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1) Larger depth of liquid on the trays of a distillation column_________________? a. Leads to high tray efficiency b. Results in higher pressure drop per tray c. Both A. & B. d. Neither A. or B.
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2) Needle valves are generally not used for___________________? a. Very large diameter pipes b. High pressure throttling service c. Very accurate flow control d. Smaller sizes of pipe
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3) In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area) ? a. Aa = Sa b. 1.2 Aa = 1.2 Sa c. Sa = 1.5 Aa d. Aa = 1.5 Sa
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4) Welded joint efficiency in the design of chemical process equipment is taken as_________________? a. 0.55 b. 0.75 c. 0.85 d. 0.95
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5) Floating head heat exchangers are used for the____________________? a. Heat transfer between corrosive fluids b. Cases where temperature difference between the shell and the tubes is more (>50°C) c. Co-current heat transfer systems d. Counter-current heat transfer systems
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6) Theoretically calculated diameter of the stripping section of the continuous rectification column is ______________ that of the enriching section? a. Less than b. More than c. Same as d. Either more or less (depending upon relative volatility
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7) Safety valves are provided in chemical equipments to guard against excessive_________________? a. Temperature b. Pressure/pressure fluctuation c. Turbulence d. Noise
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8) An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________? a. Drain the liquid from the tray when the unit is not in operation b. Allow for thermal expansion and facilitate installation c. Avoid back-trapping d. None of these
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9) A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator__________________? a. Is economical in operation b. Employs high velocity, high heat transfer rate and less heating surface requirement c. Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle d. Both B. & C.
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10) Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs? a. Conical b. Flat c. Floating d. Fixed
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11) What is the slope of the operating line in the stripping section of a distillation column ? a. 0 b. ∞ c. > 1 d. < 1
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12) The safe height (h) to diameter D. ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than _________________? a. 1 b. 2 c. 3 d. 3.5
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13) Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele’s method, this method_________________? a. is more accurate in finding the number of equilibrium stages b. accounts for the enthalpy changes in the process c. Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method d. All A, B. & C.
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14) Rate of filtrate delivery is inversely proportional to the___________________? a. Filtering area & the pressure difference driving force b. Viscosity of filtrate c. Cake & filter medium resistance d. Both A. and B.
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15) Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger ? a. The corrosive and fouling fluid should be preferably routed through the tubes b. The viscous fluid should be routed through the shell side c. Lower flow rate fluid should be routed through the shell side d. Higher pressure fluid stream should be routed through the shell side
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16) What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ? a. 6.5 cms b. 6.5 mm c. Equal to tube I.D d. Equal to tube O.D
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17) The normal range of velocity of water in pipes is _______________ m/sec? a. 0.1-0.5 b. 1-2 c. 10-50 d. 15-30
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18) Brass valves are usually made for pipe sizes ______________ inches? a. ≤ 1 b. ≤ 2 c. > 2.5 d. > 3.5
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19) The force due to wind load acting on a tall vessel depends upon its___________________? a. Shape b. Outside diameter c. Height d. All A, B. & C.
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20) Pick out the wrong statement pertaining to the design of the distillation column? a. Generally, a skirt clearance of 0.5″ to 1.5′ is recommended to prevent plugging of the slots by residue build up b. The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles c. If sufficient slot area is not provided, the gas may pass through the skirt clearance d. None of these
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