MCQOPTIONS
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MCQOPTIONS
This section includes 324 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________? |
| A. | An increase in liquid viscosity |
| B. | An increase in relative volatility for rectification columns |
| C. | Decrease in gas solubility for absorbers |
| D. | All A., B. and C. |
| Answer» E. | |
| 302. |
An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________? |
| A. | Drain the liquid from the tray when the unit is not in operation |
| B. | Allow for thermal expansion and facilitate installation |
| C. | Avoid back-trapping |
| D. | None of these |
| Answer» C. Avoid back-trapping | |
| 303. |
Accidents in chemical plants are mostly due to___________________? |
| A. | Inadequate equipment design |
| B. | Faulty operating procedures |
| C. | Improper layout of the equipments |
| D. | Failure of equipments |
| Answer» C. Improper layout of the equipments | |
| 304. |
A/an _______________ is used for changing the direction of a pipeline? |
| A. | Elbow |
| B. | Union |
| C. | Flange |
| D. | Disc compensator |
| Answer» B. Union | |
| 305. |
A stuffing box is used for____________________? |
| A. | Absorbing the contraction/expansion of pipeline due to temperature changes |
| B. | Prevention of fluid leakage around moving parts |
| C. | Facilitating smooth opening and closing of a valve |
| D. | Reducing the resistance of fluid flow |
| Answer» C. Facilitating smooth opening and closing of a valve | |
| 306. |
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________? |
| A. | 2 |
| B. | 20.8 |
| C. | 20.2 |
| D. | None of these |
| Answer» C. 20.2 | |
| 307. |
A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is________________? |
| A. | Bending |
| B. | Deformation |
| C. | Shear |
| D. | Elongation |
| Answer» B. Deformation | |
| 308. |
A ‘rupture disc’ is provided in chemical equipments as an accessory meant for ___________________? |
| A. | Relieving excess pressure |
| B. | Creating turbulence |
| C. | Enhancing mixing rate |
| D. | Avoiding vortex formation |
| Answer» B. Creating turbulence | |
| 309. |
A riveted joint does not fail by _____________________ of rivets? |
| A. | Tearing |
| B. | Shearing |
| C. | Tearing of the plate across a row |
| D. | None of these |
| Answer» E. | |
| 310. |
A pressure vessel is said to be made of ‘thick’ shell, if the ratio of its diameter to wall thickness is_______________? |
| A. | < 10 |
| B. | > 10 |
| C. | > 20 |
| D. | < 20 |
| Answer» C. > 20 | |
| 311. |
A pipe is generally made of circular cross-section, because a circular cross-section has the____________________? |
| A. | Higher structural strength |
| B. | Lowest surface area requirement for a given volume |
| C. | Both A. & B. |
| D. | None of these |
| Answer» D. None of these | |
| 312. |
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_______________? |
| A. | (ph – dh)/ph |
| B. | (ph – dh . dt/2)/ph |
| C. | (ph – dt)/ph |
| D. | (ph – dh)/dh |
| Answer» D. (ph – dh)/dh | |
| 313. |
A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap? |
| A. | 19 |
| B. | 38 |
| C. | 67 |
| D. | 95 |
| Answer» C. 67 | |
| 314. |
A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity? |
| A. | 45 |
| B. | 60 |
| C. | 80 |
| D. | 95 |
| Answer» D. 95 | |
| 315. |
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__________________? |
| A. | Central dished section and corner torus section |
| B. | Corner torus section and central dished section |
| C. | Central dished section and straight flange section |
| D. | Straight flange section and corner torus section |
| Answer» B. Corner torus section and central dished section | |
| 316. |
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator__________________? |
| A. | Is economical in operation |
| B. | Employs high velocity, high heat transfer rate and less heating surface requirement |
| C. | Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle |
| D. | Both B. & C. |
| Answer» E. | |
| 317. |
A cylindrical storage tank can have a self supported conical roof ? |
| A. | If its diameter is less than 15-20metres |
| B. | If its diameter is more than 50 meters |
| C. | If the thickness of the roof is more than that of the cylindrical shell |
| D. | Irrespective of its diameter |
| Answer» B. If its diameter is more than 50 meters | |
| 318. |
A cylindrical 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________________? |
| A. | 5 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 10 mm |
| Answer» E. | |
| 319. |
“A claming section” before the liquid flows into the downcomer is provided to__________________? |
| A. | Permit release of entrained vapour in the liquid |
| B. | Reduce the discharge fluctuation |
| C. | Ensure better vapour-liquid contact |
| D. | Cool the liquid before it flows down |
| Answer» B. Reduce the discharge fluctuation | |
| 320. |
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 cylindrical vessel |
| C. | Only if the opening is on a horizontal cylindrical vessel |
| D. | Irrespective of the shape of the vessel |
| Answer» E. | |
| 321. |
A binary liquid Azeotropic mixture has boiling point lower than either of the components, when it shows _____________ deviation from Raoult’s Law? |
| A. | Positive |
| B. | Negative |
| C. | No |
| D. | None of these |
| Answer» B. Negative | |
| 322. |
A binary liquid Azeotropic mixture has boiling point higher than either of the components, when it shows ______________ deviation from Raoult’s Law? |
| A. | Positive |
| B. | Negative |
| C. | No |
| D. | None of these |
| Answer» C. No | |
| 323. |
25 per cent cut segmental baffle means that the baffle__________________? |
| A. | Height is 75% of the I.D. of the shell |
| B. | Height is 25% of the I.D. of the shell |
| C. | Spacing is 75% of its height |
| D. | Width is 25% of its height |
| Answer» B. Height is 25% of the I.D. of the shell | |
| 324. |
1.2 to 3.8 cms is the value of the ______________________? |
| A. | Downcomer liquid seal in case of a balanced tray design |
| B. | Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm) |
| C. | Skirt clearance for bubble caps |
| D. | All A., B. and C. |
| Answer» E. | |