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Ram Sharma • 178.09K Points
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Q. 1) Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.

(A) 1/8 and 1/64
(B) 1/64 and 1/8
(C) 1/2 and 8
(D) 1/2 and 5
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Ram Sharma • 178.09K Points
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Q. 2) In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

(A) Less than
(B) 1.25-1.50 times
(C) 2.5 times
(D) One-fourth of
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Ram Sharma • 178.09K Points
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Q. 3) Value of Peclet number = 0, is the representative of

(A) Laminar flow
(B) Complete back mixing
(C) Plug flow
(D) Eddy diffusivity = 0
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Ram Sharma • 178.09K Points
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Q. 4) Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.

(A) It is unsuitable for concentrating those liquids, which form a scale or deposit salt
(B) It is suitable for process, in which the final product is a liquor instead of solid
(C) Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres
(D) Liquor flows inside the tube, while the steam is outside submerging the tube
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Ram Sharma • 178.09K Points
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Q. 5) Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

(A) The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation
(B) Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps
(C) The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4
(D) None of these
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Ram Sharma • 178.09K Points
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Q. 6) A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design

(A) Only if the opening is on spherical vessel
(B) Only if the opening is on a vertical cylinderical vessel
(C) Only if the opening is on a horizontal cylinderical vessel
(D) Irrespective of the shape of the vessel
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Ram Sharma • 178.09K Points
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Q. 7) __________ heat exchanger is also known as 'hair pin type' exchanger,

(A) Double pipe
(B) Finned
(C) Plate type
(D) Regenerative
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Ram Sharma • 178.09K Points
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Q. 8) __________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.).

(A) Hemispherical
(B) Dished
(C) Ellipsoidal
(D) Conical
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Ram Sharma • 178.09K Points
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Q. 9) The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 meters is __________ cms.

(A) 5
(B) 7.5
(C) 15
(D) 50
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Ram Sharma • 178.09K Points
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Q. 10) In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

(A) Aa = Sa
(B) 1.2 Aa = 1.2 Sa
(C) Sa = 1.5 Aa
(D) Aa = 1.5 Sa
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