EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Textbook Question
Chapter 7, Problem 6R
Plans require the installation of surface-mounted fluorescent luminaires on the ceiling of a recreation room that is finished with low-density ceiling fiberboard. What sort of mark would you look for on the label of the luminaire? ________________________________________
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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.
Crystallographic positions
Crystallographic position
is denoted by three
numbers, which are
coefficients of the
position vector, e.g. ½½½
for the red atom.
Here the 'new' atom is at a/2 + b/2 + c/2
Silicon crystal has so-called "diamond type lattice".
Each Si atom has 4 nearest neighbors.
Diamond lattice starts with a FCC lattice and then
adds four additional INTERNAL atoms at locations
r = a/4+b/4+c/4 away from each of the atoms. In
other words, diamond lattice is formed by two FCC
lattices sifted by the vector r.
find the answers for this prelab
Chapter 7 Solutions
EBK ELECTRICAL WIRING RESIDENTIAL
Ch. 7 - Is it permissible to install a recessed luminaire...Ch. 7 - If a recessed luminaire without an integral...Ch. 7 - Thermal insulation is not permitted to be...Ch. 7 - Recessed luminaires are available for installation...Ch. 7 - Unless specifically designed, all recessed...Ch. 7 - Plans require the installation of surface-mounted...Ch. 7 - A recessed luminaire bears no marking indicating...Ch. 7 - Prob. 8RCh. 7 - Additional backup protection for ballasts can be...Ch. 7 - Prob. 10R
Ch. 7 - The Code places a maximum open-circuit voltage on...Ch. 7 - The letter E in a circle on a ballast nameplate...Ch. 7 - A 120-volt lamp fluorescent ballast for two...Ch. 7 - Can an incandescent lamp dimmer be used to control...Ch. 7 - A good rule-of-thumb to estimate the expected life...Ch. 7 - A post light has a 120-volt, 60-watt lamp...Ch. 7 - Define the following terms. a. A tap conductor is...Ch. 7 - Circle the correct answer for the following...Ch. 7 - Circle the correct answer for the following...
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