When refrigerants are exposed to glowing metal surfaces or flames:
A) Carbon monoxide is produced and should be vented.
B) A respirator capable of filtering fine dust must be worn.
C) Lethal phosgene gas is produced.
D) Best practices require the use of proper eye protection.
C
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The article “Integrating Risk Assessment and Life Cycle Assessment: A Case Study of Insulation” estimates that 5.6% of a certain population has asthma, and that an asthmatic has probability 0.027 of suffering an asthma attack on a given day. A person is chosen at random from this population. What is the probability that this person has an asthma attack on that day?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
Horizontal application of steel furring channels on walls is preferred.
What visual clues on a system can indicate the presence of a refrigerant leak?
A) Oil stains around the area of the leak B) A greenish stain around the area of the leak C) A visible cloud of refrigerant in the area of the leak D) Refrigerant bubbles forming around the leak
When selecting a workpiece clamp, be sure that it is rated _____
a. at least as high as the rated capacity of the welding machine b. no more than half of the rated capacity of the welding machine c. less than the median rated capacity of the welding machine d. at twice as high as the rated capacity of the welding machine