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 2, Problem 35RQ
What is the kilowatt output of an electric heater that has an ampere draw of 50 amperes if the voltage source is (a) 208 volts? (b) 240 volts?
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Q4/ A compressor is driven motor by mean of a flat belt of thickness 10 mm and a width of
250 mm. The motor pulley is 300 mm diameter and run at 900 rpm and the compressor
pulley is 1500 mm diameter. The shaft center distance is 1.5 m. The angle of contact of
the smaller pulley is 220° and on the larger pulley is 270°. The coefficient of friction
between the belt and the small pulley is 0.3, and between the belt and the large pulley is
0.25. The maximum allowable belt stress is 2 MPa and the belt density is 970 kg/m³.
(a) What is the power capacity of the drive and (b) If the small pulley replaced by
V-grooved pulley of diameter 300 mm, grooved angle of 34° and the coefficient of
friction between belt and grooved pulley is 0.35. What will be the power capacity in this
case, assuming that the diameter of the large pulley remain the same of 1500 mm.
You are tasked with designing a power drive system to transmit power between a motor and a conveyor belt in a manufacturing facility as illustrated in figure.
The design must ensure efficient power transmission, reliability, and safety. Given the following specifications and constraints, design drive system for this application:
Specifications:
Motor Power: The electric motor provides 10 kW of power at 1,500 RPM.
Output Speed: The output shaft should rotate at 150 rpm.
Design Decisions:
Transmission ratio: Determine the necessary drive ratio for the system.
Shaft Diameter: Design the shafts for both the motor and the conveyor end.
Material Selection: Choose appropriate materials for the gears, shafts.
Bearings: Select suitable rolling element bearings.
Constraints:
Space Limitation:
The available space for the gear drive system is limited to a 1-meter-long section.
Attribute 4 of CEP
Depth of knowledge required
Fundamentals-based, first principles analytical approach…
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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