chemical engineering process equipment and plant design Mcqs
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

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

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

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
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.
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

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
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.

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
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

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

142. Generally, elliptical dished heads____________________?
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B. ll of the same thickness and diameter

C. Resist half the pressure rating compared to hemi spherical head provided on the cylindrical

D. Are approximately as strong as seamless cylindrical shell having the corresponding I.D and

E. Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for

F. ssure vessels operating above a pressure of 1.5 MN/m2

144. Larger depth of liquid on the trays of a distillation column_________________?
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A. Leads to high tray efficiency

B. Results in higher pressure drop per tray

C. Both A. & B.

D. Neither A. or B.

147. Maximum allowable vapour velocity in a bubble cap tower is determined by the ____________________?
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A. None of these

B. Vapour density

C. Entrainment considerations

D. Diameter of the column