Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Chapter 1, Problem 8RQ
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25 mm
Brass core
E
=
105 GPa
0 = 20.9 x 10 °C
PROBLEM 2.49
The aluminum shell is fully bonded to the brass core and the
assembly is unstressed at a temperature of 15°C. Considering only
axial deformations, determine the stress in the aluminum when the
temperature reaches 195°C.
60 mm
Aluminum shell
E = 70 GPa
a = 23.6 × 10°C
This is an old practice exam. The answers are OAB = 19.10 ksi OBC = 2.228 ksi OCD = −2.865 ksi v = 0.2792delta Ltot = 0.01585 in (increase) but why
A random poly(styrene-butadiene) copoly-
mer has a number-average molecular weight of
350,000 g/mol and a degree of polymerization of
5000. Compute the fraction of styrene and buta-
diene repeat units in this copolymer.
H H
| |
-C-C-
방
H
Chapter 1 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 1 - True or False: A heating and air-conditioning...Ch. 1 - What is a live electrical circuit?Ch. 1 - Which of the following voltages will a...Ch. 1 - Electrical shock occurs when a person _________....Ch. 1 - What are the important elements of electrical...Ch. 1 - Prob. 6RQCh. 1 - Which of the following is the standard by which...Ch. 1 - Prob. 8RQCh. 1 - What type of ladder should the technician use on...Ch. 1 - What precautions should be taken when you see a...
Ch. 1 - True or False: It is recommended that at least one...Ch. 1 - True or False: The correct fuse size for an...Ch. 1 - What is the difference between a two-prong plug...Ch. 1 - Which prong on a three-prong plug is the ground?...Ch. 1 - True or False: A grounding adapter does no good if...Ch. 1 - An electrical device that will open an electrical...Ch. 1 - True or False: Receptacles used on the job site...Ch. 1 - What precautions should you use when working in an...Ch. 1 - What is the difference between a fuse and a...Ch. 1 - List at least five electrical safety rules that...
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- Design and assemble on the fluidsim (or a draft) the Hydraulic Drive Circuit, with the following characteristics: (a) Sequential operation, pressure, for the advance and return of the cylinders (according to the proper operation for the device) controlled by a directional 4x3 way, closed center; (b) Speed control for the cylinders, according to the load signal; (c) Pressure counterbalance for cylinder A, in order to compensate for the weight of the assembly.arrow_forwardThis is an old exam practice question. The answer is Pmax = 218.8 kN normal stress governs but why?arrow_forwardMoist air initially at T₁ = 140°C, p₁ = 4 bar, and p₁ = 50% is contained in a 2.0-m³ closed, rigid tank. The tank contents are cooled to T₂ 35°C. Step 1 Determine the temperature at which condensation begins, in °C.arrow_forward
- Air at T₁ = 24°C, p₁ = 1 bar, 50% relative humidity enters an insulated chamber operating at steady state with a mass flow rate of 3 kg/min and mixes with a saturated moist air stream entering at T2=7°C, p₂ = 1 bar. A single mixed stream exits at T3-17°C, p3=1 bar. Neglect kinetic and potential energy effectsarrow_forwardHand calculation of cooling loadarrow_forwardAn HEV has a 24kW battery. How many miles can it go on electricity alone at 40 mph on a flat straight road with no headwind? Assume the rolling resistance factor is 0.018 and the Coefficient of Drag (aerodynamic) is 0.29 the frontal area is 2.25m^2 and the vehicle weighs 1618 kg.arrow_forward
- As shown in the figure below, moist air at T₁ = 36°C, 1 bar, and 35% relative humidity enters a heat exchanger operating at steady state with a volumetric flow rate of 10 m³/min and is cooled at constant pressure to 22°C. Ignoring kinetic and potential energy effects, determine: (a) the dew point temperature at the inlet, in °C. (b) the mass flow rate of moist air at the exit, in kg/min. (c) the relative humidity at the exit. (d) the rate of heat transfer from the moist air stream, in kW. (AV)1, T1 P₁ = 1 bar 11 = 35% 120 T₂=22°C P2 = 1 bararrow_forwardThe inside temperature of a wall in a dwelling is 19°C. If the air in the room is at 21°C, what is the maximum relative humidity, in percent, the air can have before condensation occurs on the wall?arrow_forwardThe inside temperature of a wall in a dwelling is 19°C. If the air in the room is at 21°C, what is the maximum relative humidity, in percent, the air can have before condensation occurs on the wall?arrow_forward
- ###arrow_forwardFind the closed loop transfer function and then plot the step response for diFerentvalues of K in MATLAB. Show step response plot for different values of K. Auto Controls Show solution for transform function and provide matlab code (use k(i) for for loop NO COPIED SOLUTIONSarrow_forwardThis is an old practice exam. The answer is Ta-a = 4.615 MPa max = 14.20 MPa Su = 31.24 MPa Sus = 10.15 MPa but why?arrow_forward
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