Question 71. A control valve, with a turndown ratio of 50, follows equal percentage characteristics. The flow rate of a liquid through the valve at 40% stem position is 1 m3/h. What will be the flow rate in m3/h at 50% stem position, if the pressure drop across the valve remains unchanged? (Up to 2 digits after
the decimal point.) ________

Question 72. Match the reactant-product combination in Group 1 with the unit process in Group 2.Group 1                              Group 2(P) propylene - butanol  (1) Pyrolysis(Q) cumene - phenol (2) Dehydrogenation(R) butane - butadiene (3) Hydroformylation(S) ethylene dichloride - vinyl chloride (4) Peroxidation

Question 73. Identify which of the following statements are FALSE. (P) Oils with an oleic radical (1 double bond) are more suitable than oils with a linolenic radical
(3 double bonds) as film forming vehicles for paints (Q) Production of synthesis gas from coal and steam is an endothermic process (R) Use of chlorine for bleaching of wood pulp results in the release of dioxins (S) In the manufacture of urea from ammonia, the main intermediate product formed is ammonium bicarbonate

Question 74. A counter-current extraction column is designed to remove 99% of solute C from a solution of solvent A and solute C using pure solvent B. The initial concentration of solute in the solution of A + C is 20 wt %, and the total flow of solution is 1000 kg/h. If the equilibrium relationship is Y = 2X , where Y = mass of C/mass of A and X = mass of C/mass of B.T he minimum flow rate of solvent B required (in kg/h) is

Question 75. A counter-current extraction column is designed to remove 99% of solute C from a solution of solvent A and solute C using pure solvent B. The initial concentration of solute in the solution of A + C is 20 wt %, and the total flow of solution is 1000 kg/h. If the equilibrium relationship is Y = 2X , where Y = mass of C/mass of A and X = mass of C/mass of B.
I f the flow rate of B is 2400 kg/h, then the theoretical number of stages in the column, using Kremser's equation (adjusted to the next integer) is

Question 76. Given the sequence of terms, AD CG FK JP, the next term is

Question 77. Which of the following assertions are CORRECT? P: Adding 7 to each entry in a list adds 7 to the mean of the list Q: Adding 7 to each entry in a list adds 7 to the standard deviation of the list R: Doubling each entry in a list doubles the mean of the list S: Doubling each entry in a list leaves the standard deviation of the list unchanged

Question 78. The half-life of an nth order reaction in a batch reactor depends on

Question 79. For which of the following combinations, does the absorption operation become gas-film controlled? P. The solubility of gas in the liquid is very high Q. The solubility of gas in the liquid is very low R. The liquid-side mass transfer coefficient is much higher than the gas-side mass transfer coefficient S. The liquid-side mass transfer coefficient is much lower than the gas-side mass transfer coefficient

Question 80. The final boiling points of gasoline, diesel, atmospheric gas oil (AGO) and lubricating oils vary as