A mixture of ethyl alcohol and water with equimolar concentration is to be distilled in a seven plates column as a batch distillation with a reboiler at atmospheric pressure, if we neglect the residue liquid in condenser and reboiler, calculate :- A) State-1 (Constant XD).
The amount of distilled (D) and the a mount of heat required for ( 100 Kmole of Feed ) to get xD = 80 mole% , if R (reflux ratio must be increased till it reach=6.0 ) .
B) State-2 (Constant reflux ratio R).
The average value of xD (top product) & the a mount of heat if the concentration in the boiler must not less than 10 mole% ethanol if R is constant at = 4.0.
VLE for Ethanol-water are given in curve below:-

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed