6.6、 Compound A and B are separated by a distillation tower. The ideal mixture follows Raoulfs law and Dalton’s law. The saturated vapor pressure of compound A and B are 75 and 40 mmHg, respectively. The concentration of overhead product, feed, and bottom product are 0.9, 0.5 and 0.1, respectively. The feed is liquid at the boiling point. What is the value of the minimum reflux ratio?
(A) 1.6 (B) 2.1 (C) 1.1 (D) 3.7
8.8、 The collection efficiency of a cyclone is 45% over the size range 0-5 mm, 80% over the size range 5-10 mm, and 96% for particles exceeding 10 mm. Calculate the total efficiency of collection for the following dust: 50% 0-5 mm, 30% 5-10 mm, 20% above 10 mm.
(C)53% (D) 65.7%
11.11、① create and assess primitive problem ；② process creation ；③ detailed process synthesis ； ④detailed design, equipment, sizing and optimization，上述四個步驟為進行程序設計主要
(A)①③②④ (B)①③④② (C)②①③④ (D)①②③④
28.28、Your heart beats at the rate of 70 times per minute, each beat pumping about 60 cm3 of fluid against a pressure of 120 mmHg. How much expansion work does the heart do in a day? (Note: The heart work does much more work than this. The heart muscles are contracting, the blood is accelerated, and there are frictional losses and other factors involved.)
(A) 9.68X101 J (B) 9.68x102 J (C) 9.68x103 J (D) 9.68x104 J
43.43、 What are the elements of the hierarchy of process design?
(A) Batch or continuous process (B) Input-output structure of process
(C) Recycle structure of process (D) General separation structure of process