EBK MINDTAP FOR HERMAN'S DELMAR'S STAND
7th Edition
ISBN: 9781337900614
Author: Herman
Publisher: VST
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Chapter 27, Problem 2PA
You have been given a transformer to install on a 277-V line. The transformer nameplate is shown in Figure 27-69. The transformer must supply a 120-V, 20-A circuit. The transformer capacity should be not less than 115% of the rated load. Does the transformer you have been given have enough kVA capacity to supply the load? To which transformer terminals would you connect the incoming power? To which transformer terminals would you connect the load?
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Finding crystallographic direction
Z
pt. 2
head
pt. 1:
៩
Example 2:
pt. 1 x₁ = a, y₁ = b/2, z₁ = 0
pt. 2 x2=-a, y₂ = b,
Z₂ = c
-a-a b-b/2
c-0
a
b c
tail
=> -2, 1/2, 1
Multiplying by 2 to eliminate the fraction
-4,1,2 => [412] where the overbar represents a
negative index
families of directions
Crystallographic planes
Crystallographic planes are denoted by Miller indices.
5b
Algorithm for Miller indices
1. Read off intercepts of plane with axes in
terms of a, b, c
2. Take reciprocals of intercepts
3. Reduce to smallest integer values
4. Enclose in parentheses, no commas.
353
1/3 1/5 1/3
535
(535)
In the cubic system, a plane and a
direction with the same indices are
orthogonal. E.g. [100] direction is
perpendicular to (100) plane.
Correspondingly, [123] direction is
perpendicular to (123) plane.
[2,3,3]
Plane intercepts axes at 3a, 2b, 2c
2
11 1
Reciprocal numbers are:
3'2'2
b.
Indices of the plane (Miller): (2,3,3)
2
a
Indices of the direction: [2,3,3]
X
(200)
(100)
(110)
(111)
(100)
Indices of crystallographic plane can be found from cross product of indices of
any two non-parallel directions in this plane.
Chapter 27 Solutions
EBK MINDTAP FOR HERMAN'S DELMAR'S STAND
Ch. 27 - What is a transformer?Ch. 27 - What are common efficiencies for transformers?Ch. 27 - What is an isolation transformer?Ch. 27 - All values of a transformer are proportional to...Ch. 27 - What is an autotransformer?Ch. 27 - What is a disadvantage of an autotransformer?Ch. 27 - Explain the difference between a step-up and a...Ch. 27 - A transformer has a primary voltage of 240 V and a...Ch. 27 - A transformer has an output of 750 VA. The primary...Ch. 27 - A transformer has a turns ratio of 1:6. The...
Ch. 27 - What do the dots shown beside the terminal leads...Ch. 27 - A transformer has a primary voltage rating of 240...Ch. 27 - If the windings of the transformer in Question 12...Ch. 27 - The primary leads of a transformer are labeled 1...Ch. 27 - You are working in an industrial plant. You must...Ch. 27 - You have been given a transformer to install on a...Ch. 27 - EP120VIPNP300TurnsRatioEs24IsNsZ=3Ch. 27 - EP240VIPNPRatioEs320VIsNs280Z=500Ch. 27 - EPIPNPRatio1:2.5Es160VIsNs80TurnsZ=12Ch. 27 - Prob. 4PPCh. 27 - Prob. 5PPCh. 27 - ES480VIPNS275turnsRatioESISNS525turnsZ=1.2kCh. 27 - ...Ch. 27 - ...
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