Which of the following statements about ammonia as a refrigerant is true?
A) Ammonia is slightly less efficient in heat transfer than halocarbon refrigerants.
B) Ammonia costs more than other common refrigerants.
C) Ammonia is poisonous and must be handled with extreme care.
D) Ammonia piping cannot be constructed from copper.
Answer: D
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Government-run hatcheries produce fish for sport
Indicate whether the statement is true or false
Technician A says that all metal-to-metal contact areas of the disc brake system should be lubricated with special brake grease for proper operation. Technician B says that the lubrication helps reduce brake noise (squeal). Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Why is it recommended that an acetylene cylinder valve never be opened more than one-half turn?
A) To allow rapid shutoff in the case of an accident B) To minimize the strain of the high cylinder pressures on the valve threads C) To regulate the pressure to the torch handle D) To prevent the valve from getting stuck in the fully opened position
What is the purpose of a Tattle Tale?
A) To tell the technician if the limits have opened at any time during the unit's operation B) To prevent the limits from ever being exceeded in the furnace C) To tell the electric furnace to turn off if the limits have been exceeded D) To tell the technician if the furnace is turning on properly