MCQOPTIONS
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MCQOPTIONS
This section includes 324 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always ? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | Equal to the order of reaction |
| Answer» D. Equal to the order of reaction | |
| 52. |
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from__________________? |
| A. | 2 to 3 |
| B. | 3 to 5 |
| C. | 4 to 8 |
| D. | 6 to 12 |
| Answer» D. 6 to 12 | |
| 53. |
The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _____________ stress? |
| A. | Yield point |
| B. | Breaking |
| C. | Ultimate |
| D. | None of these |
| Answer» D. None of these | |
| 54. |
The ratio of shear stress to shear strain is called ____________________? |
| A. | Bulk modulus |
| B. | Shear modulus |
| C. | Modulus of rigidity |
| D. | Modulus of elasticity |
| Answer» C. Modulus of rigidity | |
| 55. |
The ratio of lateral strain to linear strain is termed as the___________________? |
| A. | Poisson’s ratio |
| B. | Bulk modulus |
| C. | Modulus of elasticity |
| D. | Shear modulus |
| Answer» B. Bulk modulus | |
| 56. |
The ratio of linear stress to linear strain is termed as the ____________________? |
| A. | Modulus of elasticity |
| B. | Modulus of rigidity |
| C. | Bulk modulus |
| D. | None of these |
| Answer» B. Modulus of rigidity | |
| 57. |
The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________? |
| A. | 0.5 to 1 |
| B. | 1 to 1.5 |
| C. | 1.5 to 2 |
| D. | 2 to 2.5 |
| Answer» B. 1 to 1.5 | |
| 58. |
The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is____________________? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.25 |
| Answer» B. 0.50 | |
| 59. |
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 |
| Answer» D. 1.2-1.5 | |
| 60. |
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the_________________? |
| A. | Equal sized reactors are the best |
| B. | Smaller reactor should come first |
| C. | Larger reactor should come first |
| D. | None of these |
| Answer» C. Larger reactor should come first | |
| 61. |
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________________ mm of water column per metre height of packing? |
| A. | 1-5 |
| B. | 20-40 |
| C. | 100-150 |
| D. | 1000-1500 |
| Answer» C. 100-150 | |
| 62. |
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 |
| Answer» B. 5-10 | |
| 63. |
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 |
| Answer» C. 10-50 | |
| 64. |
The normal range of velocity of steam in pipes is _________________________ m/sec? |
| A. | 0.1-0.5 |
| B. | 1-5 |
| C. | 10-20 |
| D. | 80-100 |
| Answer» E. | |
| 65. |
The necessary wall thickness for a metallic storage vessel is a function of the ___________________? |
| A. | Ultimate tensile strength (or yield point) of the material and operating temperature |
| B. | Operating pressure and welding/joint efficiency |
| C. | Diameter of the vessel |
| D. | All A., B. and C. |
| Answer» E. | |
| 66. |
The most common standard size of bubble caps used in industrial operation is___________________? |
| A. | 1″ dia cap with 0.5″ dia riser |
| B. | 6″ dia cap with 4″ dia riser |
| C. | 8″ dia cap with 1″ dia riser |
| D. | 4″ dia cap with 8″ dia riser |
| Answer» C. 8″ dia cap with 1″ dia riser | |
| 67. |
The minimum tray spacing in distillation column of diameter less than 3 ft is normally _____________ inches? |
| A. | 6 |
| B. | 18 |
| C. | 24 |
| D. | 34 |
| Answer» B. 18 | |
| 68. |
The minimum shell thickness for tank ≤ 15 metres diameter is limited to _______________ mm, for reasons of elastic stability? |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | 15 |
| Answer» C. 10 | |
| 69. |
The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _____________ inches? |
| A. | 6 |
| B. | 12 |
| C. | 18 |
| D. | 36 |
| Answer» D. 36 | |
| 70. |
The minimum baffle height should be ______________? |
| A. | Equal to the impeller diameter |
| B. | Twice the impeller diameter |
| C. | Twice the tank diameter |
| D. | 3/4 of the tank height |
| Answer» C. Twice the tank diameter | |
| 71. |
The maximum liquid gradient over a tray must not exceed__________________? |
| A. | 0.5″ -1.25″ |
| B. | 2″-3.5″ |
| C. | 5″ |
| D. | Half the tray spacing |
| Answer» B. 2″-3.5″ | |
| 72. |
The longitudinal stress induced in a thin walled cylindrical vessel under internal pressure is_________________? |
| A. | pd/2t |
| B. | pd/4t |
| C. | pd/t |
| D. | pd/8t |
| Answer» C. pd/t | |
| 73. |
The LMTD correction factor (FT) is defined as the __________________? |
| A. | Ratio of true temperature difference to the LMTD |
| B. | Ratio of LMTD to the true temperature difference |
| C. | Differenced of true temperature difference and the LMTD |
| D. | Geometric mean of the true temperature difference and the LMTD |
| Answer» B. Ratio of LMTD to the true temperature difference | |
| 74. |
The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ? |
| A. | 0.6-0.8 times |
| B. | Equal to |
| C. | Twice |
| D. | 2 ft irrespective of (for column > 3 ft diameter) |
| Answer» B. Equal to | |
| 75. |
The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is ________________ cms? |
| A. | 5 |
| B. | 15 |
| C. | 7.5 |
| D. | 50 |
| Answer» C. 7.5 | |
| 76. |
The function of manholes provided in the shell of a distillation column is to __________________? |
| A. | Keep a check on the liquid gradient over the plate by direct visual observation |
| B. | Give access to the individual trays for cleaning, maintenance and installation |
| C. | Guard against foaming & entrainment by dumping antifoaming agent through it |
| D. | All A., B. and C. |
| Answer» C. Guard against foaming & entrainment by dumping antifoaming agent through it | |
| 77. |
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. |
| Answer» E. | |
| 78. |
The equivalent diameter for pressure drop is _______________ that for heat transfer? |
| A. | Smaller than |
| B. | Greater than |
| C. | Equal to |
| D. | Not related with |
| Answer» E. | |
| 79. |
The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area ‘A’ is given by (where, P = perimeter of the channel in contact with the fluid) ? |
| A. | 4 A/P |
| B. | A/P |
| C. | 4 P/A |
| D. | √A |
| Answer» B. A/P | |
| 80. |
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 |
| Answer» E. | |
| 81. |
The dust collection efficiency of electrostatic precipitator increases with increase in the_________________? |
| A. | Gas flow rate |
| B. | Electrode area |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. & B. | |
| 82. |
The dust collection efficiency of a cyclone separator_________________? |
| A. | Decreases with increase in gas flow rate |
| B. | Is inversely proportional to the mass of the dust particle |
| C. | Is directly proportional to the radius of the dust particle path |
| D. | None of these |
| Answer» E. | |
| 83. |
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called____________________? |
| A. | Downcomer liquid seal |
| B. | Static submergence |
| C. | Skirt clearance |
| D. | None of these |
| Answer» C. Skirt clearance | |
| 84. |
The distance between the centres of a rivet hole to the nearest edge of the plate is called _________________? |
| A. | Pitch |
| B. | Margin |
| C. | Back pitch |
| D. | None of these |
| Answer» C. Back pitch | |
| 85. |
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is_________________? |
| A. | < 30 |
| B. | < 7 |
| C. | > 7 20 < 50 |
| Answer» C. > 7 20 < 50 | |
| 86. |
The diameter of a propeller agitator used in agitation tank ranges from ____________ percent of the tank diameter and its peripheral speed is normally 300 to 500 metres/minute ? |
| A. | 5 to 10 |
| B. | 15 to 30 |
| C. | 40 to 50 |
| D. | 55 to 75 |
| Answer» C. 40 to 50 | |
| 87. |
The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress? |
| A. | Working |
| B. | Damaging |
| C. | Allowable |
| D. | None of these |
| Answer» C. Allowable | |
| 88. |
The clearance between two tubes in a shell and tube heat exchanger is known as ‘ligament’, whose minimum value is _____________ the outside diameter of the tube, but in no case it should be less than 4.5 mm? |
| A. | Equal to |
| B. | Half |
| C. | One fourth |
| D. | Three fourth |
| Answer» D. Three fourth | |
| 89. |
The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is______________________? |
| A. | pd/2t |
| B. | pd/4t |
| C. | pd/t |
| D. | pd/3t |
| Answer» B. pd/4t | |
| 90. |
The buckling tendency of compression members is always in the direction of the _____________________? |
| A. | Least radius of gyration |
| B. | Axis of the load |
| C. | Perpendicular to the axis of the load |
| D. | None of these |
| Answer» B. Axis of the load | |
| 91. |
The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ? |
| A. | 2 |
| B. | 1/2 |
| C. | 4 |
| D. | 1/4 |
| Answer» D. 1/4 | |
| 92. |
The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________? |
| A. | 0.5 d |
| B. | 0.75 d |
| C. | d |
| D. | 2 d |
| Answer» D. 2 d | |
| 93. |
The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ? |
| A. | S1/S2 |
| B. | S1.S2 |
| C. | S2/S1 |
| D. | 1/S1.S2 |
| Answer» B. S1.S2 | |
| 94. |
Seamless pipe is made________________? |
| A. | From rolled strips formed into cylinders and seam-welded |
| B. | By extrusion & casting into static and centrifugal molds |
| C. | By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing |
| D. | Both B. and C. |
| Answer» E. | |
| 95. |
Scale up problem in design based on the similarity concept takes into account _______________ similarity? |
| A. | Geometrical |
| B. | Kinematic |
| C. | Dynamic |
| D. | All A., B. and C. |
| Answer» E. | |
| 96. |
Safety valves are provided in chemical equipments to guard against excessive_________________? |
| A. | Temperature |
| B. | Pressure/pressure fluctuation |
| C. | Turbulence |
| D. | Noise |
| Answer» C. Turbulence | |
| 97. |
Saddle supports are used for supporting _____________ vessels? |
| A. | Horizontal cylindrical |
| B. | Tall vertical |
| C. | Thick walled vertical |
| D. | Thick spherical |
| Answer» B. Tall vertical | |
| 98. |
Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________? |
| A. | 0.01 to 1 |
| B. | 1.5 to 2.5 |
| C. | 5 to 10 |
| D. | 10 to 20 |
| Answer» C. 5 to 10 | |
| 99. |
Rivets are generally specified by the____________________? |
| A. | Head diameter |
| B. | Shank diameter |
| C. | Overall length |
| D. | None of these |
| Answer» C. Overall length | |
| 100. |
Removable connection of tubes to tube sheet is called___________________? |
| A. | Ferrule |
| B. | Socket |
| C. | Nipple |
| D. | Saddle |
| Answer» B. Socket | |