Welding: Principles and Applications (MindTap Course List)
Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 31, Problem 18R

Why must the pressure be bled off hoses when work is complete?

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(6) Determine the sizes of fuel orifice to give a 13.5 air fuel ratio, if the venture throat has 3 cm diameter and the pressure drop in the venture is 6.5 cm Hg. The air temperature and pressure at carburetor entrance are 1 bar and 27 °C respectively. The fuel orifice is at the same level as that of the float chamber. Take density of gasoline as (7 deg.) 740 kg/m³ and discharge coefficient as unity. Assume atmospheric pressure to be 76 cm of Hg. (7) A four-cylinder, four-stroke internal combustion engine has a bore of 87 mm. and a stroke of 77 mm. The clearance volume is 17% of the stroke volume and the engine with speed of 2700 rpm. The processes within each cylinder are modeled as an Otto cycle with a pressure of 1 atm and a temperature of 17 °C at the beginning (7 deg.) of compression. The maximum temperature in the cycle is 2717 °C (a) Draw the P-v diagram; label Pressures, Temperatures, Qin, and Qual (b) Calculate the mass of air at the beginning of the cycle (c) Calculate the…
University of Babylon College of Engineering\Al-Musayab Automobile Engineering Department Final Examination/1st Attempt جامعة بابل Subject: I. C. Engines I Maximum Time: 3 Hours Class: 3rd Date: / / 2023 Answer 07 of the following questions (First Semester) 2022/2023 (1) Choose the correct answer for eight only from below 1- Indicator diagram shows for one complete revolution of crank Maximum mark: 50 Deg. a) variation of kinetic heat in the cylinder. b) variation of pressure head in the cylinder c) variation of kinetic and pressure heat in the cylinder. d) none of the above. 2- A carburetor is used to supply (a) petrol, air and lubricating oil (b) air and diesel (e) petrol and lubricating oil (d) petrol and air. 3- In a four stroke cycle petrol engine, the charge is compressed when a) inlet valve is closed. b) exit valve is closed. c) both inlet and exit valves are closed. d) both inlet and exit valves are open. (8 deg.) 4- For an engine operating on air standard Otto cycle, the…
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Chapter 31 Solutions

Welding: Principles and Applications (MindTap Course List)

Ch. 31 - Why are combination welding and cutting torches...Ch. 31 - What is the advantage of using an injector-type...Ch. 31 - What should be done to the valve packing if the...Ch. 31 - What may happen to a tip seat if it is incorrectly...Ch. 31 - What can happen to a tip if it is excessively...Ch. 31 - What is the difference between a reverse flow...Ch. 31 - What are Siamese hoses?Ch. 31 - Why must the pressure be bled off hoses when work...Ch. 31 - What is the difference between a backfire and a...Ch. 31 - Why is a neutral flame the most commonly used...Ch. 31 - What properties should a good leak-detecting...Ch. 31 - Why must the oxygen cylinder valve be opened all...Ch. 31 - How long should hoses be purged?Ch. 31 - What should be done with cylinders that have...Ch. 31 - How should the spark lighter be held to light a...Ch. 31 - Once the torch is lit, why must the acetylene flow...Ch. 31 - What type of piping can be used for a manifold...Ch. 31 - What elements make up all hydrocarbons?Ch. 31 - What are the separate parts that make up an...Ch. 31 - Use Table 31-3 to determine which fuel gas...Ch. 31 - Approximately how long would it take a 50/50...Ch. 31 - Use Table 31-4 to determine which fuel gas has the...Ch. 31 - How is acetylene produced?Ch. 31 - Why is it not safe to use acetylene above 15 psig...Ch. 31 - Use Table 31-5 to determine the largest tip...Ch. 31 - Where is the highest temperature and where is the...Ch. 31 - Use Table 31-6 to determine what would be the...Ch. 31 - What are methylacetylene-propadiene fuel gases...Ch. 31 - Use Table 31-7 to determine which oxygen fuel-gas...Ch. 31 - Which fuel gas has the strongest odor and is...Ch. 31 - What is the major advantage of using propane or...Ch. 31 - Use Table 31-8 to determine which fuel gas would...Ch. 31 - What two major safety problems does hydrogen...Ch. 31 - Why should coat hangers not be used as gas welding...Ch. 31 - Explain the significance of the AWS filler metal...
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