All of the following statements are true EXCEPT:
A. if mineral oil is mistakenly installed in an R-134A system, it will not lubricate the compressor properly and will separate in the accumulator.
B. moisture causes fewer problems in R-134A systems because it mixes with the PAG oil.
C. moisture control in R-134A is provided by the desiccant in the receiver/dryer or the evaporator.
D. commercial refrigeration units use ester oils, which are hygroscopic.
Answer: D
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Steroid hormones
A) are proteins. B) are structurally similar to cholesterol. C) are the largest class of hormones. D) include pancreatic hormones. E) are secreted by the hypothalamus and pituitary gland.
Technician A says that most current engine brakes use the engine ECM to manage braking cycles. Technician B says that modern engine brakes can perform the majority of the braking requirements of a transport truck. Who is right?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
In the future the federal government is destined to become more involved in preserving limited resources
Indicate whether the statement is true or false
Using the formula 1 kg = 2.205 pounds, 165 pounds converts to a weight of _____
a. 10.3 centimeters b. 74.8 kilograms c. 149.6 milligrams d. 363.8 kilometers