Plant physiologists are responsible for studying and researching which of the following?
a. osmosis, nutrient uptake, translocation, respiration, photosynthesis, food movement, and
food storage
b. planting of new species of seeds, monitoring the irrigation of the seedlings, and weeding
new species
c. chemical composition of new herbicides
d. chemical composition of new pesticides
A
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Why is a large refrigerant leak potentially dangerous?
A) Most common refrigerants used in residential systems are highly flammable. B) Most common refrigerants used in residential systems are highly corrosive. C) Most common refrigerants used in residential systems are highly toxic. D) They can replace all of the oxygen, leading to asphyxiation.
A rear-wheel drive vehicle shudders or vibrates when first accelerating from a stop. The vibration is less noticeable at higher speeds. The most likely cause is ________
A) Brinelling of the U-joint B) Excessive U-joint working angles C) Drive shaft imbalance D) Unequal U-joint working angles
The rotating part of a DC motor that is mounted to the shaft is called ____.
A. field windings B. brushes C. armature D. magnets
In what year did it become necessary for all HVAC technicians to become certified to handle refrigerant under Section 608 of the Clean Air Act?
A. 1987 B. 1992 C. 1994 D. 1996