What opens and closes the valves in a reciprocating compressor?

A) Pressure difference across the valves B) Hydraulic valve lifters
C) A cam shaft D) The piston pushes them open.


A

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A heavy, broken line made up of a series of long and short dashes alternately spaced is known as a ____ line.

A. break B. section C. chain D. short

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What is the balanced equation for this reaction?

AD+B+C?AB+ADC+BD A. 8AD+10B+C?5AB+3ADC+5BD B 8AD+10B+2C?5AB+3ADC+5BD C. The equation is already balanced. D. 8AD+10B+3C?5AB+3ADC+5BD E. None of these

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____ laws are often referred to as the conservation laws.

A. Leyden's B. Kirchhoff's C. Ohm's D. Volta's

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A helper is always needed for _____.

Fill in the blank(s) with the appropriate word(s).

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