What type of open-close valve is used to completely close a line so piping or equipment can be isolated for repair, inspection, or replacement?

A. gate
B. ball
C. butterfly
D. plug


Answer: A

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Which plastics product has poor thermal stability and has been the focus of most heat stabilizers??

A. ?ABS B. ?epoxy C. ?PVC D. ?polypropylene

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Vegetable farms:

A) contribute little to the economy. B) require less management than other types of farms. C) are usually just a few acres near metropolitan areas. D) are operated as managed ecosystems.

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Technician A says that all port fuel injected systems use the speed density method. Technician B says that throttle body injection systems use the speed density method. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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Only the most expensive graphics subsystems are capable of displaying and manipulating shaded images in real time.

Answer the following statement true (T) or false (F)

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