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.
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?
Period and frequency mean the same thing.
a. True b. False