ELE 293 Hydraulics and Pneumatics-QUESTIONS WITH VERIFIED ANSWERS

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Define the term fluid power. o Fluid power: technology that deals with the generation, control, and transmission of power, using pressurized fluids.  Why is hydraulic power especially useful whe... n performing heavy work? o Liquids provide a very rigid medium for transmitting power and thus can operate under high pressures to provide huge forces and torques to drive loads with utmost accuracy and precision.  What is the difference between the terms fluid power and hydraulics and pneumatics? o Fluid power: generalization describing both hydraulics and pneumatics; designed specifically to perform work. This can be done as a fluid cylinder or as an actuator. o Hydraulics: specification; the fluid which generates the power is a liquid. o Pneumatics: specification; the fluid which generates the power is a gas.  Differentiate between fluid transport and fluid power systems. o Fluid transport: delivery of a fluid from one location to another to accomplish some useful purpose(pumping stations for pumping water into homes, crosscountry gas lines, and systems where chemical processing takes places as various fluids are brought together. o Fluid power: designed specifically to perform work. Work is accomplished by a pressurized fluid bearing directly on an operating fluid cylinder or fluid motor.  Comment on the difference between using pneumatic fluid power and hydraulic fluid power. o In hydraulics; liquid/oil is used to transmit power, whereas in pneumatic; compressed gas (generally air) is used to transmit power.  What hydraulic device creates a force that can push or pull a load? o Hydraulic cylinder  What hydraulic device creates a torque that can rotate a shaft? o Rotary actuator  What two factors are responsible for the high responsiveness of hydraulic devices? o Multiplication of small forces and step less variable speed control.  Why can’t air be used for all fluid power applications? o Pneumatics systems exhibit spongy characteristics due to the compressibility of air. Pneumatics cannot withstand high pressures. They must be used in low pressures because the loads to be driven do not require large forces.  Name the six basic components required in a hydraulic circuit. o A tank (reservoir) to hold the hydraulic oil o A pump to force the oil through the system o An electric motor or other power source to drive the pump o Valves to control oil direction, pressure, and flow rate [Show More]

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