A hybrid seedling population is usually uniform and shows increased growth and productivity. This phenomenon is called ________.

Fill in the blank(s) with the appropriate word(s).


heterosis, hybrid vigor

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Technician A says that visual inspection is one of the most important factors of good failure analysis practice. Technician B says that laboratory analysis is usually required to accurately pinpoint root cause. Who is correct?

A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B

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In a domestic freezer using R-12, if the suction pressure reading is 1.3 psig, the evaporator boiling point is ____°F.

A. +18 B. +10 C. -12 D. -18

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Technician A says that coolant from the upper radiator hose should be cooler than coolant from the lower radiator hose. Technician B says that many front wheel drive vehicles use a cooling fan mounted to the engine's water pump shaft. Which technician is correct?

A) Technician A only B) Technician B only C) Both Technicians A and B D) Neither Technician A nor B

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Technician a says that R-1234yf may be used to retrofit an R-134a system. Technician B says that R-1234yf is an ozone depleting gas

A) A only B) B only C) Both A and B D) Neither A or B

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