## A straw oil that is used to absorb benzene from coke-oven gas, is to be steam-stripped in a sieve-plate column at 1 atm to recover benzene

Henry’s law is used to approximate the equilibrium data at the operating temperature. 100 moles of oil entering the absorber contains 8 mol % benzene, 75% of which is to recovered. The steam leaving the absorber contains 3 mol % benzene. The oil is assumed to be nonvolatile. Additionally, it is given that when the oil phase contains 10 mol % benzene, its partial pressure is 5.07 kPa.

1.1. Draw a schematic diagram to represent the process. (2)

1.2. Determine graphically the number of transfer units required. (20)

1.3. Determine the amount of fresh steam required. (3)

### Calculate the maximum achievable bridge out-of-balance voltage for an applied torque T of 103 N m given the following

Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

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A solid-state capacitive humidity sensor has a capacitance given by: C = 1.7 RH + 365pF where RH is the percentage relative humidity. The sensor has an associated parallel resistance….

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A pitot tube is used to measure the mean velocity of high pressure gas in a 0.15 m diameter pipe. At maximum flow rate the mean pitot differential pressure is….