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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Textbook Question
Chapter 8, Problem 41RQ
Find the common, start, and run terminals of the following hermetic compressors.
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Problem 5 (Optional, extra 6 points)
A 6-lb homogeneous disk of radius 3 in. spins as shown at the constant rate w₁ = 60 rad/s. The disk
is supported by the fork-ended rod AB, which is welded to the vertical shaft CBD. The system is
at rest when a couple Mo= (0.25ft-lb)j is applied to the shaft for 2 s and then removed. Determine
the dynamic reactions at C and D before and after the couple has been removed at 2 s.
4 in.
C
B
Mo
5 in
4 in.
Note: 2 rotating around CD induced by Mo is NOT
constant before Mo is removed.
and ₂ (two
unknowns) are related by the equation: ₂ =0+ w₂t
3 in.
Partial Answer (after Mo has been removed):
C-7.81+7.43k lb
D -7.81 7.43 lb
Problem 4.
A homogeneous disk with radius and mass m is mounted on an axle OG with length L and a
negligible mass. The axle is pivoted at the fixed-point O, and the disk is constrained to roll on a
horizontal surface. The disk rotates counterclockwise at the constant rate o₁ about the axle. (mg
must be included into your calculation)
(a). Calculate the linear velocity of G and indicate it on the figure.
(b). Calculate ₂ (constant), which is the angular velocity of the
axle OG around the vertical axis.
(c). Calculate the linear acceleration ā of G and indicate it on the
figure.
(d). Determine the force (assumed vertical) exerted by the floor on
the disk
(e). Determine the reaction at the pivot O.
1
Answers: N = mg +mr(r/L)² @² |j
mr w
IIG
C
R
L
i+
2L
=
Problem 2.
The homogeneous disk of weight W = 6 lb rotates at the constant rate co₁ = 16 rad/s with respect
to arm ABC, which is welded to a shaft DCE rotating at the constant rate 2 = 8 rad/s. Assume
the rod weight is negligible compared to the disk. Determine the dynamic reactions at D and E
(ignore mg).
Answers:
D=-7.12ĵ+4.47k lb
r-8 in.
9 in.
B
D
E=-1.822+4.47 lb
9 in.
E
12 in.
12 in.
x
Chapter 8 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 8 - What is magnetism?
Ch. 8 - How is an electromagnet produced?
Ch. 8 - Which of the following correctly lists the motor’s...Ch. 8 - Prob. 14RQCh. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Prob. 19RQCh. 8 - Prob. 20RQ
Ch. 8 - Prob. 21RQCh. 8 - What is the unit of measurement for the strength...Ch. 8 - Prob. 23RQCh. 8 - Prob. 24RQCh. 8 - List the five capacitor replacement rules.
Ch. 8 - Prob. 26RQCh. 8 - Prob. 27RQCh. 8 - What are the advantages and disadvantages of using...Ch. 8 - Prob. 29RQCh. 8 - Prob. 30RQCh. 8 - Prob. 31RQCh. 8 - True or False: All starting apparatuses are...Ch. 8 - Prob. 33RQCh. 8 - Which of the following is the capacitance of an...Ch. 8 - Which of the following is the capacitance of two...Ch. 8 - If a capacitor produces 15 ampere on a 240-volt...Ch. 8 - Which of the following capacitors could be used to...Ch. 8 - Which of the following capacitors could be used to...Ch. 8 - Which of the following capacitors or combination...Ch. 8 - Which of the following capacitors or combination...Ch. 8 - Find the common, start, and run terminals of the...Ch. 8 - Briefly explain the procedure for troubleshooting...Ch. 8 - What are the electrical failure categories for...Ch. 8 - What precautions should be taken when checking...Ch. 8 - True or False: The control module determines the...Ch. 8 - Explain the operation of the direct current motor...Ch. 8 - Prob. 47RQCh. 8 - Prob. 48RQCh. 8 - Explain the construction of an ECM.
Ch. 8 - An ECM is a __________.
three-phase, AC...Ch. 8 - True or False: The resistance readings of the...Ch. 8 - True or False: The line voltage power supply of an...
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