A multiple evacuation means that ____.
A. you connect three vacuum pumps simultaneously to a refrigeration system and pull a vacuum
B. you pull a vacuum on three different systems at the same time
C. you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure
D. there must be more than one system operating before a vacuum can be pulled
Answer: C
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Which of the following statements is true?
A. Bubble-point pressure calculations are normally easier than bubble-point temperature calculations, since the pure-component vapor pressures are fixed (since the system is at constant temperature). B. When you flash a liquid by lowering the pressure isothermally, the result will always be a two-phase (liquid and vapor) system. C. If given the preference between data obtained experimentally or data obtained from a model, it is generally best to use the model data since those do not contain experimental errors. D. Azeotropes will only form for systems when they exhibit positive deviations from Raoult’s Law. E. None of the above are true.
To ____ a computer means to remove the existing programming and overwrite it with new software.
A. reset B. feed C. override D. flash
Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size shall have an allowable ampacity not less than the noncontinuous load plus ____ of the continuous load.
A. the minimum B. the maximum C. the average D. 125%
Use KCL to find the current i1 and i2 in Figure P2.14.
Known quantities:
Find:
