chemical engineering process equipment and plant design MCQs – Page 6

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 Review each marked answer and report any item that may be outdated or unclear.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
101. Maximum size of the raschig rings used in a packed tower is about _______________ of the column diameter?
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A. 1/30th

B. 1/50th

C. 1/20th

D. 1/10th

102. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwins formula as___________________?
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A. d = 1.6 ?t

B. d = 1.1 t

C. d = 1.5 t

D. d = 3 ?t

103. The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________?
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A. d

B. 0.5 d

C. 0.75 d

D. 2 d

104. Filtration rate is affected by the________________?
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A. All A., B. and C.

B. Area of filtering surface & the viscosity of filtrate

C. Pressure drop across the cake & filter medium

D. Cake & filter medium resistance

105. For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between ______________________ times the tank diameter?
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A. 4 to 5

B. 2.5 to 3.5

C. 6 to 8

D. 1 to 1.5
106. The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid ?
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A. #NAME?

B. -q/(1-q)

C. #NAME?

D. None of these

107. For pipe flows, head is proportional to ______________ at constant capacity (where D = pipe diameter) ?
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A. 1/D2

B. D2

C. 1/D5

D. 1/D

108. In most of the shell and tube heat exchangers, the tube pitch is generally ______________ the tube diameter?
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A. one-fourth of

B. 2.5 times

C. Less than

D. 1.25-1.50 times
109. Steam is preferred to be used as a heating medium in heat exchangers, because of its_________________?
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A. High latent heat

B. Non-corrosive condensate

C. High film co-efficient

D. Low cost

110. Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than ______________ kilolitres?
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A. 20

B. 45

C. 85

D. 30

111. Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter) ?
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A. 0.80 D

B. 0.66 D

C. 0.5 D

D. 0.2 D
112. The minimum tray spacing in distillation column of diameter less than 3 ft is normally _____________ inches?
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A. 24

B. 34

C. 6

D. 18

113. (Le/D) for fully open gate valves would be __________________?
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A. Much more than that for fully open globe valves

B. Much less (say 2% than that for fully open globe valves)

C. Around 7

D. Both B. and C.
114. A riveted joint does not fail by _____________________ of rivets?
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A. Shearing

B. Tearing

C. None of these

D. Tearing of the plate across a row

115. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference ______________________?
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A. Is always more than arithmetic mean value and the geometric mean value

B. Is always less than arithmetic average 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

E. ther the flow of stream is co-current or counter-current

116. For a cylindrical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness ?
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A. Flat plate

B. Hemispherical

C. Conical

D. Ellipsoidal (2 : 1)
117. Correct use of factor of safety is very important in equipment design. It is defined as the ratio of the___________________?
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A. Ultimate stress to breaking stress

B. Working stress to ultimate stress

C. None of these

D. Ultimate stress to working stress
118. In a continuous distillation column, the optimum reflux ratio ranges from _______________ times the minimum reflux ratio?
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A. 2.2 to 2.6

B. 2.7 to 3

C. 1.6 to 2

D. 1.1 to 1.5
119. Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________?
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A. Hydrostatic head is required for refluxing the condensate

B. Only the function of condensation is to be carried out

C. Sub-cooling of condensate is desired

D. Both the functions of condensation & sub cooling are carried out in a single unit
120. In actual operation of a bubble cap distillation tower, the ______________ at the bottom of the tower is more than that at the top of the tower?
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A. Vapour molecular weight

B. Pressure and temperature

C. Molal flow rate of vapour

D. All A., B. and C.