Which refrigerant will likely become scarce after the year 2020?
A) HCFC-123
B) HFC-410A
C) HFC-134a
D) Ammonia
Answer: A
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Typical clearance should be about ________ between each friction surface-lined and unlined plate.
A) 0.010 to 0.015 inch (0.25 to 0.38 mm) B) 0.050 to 0.075 inch (1.3 to 1.9 mm) C) 0.020 to 0.035 inch (0.050 to 0.090 mm) D) 0.001 to 0.005 inch (0.025 to 0.012 mm)
Soil in urban areas may be polluted with lead
Indicate whether the statement is true or false.
The body mass index (BMI) of a person is defined to be the person’s body mass divided by the square of the person’s height. The article “Influences of Parameter Uncertainties within the ICRP 66 Respiratory Tract Model: Particle Deposition” states that body mass index 
in men aged 25–34 is lognormally distributed with parameters µ = 3.215 and ? = 0.157.
a. Find the mean BMI for men aged 25–34. b. Find the standard deviation of BMI for men aged 25–34. c. Find the median BMI for men aged 25–34. d. What proportion of men aged 25–34 have a BMI less than 22? e. Find the 75th percentile of BMI for men aged 25–34.
The arc welding hand tool shown in the figure above is a _____
a. slag hammer b. flux remover c. chipping hammer d. bead cleaner