Draw a two-shell-passes and eight-tube-passes shell-and-tube heat exchanger. What is the primary reason for using so many tube passes?
What will be an ideal response?
Using so many tubes increases the heat transfer surface area which in turn increases the rate of heat transfer.
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In the air conditioning field, variable frequency drive is ____ used to control the speed of blower motors.
a. never b. often c. always d. rarely
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When diesel fuel is used as the pilot in a dual diesel/CNG fuel system, what role does the diesel fuel play?
A. ignition agent B. lowers emissions C. reduces particulate matter D. increases engine output power
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Vapor loss from a south-facing slope in Australia would likely be higher than from a north-facing slope
Indicate whether the statement is true or false
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Machine screws can have a(n) _____ head.
A. round B. fillister C. oval D. all answers are correct
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