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1) The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre? a. 0.1-0.2 b. 0.2-0.5 c. 0.4-0.9 d. 1.2-1.5
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2) For a given design of bubble cap, the number of bubble caps to be used per tray is set by the _________________? a. Allowable gas velocity through the slots b. Plate spacing c. Diameter of the column d. All A., B. and C.
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3) A pipe is generally made of circular cross-section, because a circular cross-section has the____________________? a. Higher structural strength b. Lowest surface area requirement for a given volume c. Both A. & B. d. None of these
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4) In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference ______________________? a. Is always less than arithmetic average value b. Is always more than arithmetic mean value and the geometric mean value c. Is always less than arithmetic mean value, but more than geometric mean value d. May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current
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5) Maximum size of the raschig rings used in a packed tower is about _______________ of the column diameter? a. 1/10th b. 1/20th c. 1/30th d. 1/50th
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6) Width and depth of grooves in the tube sheet holes normally are _______________ inch respectively? a. 1/8 and 1/64 b. 1/64 and 1/8 c. 1/2 and 8 d. 1/2 and 5
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7) The shell side pressure drop in a shell and tube heat exchanger is maximum for _______________ baffle? a. Disk and ring b. Segmental c. Orifice d. Independent of the type of
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8) Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as ‘d’ will be__________________? a. d b. √d c. √(2πd) d. √(2d)
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9) Friction factor for turbulent flow in a new pipe is given by____________________? a. f = 16/NRe b. f = 0.04/(NRe)0.16 c. f = 0.22 NRe 0.5 d. f = 25/NRe
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10) To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of_________________? a. (1.2)3/2 b. (1.2)3/5 c. (1.2)2/3 d. (1.2)5/3
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11) Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger________________? a. Permits the use of less tubes in a given shell diameter b. Facilitates comparatively easier external cleaning because of large clearance c. Permits the use of more tubes in a given shell diameter d. Both B. and C.
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12) Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ______________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop? a. 25 b. 50 c. 75 d. 150
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13) The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure ? a. Flat plate b. Hemispherical c. Torispherical d. Ellipsoidal
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14) A stuffing box is used for____________________? a. Absorbing the contraction/expansion of pipeline due to temperature changes b. Prevention of fluid leakage around moving parts c. Facilitating smooth opening and closing of a valve d. Reducing the resistance of fluid flow
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15) The ratio of shear stress to shear strain is called ____________________? a. Bulk modulus b. Shear modulus c. Modulus of rigidity d. Modulus of elasticity
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16) In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of ________________ mm? a. 3-5 b. 5-11 c. 8-15 d. 12-18
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17) _____________________ tray arrangement is recommended for distillation column having diameter upto 4 ft ? a. Radial flow b. Cross flow c. Split flow d. Cascade
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18) In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _______________ cms? a. 10 b. 20 c. 30 d. 35
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19) Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________? a. More b. Less c. Same d. Either A. or B.; depends upon the I.D. of the pipe
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20) Speed of the drum of the rotary vacuum filter normally ranges from _____________ rpm? a. 0.1 to 2 b. 5 to 7 c. 3 to 8 d. 8 to 15
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