Which exhaust emission is formed by high combustion chamber temperatures?
A) CO B) C) NOx D) HC
C
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What should be used to remove a stud that has sheared flush to an engine block?
A. stud extractor B. drill and screw extractor C. oxy-acetylene torch D. pneumatic hammer
A(n) ____________________ bar chart is used to show comparisons for multiple aspects or groups of items.
Fill in the blank(s) with the appropriate word(s).
Why is a defrost cycle rarely needed for a dual-fuel heat pump system?
a. Electric heaters are used to melt the frost. b. Dual defrost thermostats are used. c. The balance point, where the heat pump shuts down, is generally above freezing. d. The furnace keeps the frost from forming on the outdoor coil.
Answer the following statement(s) true (T) or false (F)
1. The system head loss curve that describes head loss versus flow rate in a specific piping system is not very dependent on fluid properties and temperature. 2. Circulators with “flat” pump curves should be used when the objective is to maintain a relatively steady pressure differential across the distribution system over a wide range of flow rates. 3. When two identical circulators are connected in series, the resulting pump curve can be found by doubling the head produced by a single circulator at each flow rate. 4. The pump curve for two identical circulators connected in parallel is obtained by doubling the flow rate of a single circulator at each head value. 5. For a liquid at a given temperature, cavitation occurs anywhere the liquid’s pressure drops below its vapor pressure.