০০। for 90° elbow (medium radius) and 90°square elbow would be respectively around
ক) 25 and 60
খ) 3 and 5
গ) 100 and 250
ঘ) 250 and 600
০১। for a Tee (used as elbow, entering branch) would be
ক) less than that for Tee (used as elbow, entering run).
খ) more than that for Tee (used as elbow, entering run).
গ) around 90.
ঘ) both (b) and (c).
০২। for a Tee (used as elbow, entering run) would be around
ক) 5
খ) 60
গ) 200
ঘ) 350
০৩। for couplings and unions would be
ক) 60
খ) 200
গ) 350
ঘ) negligible
০৪। for fully open gate valves would be
ক) much more than that for fully open globe valves.
খ) much less (say 2% than that for fully open globe valves).
গ) around 7.
ঘ) both (b) and (c).
০৫। for fully open globe value may be around
ক) 10
খ) 25
গ) 75
ঘ) 300
০৬। "A claming section" before the liquid flows into the downcomer is privided to
ক) permit release of entrained vapour in the liquid.
খ) reduce the discharge fluctuation.
গ) ensure better vapour-liquid contact.
ঘ) cool the liquid before it flows down.
০৭। 1.2 to 3.8 cms is the value of the
ক) downcomer liquid seal in case of a balanced tray design.
খ) static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.).
গ) skirt clearance for bubble caps.
ঘ) all (a), (b) and (c).
০৮। 25 per cent cut segmental baffle means that the baffle
ক) height is 75% of the I.D. of the shell.
খ) height is 25% of the I.D. of the shell.
গ) spacing is 75% of its height.
ঘ) width is 25% of its height.
০৯। A 'rupture disc' is provided in chemical equipments as an accessory meant for
ক) relieving excess pressure.
খ) creating turbulence.
গ) enhancing mixing rate.
ঘ) avoiding vortex formation.
১০। A binary liquid azeotropic mixture has boiling point higher than either of the components, when it shows __________ deviation from Raoult's Law.
ক) positive
খ) negative
গ) no
ঘ) none of these
১১। A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult's Law.
ক) positive
খ) negative
গ) no
ঘ) none of these
১২। 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
ক) only if the opening is on spherical vessel.
খ) only if the opening is on a vertical cylinderical vessel.
গ) only if the opening is on a horizontal cylinderical vessel.
ঘ) irrespective of the shape of the vessel.
১৩। A cylinderical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to
ক) 5 mm
খ) 6 mm
গ) 8 mm
ঘ) 10 mm
১৪। A cylindrical storage tank can have a self supported conical roof,
ক) if its diameter is less than 15-20metres.
খ) if its diameter is more than 50 meters.
গ) if the thickness of the roof is more than that of the cylindrical shell.
ঘ) irrespective of its diameter.
১৫। A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator
ক) is economical in operation.
খ) employs high velocity, high heat transfer rate and less heating surface requirement.
গ) employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle.
ঘ) both (b) & (c).
১৬। 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
ক) central dished section and corner torus section.
খ) corner torus section and central dished section.
গ) central dished section and straight flange section.
ঘ) straight flange section and corner torus section.
১৭। A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
ক) 45
খ) 60
গ) 80
ঘ) 95
১৮। A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.
ক) 19
খ) 38
গ) 76
ঘ) 95
১৯। A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by
for 90° elbow (medium radius) and 90°square elbow would be respectively around