Which of these devices is used for energy conservation?

a. Humidifier
b. Electronic air cleaner
c. Heat recovery ventilator
d. Chiller

c

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List the  disadvantages to using a dog clutch.?

What will be an ideal response?

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Which of the following refrigerants is a CFC-type refrigerant?

A. R-22. B. R-123. C. R-134a. D. R-12.

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A unit commonly used to express the metabolic rate for an average person under sedentary conditions is called

a. metabavg b. mravg c. met d. msed

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Construction companies must do what to protect their workers from fall hazards?