MET230_Wk1_Practice_Hribar_Carly

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ECPI University, Virginia Beach *

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230

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Mechanical Engineering

Date

Feb 20, 2024

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docx

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2

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Chapter 1 1. What is the difference between the terms fluid power and hydraulics and pneumatics? The difference between the terms fluid power and hydraulics and pneumatics is the difference in the amount of fluid used and also the amount of pressure that is built in the process. With fluid power it is using a large amount of fluid while gaining very little pressure. Hydraulics and pneumatics have less fluid, and a system that produces more working pressure. 2. Name the six basic components required in a hydraulic circuit. - Reservoir - Pump - Motor or power source - Valves to control oil direction pressure and flow rate - Piping, to carry oil from one location to another Chapter 2 1. What are the four primary functions of a hydraulic fluid? - To transmit power - To lubricate parts - Seal clearances between mating parts - Dissipate heat 2. Name two advantages and two disadvantages that air has in comparison to oil when used in a fluid power system. - Advantages: It is fire resistant, and it is not messy. - Disadvantages: Because it is compressible it air tends to be sluggish, and a lubricant must be added to air to lubricate valves and actuators. 3. Differentiate between gage and absolute pressures. - Gage Pressure-measured relative to the atmosphere whereas absolute pressure are measured relative to a perfect vacuum. Chapter 5 1. What is a positive displacement pump? In what ways does it differ from a centrifugal pump? - It is a pump that ejects a fixed amount of fluid per revolution. What makes the different than a centrifugal pump is that a positive displacement pump must be protected against overpressure. 2. What is pump cavitation and what causes it? - It is a noise problem that can occur due to air bubbles being in the hydraulic fluid. 3. Why are centrifugal pumps so little used in fluid power systems? - The are use so little due to the lack of pressure compared to other pumps. 4. Name four rules that will control or eliminate cavitation of a pump. - Keep suction line celocities below 4ft/s
- Keep pump inlet lines as short as possible - Minimize the number of fittings in the inlet line - Mount the pump as close to the reservoir as possible Chapter 6 1. Why does the rod of a double-acting cylinder retract at a greater velocity than it extends for the same input flow rate? - Because the fluid enters at a slower rate on retraction.
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