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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be more than that for fluid flow. [other wrong options] [Discuss in forum] same as that for fluid flow. less than that for fluid flow. D2 - D1 (D1 and D2 are I.D. of inner and outer pipes respectively). |
Q42 ⇒ In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around 1.5 [other wrong options] [Discuss in forum] 0.5 2.5 3.5 |
Q43 ⇒ Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the all (a), (b) and (c). [other wrong options] [Discuss in forum] sensible heat differences are small, because the temperature changes from tray to tray is small. Trouton's rule is applicable. liquid/vapor loading across the column remains constant. |
Q44 ⇒ Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8"). equal to [other wrong options] [Discuss in forum] half three fourth 1.5 times |
Q45 ⇒ Which of the following material is seldom used for pressure vessel construction ? Rimmed still [other wrong options] [Discuss in forum] Mild steel Killed steel Semi-killed steel |
Q46 ⇒ Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column. Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features. [other wrong options] [Discuss in forum] Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range. |
Q47 ⇒ 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. 8 [other wrong options] [Discuss in forum] 2 42737 4 |
Q48 ⇒ Two iron pipes of the same nominal diameter but different schedule numbers will have the same inside diameter [other wrong options] [Discuss in forum] outside diameter wall thickness none of these |
Q49 ⇒ __________ tray arrangement is recommended for distillation column having diameter upto 4 ft. Cross flow [other wrong options] [Discuss in forum] Radial flow Split flow Cascade |
Q50 ⇒ In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm. 42866 [other wrong options] [Discuss in forum] 42799 42962 43087 |
Q51 ⇒ Pick out the wrong statement pertaining to the design of a basket type evaporator. It is used for high viscosity liquor having large rate of scaling. [other wrong options] [Discuss in forum] The tube bundle is suspended on bracket. There is no central downtake. Downtake is formed by the annular space between the bundle and the shell. |
Q52 ⇒ Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure ? At the inner surface. [other wrong options] [Discuss in forum] At the mid thickness of the cylindrical wall. At the outer surface. None of these. |
Q53 ⇒ 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 central dished section and corner torus section. [other wrong options] [Discuss in forum] corner torus section and central dished section. central dished section and straight flange section. straight flange section and corner torus section. |
Q54 ⇒ Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent. 20 [other wrong options] [Discuss in forum] 5 35 55 |
Q55 ⇒ In a shell and tube heat exchanger, tube side __________ of the mass velocity. both 'a' & 'b' [other wrong options] [Discuss in forum] heat transfer co-efficient is proportional to 0.8th power pressure drop is proportional to the square neither 'a' nor 'b' |
Q56 ⇒ The main purpose of providing stepping on the trays is to facilitate handling of large flow rate of liquid. [other wrong options] [Discuss in forum] increase the residence time. decrease the pressure drop. improve the flow condition. |
Q57 ⇒ An underdesigned steam trap will back up condensate and cause water hammer in steam line. [other wrong options] [Discuss in forum] waste steam. destroy itself of acceleration wear due to rapid recycling. none of these. |
Q58 ⇒ A stuffing box is used for prevention of fluid leakage around moving parts. [other wrong options] [Discuss in forum] absorbing the contraction/expansion of pipeline due to temperature changes. facilitating smooth opening and closing of a valve. reducing the resistance of fluid flow. |
Q59 ⇒ Spherical shaped pressure vessel is considered to be the most ideal, because it can withstand higher pressure for a given metallic shell thickness. [other wrong options] [Discuss in forum] be fabricated very easily. be designed without wind load considerations. be supported very easily. |
Q60 ⇒ The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute. 15 to 30 [other wrong options] [Discuss in forum] 5 to 10 40 to 50 55 to 75 |
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