List the types of compressors and briefly explain how they operate
What will be an ideal response?
• Reciprocating – uses pistons in a cylinder. Gas is compressed by squeezing it between the piston and a valve plate at the top of the cylinder.
• Rotary – uses a roller that rotates in an orbital motion within a cylinder. Gas is compressed by squeezing it between the roller and a spring-loaded vane.
• Screw – uses two rotating screws shaped like augers. Gas is compressed by squeezing it between the two screws
• Centrifugal - has a very high-speed centrifugal impeller that spins within a housing. The gas enters the impeller in the center and is thrown outwards by centrifugal force, compressing the gas.
• Scroll - has a stationary scroll and an orbiting scroll that moves within the stationary scroll. Gas is compressed by squeezing it between the two scrolls.
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The accompanying figure shows a low-voltage switch, commonly used in a remote control lighting circuit. Explain how each of the four terminals are usually connected.
Period and frequency mean the same thing.
a. True b. False
The yolk of an egg is made up primarily of:
a. protein c. lipid b. water d. carbohydrate
Given: Cross-classification data for the Jeffersonville Transportation Study Area Develop the family of cross-classification curves. Determine the number of trips produced (by purpose) for a traffic zone containing 500 houses with an average household income of $35,000. (Use high = $55,000; medium = $25,000; low = $15,000.)
What will be an ideal response?