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 2, Problem 22RQ
What is a conductor?
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Question F: Imagine that the diving board at your local swimming pool is made of cold drawn steel, and that we model it as a cantilever beam. We model the cyclic loading as a person jumping off the diving board for maximum load, and the diving board being at rest for minimum load. The parameters for the problem are shown in the table below. Use only this table for this question
Question P: A spur gear drive in a commercial enclosed gear unit has the input data shown in the table below. Use only this table for this question
Question Q: A spur gear drive in a commercial enclosed gear unit has the input data shown in the table below. Use only this table for this question! Other data can be obtained from the figures and tables from our textbook, also shown below. What is the bending stress number stp in the pinion in psi? (Type in an integer.
Chapter 2 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 2 - All physical objects are composed of __________....Ch. 2 - What is an atom?Ch. 2 - Which of the following is a part of the atom? a....Ch. 2 - What is static electricity?Ch. 2 - Name three ways electricity can be produced.Ch. 2 - What part do protons and electrons play in the...Ch. 2 - Which of the following is the simplest atom that...Ch. 2 - What are the four most important characteristics...Ch. 2 - What is electromotive force?Ch. 2 - Electromotive force is commonly measured in _____....
Ch. 2 - What is current?Ch. 2 - How is current measured? a. amperes b. ohms c....Ch. 2 - What is resistance?Ch. 2 - How is resistance commonly measured? a. amperes b....Ch. 2 - What is electrical power?Ch. 2 - How is electrical power commonly measured? a....Ch. 2 - Where do electrons exist in an atom, and what is...Ch. 2 - True or False: All atoms tend to lose electrons.Ch. 2 - State the law of electric charges.Ch. 2 - What is a proton? Where does it normally exist in...Ch. 2 - Describe briefly the method a dry cell battery...Ch. 2 - What is a conductor?Ch. 2 - Which of the following is the best conductor? a....Ch. 2 - What is an insulator?Ch. 2 - Which of the following is the best insulator? a....Ch. 2 - Why do metals make the best conductors?Ch. 2 - How do electric utility companies charge customers...Ch. 2 - What is the meaning of SEER when used in...Ch. 2 - State Ohms law.Ch. 2 - True or False: Ohms law applies to all types of...Ch. 2 - What is the ampere draw of a 5000-watt electric...Ch. 2 - What is the resistance of the heating element of...Ch. 2 - What is the voltage of a small electric heater if...Ch. 2 - What is the Btu/hour output of an electric heater...Ch. 2 - What is the kilowatt output of an electric heater...
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- Question 15 0 / 6 points Question O: A spur gear drive has the input data shown in the table below. Use only this table for this question. What is the tangential force on the pinion and gear in pounds? (Type in an integer.) Degrees per Radian = 57.296 degrees Pinion Torque: T= 250 Ibf-in Pinion speed: n₁ = 1150 rpm Pinion Number of teeth: Np = 20 Diametral pitch: Pd = 12 Answer: × (300)arrow_forwardQuestion 14 0 / 6 points Question N: A spur gear drive has the input data shown in in the table below. Use only this table for this question! What is the pitch line speed in ft/min? (Type in an integer.) Degrees per Radian = Pinion speed n p = 57.296 degrees 3540 rpm Pinion Number of teeth: Np = 20 Gear Number of teeth: NG= 50 Diametral pitch: Pd = 6arrow_forwardQuestion M: Use only the following information for this question. A bevel gear drive has the following attributes: The pinion has 20 teeth, the gear ratio is 3.250, the diametral pitch is 10, and the pressure angle is 20°. What is the pitch cone angle of the pinion in degrees? (Type in a one-decimal number.) Answer: x (17.1)arrow_forward
- Question L: A chain drive has information per the table below. Use only this table for this question! You will use Table 7-14 to select components for the chain drive. What is the length of the chain in inches that you should purchase for this application? (First, round up to an even number of pitches for the chain length. Then calculate the chain length in inches. (Type in an integer.) Chain pitch: p = 0.500 inches Roller chain size number = 40 Motor speed n₁ = 500 rpm Design power 3.50 hp Speed ratio: VR = 2.0 Nominal Center Distance: C = 24.00 inches TABLE 7-14 Horsepower Ratings-Single-Strand Roller Chain No. 40 No. of 0.500-in pitch Rotational Speed of small sprocket in rpm teeth 10 25 11 0.06 0.14 12 0.06 0.15 13 0.07 0.16 14 15 0.08 0.19 16 0.08 0.20 0.39 0.75 17 0.09 0.21 0.41 0.80 18 20 0.09 0.22 19 0.10 0.24 0.10 0.25 0.48 21 1.12 22 0.11 0.27 0.53 1.03 1.81 201 23 0.12 0.28 0.56 1.08 1.90 2.10 24 0.12 0.30 0.58 1.98 2.19 25 0.13 0.31 0.60 1.17 2.06 2.28 3.36 5.49 50 100 180…arrow_forwardQuestion K: A chain drive has information per the table below. Use only this table for this question! You will use Table 7-14 to select components for the chain drive. How many teeth are in the large sprocket? (Type in an integer.) Chain pitch: p= 0.500 inches Roller chain size number = 40 Motor speed n₁ = 500 rpm Design power = 3.50 hp Speed ratio: VR = 2.0 Nominal Center Distance: C = 24.00 inches No. of teeth TABLE 7-14 Horsepower Ratings-Single-Strand Roller Chain No. 40 0.500-in pitch Rotational Speed of small sprocket in rpm 10 25 50 100 180 200 300 500 700 900 1000 11 12 0.06 0.14 0.27 0.52 0.91 1.00 0.06 0.15 0.99 1.48 2.42 3.34 4.25 4.70 0.29 0.56 1.09 1.61 2.64 3.64 4.64 5.13 13 0.07 0.16 0.31 0.61 1.07 1.19 1.75 2.86 3.95 5.02 5.56 14 0.07 0.17 0.34 0.66 1.15 1.28 1.88 3.08 4.25 5.41 5.98 15 0.08 0.19 0.36 0.70 1.24 1.37 2.02 3.30 4.55 5.80 6.41 16 0.08 0.20 0.39 0.75 1.32 1.46 2.15 3.52 4.86 6.18 6.84 17 0.09 0.21 0.41 0.80 1.40 1.55 18 0.09 0.22 0.43 0.84 19 0.10 0.24 0.46…arrow_forwardQuestion D: Dimensions, material properties, and certain constants for a rod are shown in the table below. Use only this table for this question! Other data can be obtained from the figures and tables shown below. Input Data: Shaft material specification: Machined Steel Type of Stress: Reversed, repeated bending Tensile strength: s₁ = 825 MPa Reliability: 99.0% Material factor: C 0.80 Type of stress factor: Cst Shaft diameter: D= 1.00 Use 0.80 for cast steel Use 1.00 for bending stress 45 mm TABLE 5-3 Approximate Reliability Desired reliability Factors, CR CR 0.50 1.0 0.90 0.90 0.99 0.81 0.999 0.75arrow_forward
- Use only the following information for this question. The available V-belt sizes are given in Table 7-2 from the textbook as shown below. Your motor is running at 1160 rpm and your design power is 3 hp. Figure 7-13 is shown below to help you select a V-belt. The small V-belt pulley has a diameter of 8.00 inches, and the speed ratio between the driving and driven pulley is 1.50. Your machine needs a pulley center distance of roughly 26.0 inches. What is the maximum center distance in inches that you could use in this application, if the machine design warranted it? (Type in a one-decimal numberarrow_forwardDimensions, material properties, and certain constants for a rod are shown in the table below. Use only this table for this question! Other data can be obtained from the figures and tables shown belowarrow_forwardUse only the following information for this question. The available V-belt sizes are given in Table 7-2 from the textbook as shown below. Your motor is running at 1160 rpm and your design power is 3 hp. Figure 7-13 is shown below to assist you in selecting a V-belt. The small V-belt pulley has a diameter of 8.00 inches, and the speed ratio between the driving and driven pulleys is 1.40. Your machine needs a pulley center distance of roughly 24.0 inches. What is the belt length in inches that you should select from Table 7-2? (Type in an integer.) Note: Select a belt length from Table 7-2 that is closest to the one you calculated. Type in a number corresponding to the selected belt lengtharrow_forward
- Question G: Use only the following information for this question. A high-torque AC motor running a centrifugal pump is driving the small pulley of a V-Belt drive. The pump operates 10 hours per day. The motor is rotating at 3550 rpm, 70 lb-in torque, and the V-belt is moving at 3,800 feet/minute. The speed ratio between the driving and driven pulley is 1.80. Service Factors are shown in the table below. What is the design power of the system in horsepower? (Type in a two-decimal number) Note: To calculate the design power of the system, you need to use the service factor TABLE 7-1 V-Belt Service Factors' Driven machine type Smooth loading Agitators, light conveyors centrifugal pumps fans and blowers under 10 HP (7.5 kW) Driver type AC motors: Normal torque DC motors: Shunt-wound Engines: Multiple-cylinder AC motors: High torque³ DC motors: Series-wound, or compound-wound Engines: 4-cylinder or less 15h per day per day per day 15h per day 1.3 Light shock loading 1.1 1.2 1.3 1.2 1.3 1.4…arrow_forwardQuestion E: Imagine that the diving board at your local swimming pool is made of cold drawn steel, and that we model it as a cantilever beam. We model the cyclic loading as a person jumping off the diving boardarrow_forward: Use only the following information for this question. A bevel gear drive has the following attributes: The pinion has 20 teeth, the gear ratio is 3.250, the diametral pitch is 10, and the pressure angle is 20°. What is the pitch cone angle of the pinion in degrees? (Type in a one-decimal number.arrow_forward
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