Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 13, Problem 1RQ
What is the device that consists of two unlike metal strips that are attached and have a different rate of expansion and contraction?
A. Thermistor
B. Thermocouple
C. Diaphragm
D. Bimetal
Expert Solution & Answer
To determine
The device that consists of two unlike metal strips that are attached and have a different rate of expansion and contraction.
Explanation of Solution
Bimetal is referred to an object which is comprised of two separate or different metals joined together with each other. It consists of different metal layers. A bimetal object is usually made up of iron and brass. Its working is based on the theory that a metal is contacted by the effect of cooling and expands by the effect of heating. The length of bimetal increases as there is an increase in the temperature. It consists of two different strips which are having unlike coefficient of thermal expansion.
A thermocouple is considered as an electrical device which constitutes of two different conductors forming junctions at different temperature.
A thermistor is a resistor whose resistivity is temperature dependent.
Thus, the device that consists of two unlike metal strips which are attached ad have a different rate of contraction and expansion is called as a bimetal.
Therefore, the correct option is (D).
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026
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042
66
[30]
11
10
1. Plot the moment (M), axial (N), and shear (S) diagrams as functions of z.
a)
b)
F₁ = 1250 N
F₁ = 600 N
M₁ = 350 000 N mm
F2 = 500 N
200 N
a = 600 mm
b=1000 mm
a=750 mm
b = 1000 mm
d)
M₁ = 350 000 N mm
F₁ = 600 N
F₂ =200 N
a = 600 mm
b = 1000 mm
M₁ 175 000 Nmm
F = 900 N
a-250 mm
b-1000 mm
-250 mm.
Figure 1: Schematics problem 1.
Given the following cross-sections (with units in mm):
b)
t=2
b=25
h=25
t = 1.5
b=20
b=25
t=2
I
t = 1.5
a=10
b=15
h-25
b=15
t=3
T
h=25
Figure 3: Cross-sections for problem 2.
1. For each of them, calculate the position of the centroid of area with respect to the given coordinate system
and report them in the table below.
2. For each of them, calculate the second moments of inertia I...
and I, around their respective centroid
of area and report them in the table below. Note: use the parallel axes theorem as much as possible to
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x
y
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lyy
by
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Chapter 13 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
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