chemical engineering process equipment and plant design MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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
81. In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?
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A. 8

B. 180

C. 80

D. 1

82. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________?
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A. Decreases very rapidly

B. Remains constant

C. Increases linearly

D. Increases very rapidly

83. In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _______________ cms?
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A. 35

B. 10

C. 20

D. 30

84. In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for______________?
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A. Fixing the tubes

B. Creating turbulence

C. Reducing scale deposition

D. Increasing pressure drop

85. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _____________ the longitudinal stress?
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A. Equal to

B. Eight times

C. Half

D. Twice
86. In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as___________________?
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A. 0.1

B. 0.25

C. 0.8

D. 0.5

87. A cylindrical storage tank can have a self supported conical roof ?
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A. Irrespective of its diameter

B. If the thickness of the roof is more than that of the cylindrical shell

C. If its diameter is less than 15-20metres

D. If its diameter is more than 50 meters

88. Flanges are connected to pipes by _______________________?
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A. Welding

B. All A., B. and C.

C. Brazing

D. Screwing

89. The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from_________________?
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A. 1 to 1.5

B. 0.5 to 1

C. 1.5 to 2

D. 2 to 2.5

90. The most common standard size of bubble caps used in industrial operation is___________________?
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A. 4? dia cap with 8? dia riser

B. 6? dia cap with 4? dia riser

C. 8? dia cap with 1? dia riser

D. 1? dia cap with 0.5? dia riser

91. Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate ?
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A. 8

B. 2

C. 4

92. _______________ shaped roof is most commonly used for cylindrical tanks ?
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A. Dome

B. Cone

C. Umbrella

D. Flat

93. Friction factor for turbulent flow in a new pipe is given by____________________?
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B. f = 0.04/(NRe)0.16

C. f = 0.22 NRe

D. f = 25/NRe

E. f = 16/NRe

94. Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of _______________ type?
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A. Ring plate

B. Flared out

C. Fluid in

D. Nozzle or rim
95. LMTD correction factor is used in heat exchanger design for____________________?
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A. Multipass shell and tube heat exchanger

B. Fouling fluids

C. Double pipe heat exchanger

D. Counter flow of hot and cold fluids
96. Brass valves are usually made for pipe sizes ______________ inches?
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A. > 2.5

B. > 3.5

C. ? 2

D. ? 1

97. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the _________________?
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A. Diameter of the column

B. Allowable gas velocity through the slots

C. Plate spacing

D. All A., B. and C.

98. In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?
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A. 2.5

B. 20

C. 15

D. 7.5
99. For turbine agitator, the impeller diameter is about_________________?
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A. 0.95 d

B. 0.1 to 0.2 d

C. 0.65 to 0.85 d

D. 0.3 to 0.5 d
100. In a cylindrical vessel subjected to internal pressure, the longitudinal stress ?L and the circumferential stress, ?n are related by___________________?
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A. ?h = 2 ?L

B. ?h = ?L/2

C. No relation exists

D. ?h = ?L