____ product have the lowest embodied energy.
A. Petroleum-based SPF
B. Recycled and natural
C. Rigid foam
D. Man-made
Answer: B
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This type of gear is commonly used when a large speed reduction is required in a small space.
a. bevel gear b. helical gear c. spur gear d. worm gear
In series heat-reclaim systems, what happens to the heat from the refrigerant in the compressor discharge line?
A) It is used to cool the air in the store's HVAC system. B) It is used to preheat the air for the store's HVAC system. C) It flows to the heat-reclaim coil and condenser. D) It flows directly to the condenser.
The four categories of gear tooth wear are:
A. wear, surface fatigue, plastic flow, breakage. B. uneven wear, breakage, angling, tunneling. C. breakage, fatigue, liquification, angling. D. severe wear, plating, kerfing, wedging.
Which of the following statements is TRUE about these systems?
A) The R410a system can operate at half the suction line pressure drop of the R-22 system. B) The R-22 system can operate at the same suction line pressure drop of the R-410a system. C) The R-22 system can operate at twice the suction line pressure drop of the R-410a system. D) The R-410a system can operate at twice the suction line pressure drop of the R-134 system.