determine the uniform end-of-year maintenance for...
The Park Plaza Hotel awarded its valet and laundry concession to Larson for a three-year term. The contract contained the following provision: It is distinctly understood and agreed that the services...
700 The demand function for a widget is given by p = 80+ where p is the price of the widget in dollars and x is the number of items in thousands of In x items and x > 1. Find the marginal revenue...
This problem is based on the JA Tires data that was first introduced in problem 6-35. If you have not already accessed the data, it can be downloaded from the textbook website. As part of risk...
A 120: 480-V, 10-kVA transformer is to be used as an autotransformer to supply a 480-V circuit from a 600-V source. When it is tested as a two-winding transformer at rated load, unity power factor,...
The high-voltage terminals of a three-phase bank of three single-phase transformers are supplied from a three-wire, three-phase 13.8-kV (line-to-line) system. The low-voltage terminals are to be...
Show that the Reynolds number for flow in a circular pipe of diameter D can be expressed as Re = 4m/(D).
A company determined the number of weeks vacation its employees use during the course of a year is normally distributed. The mean amount of time is 13 days with a standard deviation of 5 days. What...
A building is acquired with 14,000 shares of $10.00 par value common stock. The market value at the time of acquisition is $103.00 per share The fair market value of the building is $750,000.00. When...
1. PunchTab has 1,000,000 shares of common stock in a seed round. They raise $750,000 in a convertible note from an angel investor in the seed round. Conversion is triggered if there is a priced...
On April 1, 2018, an F-22 Raptor (asset) with an estimated life of 5 years and an estimated salvage value of $27M was acquired. The asset had a cash price of $171M. The fiscal year-end is December...
. Several times each week, Peter works out at a local health club, but because he is not a member, he pays a price of $10 each time he shows up to use the club facilities. The table shows Peter's...
Implement the transfer function below using the fast convolution structure of Figure 8.27 with the subfilters of length one: \[H(z)=0.25+0.5 z^{-1}-0.5 z^{-2}-0.25 z^{-3} .\] x(n) 12 C(z) 100 Co(2) +...
Explain why it is not wise to accept a null hypothesis.
According to Coulombs law, if the separation between two particles of the same charge is doubled, what happens to the potential energy of the two particles? a) It is twice as high as it was before...
A hydraulically operated multidisk plate clutch has an effective disk outer diameter of 6.5 in and an inner diameter of 4 in. The coefficient of friction is 0.24, and the limiting pressure is 120...
Look again at Prob. 1617. (a) Show how the optimal diameter d is related to the outside diameter D. (b) What is the optimal inner diameter? (c) What does the tabulation show about maxima? (d) Common...
A cone clutch has D = 330 mm, d = 306 mm, a cone length of 60 mm, and a coefficient of friction of 0.26. A torque of 200 N ?m is to be transmitted. For this requirement, estimate the actuating force...
What is the worst case running time of the following sudo codes, in 0- notation? Suppose that all arithmetic operations (including simple multiplication) take a constant amount of time. Justify your...
4. Let G be a pseudorandom generator with expansion factor (n) > 2n. In each of the following cases, say whether G' is necessarily a pseudorandom generator and explain why or why not. Here, "||...
Write the code for the del () method in the following doubly linked list class public class ObjDList { private Obj Node list; private Obj Node tail; public ObjDList() { list = null; tail = null; }...

Consider the 8-kV: 78-kV, 50-MVA transformer of Problem 2.15 connected as an autotransformer. a. Determine the voltage

Question:

Step by Step Answer:

part a The voltage rating is 78 kV86 kV The rated current of the high ...View the full answer

Electric Machinery

Students also viewed these Electrical Engineering questions