If a dwell exists in a cam cycle, the cam follower can jump if the application speed is too high.
Answer the following statement true (T) or false (F)
True
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During ____________________, separate systems reform and usually clean the fuel.
Fill in the blank(s) with the appropriate word(s).
Why are steam boilers used in applications requiring a large heating capacity?
A) Because steam pumps operate more efficiently than hot water pumps B) Because it takes 10 times more heat to boil a pound of water than to change its temperature 100°F C) Because a pound of steam takes up less space than a pound of water D) Because hot water boilers cannot maintain a temperature over 212°F
The most common fan used for moving air through ductwork in residential air conditioning is
A) Forward curved centrifugal B) Backward curved centrifugal C) Vane axial D) Propeller
How does certification affect heating equipment in the United States?
A) All heating equipment undergoes voluntary testing and certification by accredited testing agencies. B) All gas appliances are exempt from certification but must be tested by an accredited testing agency. C) Only electric heating equipment is required to have testing or certification by an accredited testing agency. D) All heating equipment must be tested, certified, or listed by an accredited testing agency.