If a diesel engine is run with a rich air-fuel-ratio, which of the following tailpipe emissions would be likely to increase?
A. HC
B. NOx
C. sulfur dioxide
D. nitrogen dioxide
Answer: A
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A penny and a nickel are tossed. The penny has probability 0.4 of coming up heads, and the nickel has probability 0.6 of coming up heads. Let X=1 if the penny comes up heads, and let X=0 if the penny comes up tails. Let Y=1 if the nickel comes up heads, and let Y=0 if the nickel comes up tails.
a. Find the probability mass function of X. b. Find the probability mass function of Y. c. Is it reasonable to assume that X and Y are independent? Why? d. Find the joint probability mass function of X and Y.
Construction of the Erie Canal
A. forced some New England farmers to move or change occupations. B. showed how long-established local markets could survive a continental economy. C. helped farmers so much that industrialization was slowed. D. was completed without any financial support or expenditures from the state of New York. E. created political tensions between the Northeast and the Midwest.
What type of blower configuration requires a water-filled P-trap to ensure proper condensate draining?
A) Push-through evaporator with blower upstream B) Draw-through evaporator with blower downstream C) No P-trap is needed on rooftop installations. D) Blower configuration does not affect drainage.
Smaller homes can be designed with ____, a design that places all plumbing close together to reduce pipe lengths, with short pipe runs to the fixtures.
A. pinpoint plumbing B. a single plumbing core C. a minimized plumbing center D. a reduced plumbing outlet