What is meant by "blowing the cells open," and how can this event be controlled?
What will be an ideal response?
"Blowing the cells open" is the conversion of closed cells to open cells by the rupturing of the cell walls. This can be controlled by controlling the amount and rate of expansion of the gas inside the cells. This control can be achieved by limiting the expansion of the mold in high-pressure foam molding. It can also be
controlled by reducing the temperature at which the foaming occurs. Other methods that limit the expansion of a gas, such as increasing the pressure under that expansion occurs, can also prevent blowing the cells open.
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The ____ angle is the included angle of the curve.
A. primary B. delta C. secondary D. tertiary
Briefly describe rectangular coordinate dimensioning practice.
What will be an ideal response?
What shade lens should be worn when gas welding?
A. No. 3 B. No. 5 C. as dark as you want D. no lenses are needed
Which of the following would allow a system to operate more efficiently?
A. condenser that had refrigerant leaving with 10° of subcooling B. condenser that had refrigerant leaving with 15° of subcooling C. condenser that had refrigerant leaving as 100% vapor D. condenser that had refrigerant leaving with 10°F of superheat