Many hot water systems eliminate the need for storage tanks by using _____.

a. backflow preventers
b. tankless heaters
c. water softeners
d. recirculating pumps


b. tankless heaters

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The piston system shown in the accompanying figure is an example of what type of drawing?

What will be an ideal response?

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Which type of system requires more pumping horsepower for the water: open loop or closed loop?

What will be an ideal response?

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Which refrigerant type experiences the largest temperature glide?

A. azeotropes B. near-azeotropes C. zeotropes D. binary refrigerant blends

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All complete statements in Perl end with a(n) ____.

A. colon B. semicolon C. comma D. asterisk

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