?What method for turning resins into expanded plastics involves forcing pentanes, hexanes, halocarbons, or moistures of these materials into the plastics particles under pressure?
A. ?liquid vaporization
B. ?whipping air into the resin and rapidly curing or cooling
C. ?dissolving a gas that expands at room temperature
D. ?thermal breakdown of a chemical blowing agent
Answer: D
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A(n) ____________________ engine has a piston that moves alternately up and down inside a cylinder.
Fill in the blank(s) with the appropriate word(s).
Explain why the micro-perforations in a membrane-type air-weather barrier allow water vapor to pass through but neither (liquid) water nor air.
What will be an ideal response?
Which tool is necessary to measure flatness of engine components?
A) Straight edge B) Feeler gauge C) Both A and B D) Neither A nor B
All of the following are steering principles for backing EXCEPT:
A. when the steering wheel is turned to the right, the rear of the trailer goes right B. the front tractor axle becomes the trailer's steering axle C. the amount that the trailer turns is proportional to the angle created between the trailer and the tractor D. the greater the angle of steering, the more the trailer will pivot and the more movement there will be to the rear