chemical engineering process equipment and plant design MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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

121. Which of the following packing materials provides for maximum mass transfer ?
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A. All give the same value

B. Cross-partition rings

C. Raschig rings

D. Raschig rings

122. Bubble cap plate column is___________________?
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A. Used only for distillation, not for absorption

B. A continuous contactor

C. A finite stage contactor

D. A differential stage contactor

123. 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_________________?
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A. (1.2)3/5

B. (1.2)3/2

C. (1.2)2/3

D. (1.2)5/3

124. n the agitators, the power required will be changed with the increase of diameter of agitator D. as ____________________?
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A. D5

B. D2

C. D

D. D9

125. The ratio of linear stress to linear strain is termed as the ____________________?
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A. Modulus of rigidity

B. None of these

C. Bulk modulus

D. Modulus of elasticity

126. Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ? = yield strength and E = modulus of elasticity) ?
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A. E

B. ?

C. E/?

D. ?/E

127. Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger________________?
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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.

128. 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?
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A. 100-150

B. 5-Jan

C. 20-40

D. 1000-1500

129. Width and depth of grooves in the tube sheet holes normally are _______________ inch respectively?
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A. 1/64 and 1/8

B. 1/2 and 8

C. 1/2 and 5

D. 1/8 and 1/64

130. Overall tray efficiency of a distillation column is the ratio of the number of ___________________?
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A. Overall gas transfer units to the number of ideal trays required

B. Ideal trays required to the number of real trays required

C. Real trays required to the number of ideal trays required

D. None of these

131. Thin spherical shells subjected to internal pressure, develop ______________ stresses?
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A. Radial

B. Circumferential

C. Both A. & B.

D. Neither A. nor B.

132. Speed of industrial paddle agitator ranges from _____________ rpm?
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A. 500 to 750

B. 1000 to 2000

C. 20 to 100

D. 1 to 5

133. Accidents in chemical plants are mostly due to___________________?
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A. Improper layout of the equipments

B. Failure of equipments

C. Inadequate equipment design

D. Faulty operating procedures

134. Welded joint efficiency in the design of chemical process equipment is taken as_________________?
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A. 0.75

B. 0.95

C. 0.85

D. 0.55

135. In case of design of a shell and tube heat exchanger___________________?
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A. mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than

B. All A., B. & C.

C. Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

D. Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto

E. O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres

F. e diameter

136. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?
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A. Corner torus section and central dished section

B. Central dished section and corner torus section

C. Central dished section and straight flange section

D. Straight flange section and corner torus section

137. Length to diameter ratio of most rotary driers is in the range of____________________?
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A. 10 to 20

B. 20 to 30

C. 4 to 10

D. 1 to 2

138. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?
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A. 1/10-1/15th

B. 1/5-1/10th

C. 1/2 to 1/4th

D. 1/20-1/30th

139. Column support for the roof of cylindrical storage tank must be provided for___________________?
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A. All tanks irrespective of their heights and diameters

B. Large diameter tanks

C. Small diameter tanks

D. Small diameter tall tanks

140. Poissons ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poissons ratio for structural and pressure vessel steel may be taken as ____________________?
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A. 0.95

B. 0.3

C. 0.75

D. 0.01

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