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31 Cards in this Set
- Front
- Back
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T/F the term "fluid power" includes hydraulics and pneumatics, and is power that is applied through liquids or gases pumped or compressed to provide force and motion to mechanisms
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True
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The purpose of your textbook, Fluid Power, is to provide you with what?
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a basic reference concerning fundamentals of fluid power
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What are favorable characteristics of a fluid power system?
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very large forces can be controlled by much smaller ones, different parts of the system can be located at widely separated points, and motion can be transmitted without the slack inherent in the use of solid machine parts
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What type of system requires a medium amount of pressure and fairly accurate control?
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pneumatic
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What type of system requires a medium amount of pressure and more accurate control?
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Combination hydraulic and pneumatic
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What type of system requires a great amount of pressure and/or extremely accurate control?
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hydraulic
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What are some special problems of fluid power systems
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loss in efficiency as the force of the fluid is conveyed up and down or around corners, loss of force as the fluid is transmitted over considerable distances, leaks
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originally confined to the study
of the physical behavior of water at rest and in motion. The term “hydraulics” now includes the physical behavior of all 1. liquids 2. gases 3. liquids and gases 4. liquids, gases, and solids |
liquids
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Pascal’s law pertains to the
1. construction of aqueducts 2. use of water wheels for doing work 3. differences of floating and submerged bodies 4. transmission of force in confined fluids |
transmission of force in confined fluids
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What type of power is used in a dental chair
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hydraulic
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What type of power is used in an anchor windlass?
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hydraulic
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What type of power is used in a service station lift?
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hydro-pneumatic
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T/F all matter is classified according to its state as a solid, liquid, or a gas?
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true
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What are the critical factors affecting the state of matter?
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pressure and temperature?
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T/F Pressure can be measured in terms of force per unit area?
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true
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Which of the following statements are true?
A. The troposphere is that part of the atmosphere touching the earth’s surface B. The atmosphere has weight. c. Atmospheric pressure decreases as altitude decreases. D. Atmospheric pressure at points below sea level is less than at sea level |
A and B
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The reference standard used as an indicator of atmospheric pressure is a column of mercury that at sea level is?
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76 centimeters high at 0 C
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The side of a thin-walled chamber partially evacuated of air is the source of movement for what?
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aneroid barometer
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In the metric system the density of a substance is its weight in?
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grams per cubic centimeter
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What change, if any, will occur in the volume and weight of a substance if its temperature changes?
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Its volume will change, but its weight will remain constant
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Which statement about specific
gravity is false? 1. The density of a solid can be determined by multiplying its specific gravity times the density of water 2. Specific gravity can also be described as specific weight or specific density 3. Specific gravity of a substance should be measured at a standardized temperature and pressure 4. Specific gravity will vary with the size of the sample being tested |
Specific gravity will vary with the size of the sample being tested
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How can the specific gravity of a liquid or solid be expressed?
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as a ratio between the weight of the substance and the weight of an equal volume of water, or as the number that shows the density of the substance in the metric system
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What is the specific gravity of a liquid which weighs 44 punds per cubic foot at 4 degrees C
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0.705
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What is the density of a solid that has a specific gravity of 2.5
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156 pounds per cubic foot
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What is the specific gravity of a solid object which weighs 49.92 pounds per cubic foot?
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0.8
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A device used for measuring the specific gravity of a liquid is known as a?
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hydrometer
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T/F The pressure of force exerted on the end of a rigid metal bar is applied equally and undiminished to all surfaces of the bar?
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False
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The head, or pressure due to the weight of a fluid, depends on the density of the fluid and the?
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area of the bottom surface of the container
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Assume that the input piston has an area of 3 square inches with a force of 45 pounds. What is the pressure in the system?
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15psi
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Assume that the output piston has a diameter of 6 inches and is subject to a pressure of 10 pounds per square inch. What is the force exerted on the output piston?
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282.6 pounds
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For two pistons in the same fluid power system, the distances moved are inversely proportional to the?
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areas of the pistons
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