chemical engineering process equipment and plant design MCQs – Page 4

Practise multiple-choice questions from chemical engineering process equipment and plant design for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering process equipment and plant design Mcqs
61. (Le/D) for fully open globe value may be around__________________?
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A. 10

B. 25

C. 300

D. 75

62. Reflux ratio variation in a distillation column is between___________________?
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A. None of these

B. Zero and infinity

C. Minimum and infinity

D. Zero and one

63. A stuffing box is used for____________________?
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A. Absorbing the contraction/expansion of pipeline due to temperature changes

B. Facilitating smooth opening and closing of a valve

C. Reducing the resistance of fluid flow

D. Prevention of fluid leakage around moving parts
64. Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger ?
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A. The viscous fluid should be routed through the shell side

B. The corrosive and fouling fluid should be preferably routed through the tubes

C. Higher pressure fluid stream should be routed through the shell side

D. Lower flow rate fluid should be routed through the shell side

65. _____________________ tray arrangement is recommended for distillation column having diameter upto 4 ft ?
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A. Cross flow

B. Split flow

C. Radial flow

D. Cascade

66. Joint efficiency (J) for a seamless pipe is_______________?
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A. < 0.5

B. 1

C. 0.85

D. 1.5

67. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of ______________ times the paddle diameter?
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A. 0.5 to 0.6

B. 0.65 to 0.80

C. 0.3 to 0.5

D. 0.1 to 0.25
68. ____________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.)?
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A. Hemispherical

B. Conical

C. Ellipsoidal

D. Dished

69. 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?
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A. Three fourth

B. Half

C. One fourth

D. Equal to

70. The stress developed in a material without any permanent set is called the____________________?
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A. Breaking stress

B. Elastic limit

C. Ultimate stress

D. Yield stress

71. Pressure drop per tray in the atmospheric distillation column is about ________________ psi?
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A. 0.01 0.5

B. 0.5 1.0

C. 1 3

D. 0.07 0.12
72. Which of the following lengths of heat exchanger tubes are normally not used in practice ?
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A. 6 metres

B. 10 metres

C. 0.5 metre

D. 2.5 metres

73. The force due to wind load acting on a tall vessel depends upon its___________________?
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A. Shape

B. All A, B. & C.

C. Height

D. Outside diameter

74. The retention time of material in a rotary dryer depends upon its ______________________?
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A. Slope & length

B. Flights arrangement

C. rpm

D. All A., B. and C.
75. Pressure drop (?p) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as_________________?
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A. ?p = G0.5

B. ?p = G

C. ?p = 1/G0.6

D. ?p = G2
76. Lug support is meant for supporting _______________ vessels?
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A. Large horizontal cylindrical

B. Small

C. Thick walled tall

D. Tall but empty

77. In shell and tube heat exchangers, straight tie rods are used to_________________?
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A. Hold baffle in space

B. None of these

C. Account for thermal strain

D. Fix the tubes in position

78. 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-Thieles method, this method_________________?
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A. accounts for the enthalpy changes in the process

B. s method

C. is more accurate in finding the number of equilibrium stages

D. Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in

E. All A, B. & C.
79. Hoop (circumferential) stress induced in a thin walled Horton Sphere used for the storage of liquid ammonia under pressure is____________________?
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A. pD/3T

B. pD/4T

C. pD/2T

D. pD/6T

80. Pick out the wrong statement pertaining to the design of a long tube vertical evaporator ?
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A. Steam is fed to the shell, whereas the liquor is filled inside the tube

B. Tube dia is 3-6 cms, while tube length in 3-6 metres

C. Liquor level is maintained at 1/3rd to 1/2 of the height of the tube

D. None of these