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1) In a continuous distillation column, the optimum reflux ratio ranges from _______________ times the minimum reflux ratio? a. 1.1 to 1.5 b. 1.6 to 2 c. 2.2 to 2.6 d. 2.7 to 3
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2) The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is ______________ stress? a. Shear b. Tensile c. Compressive d. Thermal
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3) Reflux ratio variation in a distillation column is between___________________? a. Zero and infinity b. Zero and one c. Minimum and infinity d. None of these
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4) Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than ______________ kilolitres? a. 20 b. 30 c. 45 d. 85
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5) In a heat exchanger, shell side fluid velocity can be changed by changing the tube _______________________? a. Layout b. Pitch c. Both A. & B. d. Neither A. nor B.
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6) Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about _____________ kcal/hr.m2.°C? a. 1250 b. 2500 c. 7500 d. 15000
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7) The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about ______________ kms? a. 1 b. 5 c. 15 d. 25
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8) In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of_____________? a. 1000 b. 3000 c. 5000 d. 10000
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9) (Le/D) for fully open globe value may be around__________________? a. 10 b. 25 c. 75 d. 300
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10) The value of fouling factor depends upon the__________________? a. Characteristic of process fluid b. Velocity of process fluid containing suspended solids c. Suspended solids in the fluid d. All A., B. and C.
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11) The operating pressure drop range in a bag filter is about ______________ mm water gauge? a. 50-150 b. 5-10 c. 500-1500 d. 1500-2500
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12) Which of the following lengths of heat exchanger tubes are normally not used in practice ? a. 2.5 metres b. 6 metres c. 10 metres d. 0.5 metre
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13) In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ______________ mm of water column per metre height of packing? a. 25-50 b. 50-75 c. 200-250 d. 750-1000
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14) Diameter of bubble caps used in high pressure columns is ______________ as compared to that used in identical vacuum columns? a. Less b. More c. Same d. Either A. or B.; no generalisation can be made
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15) Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_____________? a. More b. Same c. Less d. Twice
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16) A riveted joint does not fail by _____________________ of rivets? a. Tearing b. Shearing c. Tearing of the plate across a row d. None of these
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17) In a shell and tube heat exchanger, the ‘tube pitch’ is defined as the _____________________? a. O.D. of the tube for square pitch b. Shortest distance between two adjacent tube holes c. Shortest centre to centre distance between adjacent tubes d. None of these
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18) 25 per cent cut segmental baffle means that the baffle__________________? a. Height is 75% of the I.D. of the shell b. Height is 25% of the I.D. of the shell c. Spacing is 75% of its height d. Width is 25% of its height
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19) For a cylindrical vessel of moderate height, the weld joint efficiency for joints parallel to the cylindrical axis is given as 1.0; while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylindrical vessel, what value of weld joint efficiency should be used ? a. 0.8 b. 0.9 c. 1.0 d. (0.8)0.5
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20) Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure ? a. Larger dia vessel b. Smaller dia vessel c. Larger dia long vessel d. Strength of the vessel is same irrespective of the diameter
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