MCQOPTIONS
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MCQOPTIONS
This section includes 908 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
_In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is$? |
| A. | Called tube pitch |
| B. | Called tube clearance |
| C. | Always less than the diameter of the tube |
| D. | None of these |
| Answer» B. Called tube clearance | |
| 452. |
_In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is$? |
| A. | < 10 |
| B. | > 10 |
| C. | > 20 |
| D. | 30 |
| Answer» C. > 20 | |
| 453. |
_A rivetted joint does not fail by __________ of rivets.$? |
| A. | Tearing |
| B. | Shearing |
| C. | Tearing of the plate across a row |
| D. | None of these |
| Answer» E. | |
| 454. |
_The ratio of lateral strain to linear strain is termed as the$? |
| A. | Poisson's ratio |
| B. | Bulk modulus |
| C. | Modulus of elasticity |
| D. | Shear modulus |
| Answer» B. Bulk modulus | |
| 455. |
_Weep holes provided in the plates of a distillation column$? |
| A. | Facilitate draining out liquid from a tray when the unit is not in operation |
| B. | Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid |
| C. | Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation |
| D. | All of the above |
| Answer» E. | |
| 456. |
_With increase in gas flow rate to fabric surface area ratio (Nm³/hr/m² fabric surface area), the size & the cost of a bag filter$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | None of these |
| Answer» C. Remain unaffected | |
| 457. |
_The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.$? |
| A. | 6 |
| B. | 18 |
| C. | 24 |
| D. | 34 |
| Answer» B. 18 | |
| 458. |
_In perforated plate towers, the$? |
| A. | Hole sizes may be around 1/8" or 3/16" |
| B. | Total hole area may be around 6 to 15% of tower cross-sectional area |
| C. | Pressure drop is less compared is similar bubble cap towers |
| D. | All of the above |
| Answer» E. | |
| 459. |
_The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.$? |
| A. | 0.1-0.2 |
| B. | 0.2-0.5 |
| C. | 0.4-0.9 |
| D. | 1.2-1.5 |
| Answer» D. 1.2-1.5 | |
| 460. |
_Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.$? |
| A. | 10 |
| B. | 50 |
| C. | 100 |
| D. | 150 |
| Answer» D. 150 | |
| 461. |
_Optimum economic pipe diameter for fluid flow is determined by the$? |
| A. | Viscosity of the fluid |
| B. | Density of the fluid |
| C. | Total cost considerations (pumping cost plus fixed cost of the pipe) |
| D. | None of these |
| Answer» D. None of these | |
| 462. |
_Value of Peclet number = 0, is the representative of$? |
| A. | Laminar flow |
| B. | Complete back mixing |
| C. | Plug flow |
| D. | Eddy diffusivity = 0 |
| Answer» C. Plug flow | |
| 463. |
An adequate clearance between the tray and the shell wall of a distillation column is provided to$? |
| A. | Drain the liquid from the tray when the unit is not in operation |
| B. | Allow for thermal expansion and facilitate installation |
| C. | Avoid back-trapping |
| D. | None of these |
| Answer» C. Avoid back-trapping | |
| 464. |
For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.$? |
| A. | Half |
| B. | Twice |
| C. | Thrice |
| D. | Five times |
| Answer» D. Five times | |
| 465. |
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D‚ÇÅ and D‚ÇÇ are I.D. of inner and outer pipes)$? |
| A. | (D₂² - D₁²)/D₁² |
| B. | D‚ÇÇ - D‚ÇÅ |
| C. | (D₂² - D₁²)/D₂² |
| D. | None of these |
| Answer» B. D‚Äö√á√á - D‚Äö√á√Ö | |
| 466. |
At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.$? |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | Unpredictable |
| Answer» C. Same | |
| 467. |
Spherical shaped pressure vessel is considered to be the most ideal, because it can$? |
| A. | Withstand higher pressure for a given metallic shell thickness |
| B. | Be fabricated very easily |
| C. | Be designed without wind load considerations |
| D. | Be supported very easily |
| Answer» B. Be fabricated very easily | |
| 468. |
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.$? |
| A. | 5-10 |
| B. | 15-20 |
| C. | 30-35 |
| D. | 35-40 |
| Answer» C. 30-35 | |
| 469. |
Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is$? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Cither A or B; depends upon the I.D. of the pipe |
| Answer» C. Same | |
| 470. |
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes$? |
| A. | Are easier to clean |
| B. | Are less prone to fouling |
| C. | Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less |
| D. | None of these |
| Answer» D. None of these | |
| 471. |
Le/D for fully open gate valves would be$? |
| A. | Much more than that for fully open globe valves |
| B. | Much less (say 2% than that for fully open globe valves) |
| C. | Around 7 |
| D. | Both B and C |
| Answer» E. | |
| 472. |
The units of Young's modulus of elasticity and __________ are the same.$? |
| A. | Strain |
| B. | Stress |
| C. | Modular ratio |
| D. | None of these |
| Answer» C. Modular ratio | |
| 473. |
In a heat exchanger, shell side fluid velocity can be changed by changing the tube$? |
| A. | Layout |
| B. | Pitch |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 474. |
The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.$? |
| A. | Shear |
| B. | Tensile |
| C. | Compressive |
| D. | Thermal |
| Answer» E. | |
| 475. |
LMTD correction factor is used in heat exchanger design for$? |
| A. | Double pipe heat exchanger |
| B. | Multipass shell and tube heat exchanger |
| C. | Fouling fluids |
| D. | Counter flow of hot and cold fluids |
| Answer» C. Fouling fluids | |
| 476. |
A pipe is generally made of circular cross-section, because a circular cross-section has the$? |
| 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 | |
| 477. |
In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.$? |
| A. | 2.5 |
| B. | 7.5 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 478. |
The main purpose of providing stepping on the trays is to$? |
| A. | Increase the residence time |
| B. | Decrease the pressure drop |
| C. | Facilitate handling of large flow rate of liquid |
| D. | Improve the flow condition |
| Answer» D. Improve the flow condition | |
| 479. |
In the design of a bag filter, the gas temperature is an important consideration, as it affects the$? |
| A. | Gas density |
| B. | Gas viscosity |
| C. | Fibre selection |
| D. | All of the above |
| Answer» E. | |
| 480. |
The stress developed in a material without any permanent set is called the$? |
| A. | Ultimate stress |
| B. | Yield stress |
| C. | Elastic limit |
| D. | Breaking stress |
| Answer» D. Breaking stress | |
| 481. |
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as$? |
| A. | D² |
| B. | D⁵ |
| C. | D |
| D. | D‚Åπ |
| Answer» C. D | |
| 482. |
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.$? |
| A. | 19 |
| B. | 38 |
| C. | 76 |
| D. | 95 |
| Answer» C. 76 | |
| 483. |
The raio, (properller agitator dia/tank dia) is normally taken as$? |
| A. | 0.15-030 |
| B. | 0.5-0.65 |
| C. | 0.75-0.85 |
| D. | 0.60-0.90 |
| Answer» B. 0.5-0.65 | |
| 484. |
Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.$? |
| A. | 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 |
| B. | 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 |
| C. | Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features |
| D. | 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 |
| Answer» D. 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 | |
| 485. |
If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of$? |
| A. | D/2 or minimum 2" to 5D |
| B. | D/5 or minimum 2" to 5D |
| C. | D/5 or minimum 2" to D |
| D. | None of these |
| Answer» C. D/5 or minimum 2" to D | |
| 486. |
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.$? |
| A. | 2.5 |
| B. | 5 |
| C. | 12.5 |
| D. | 17.5 |
| Answer» C. 12.5 | |
| 487. |
In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter.$? |
| A. | Two |
| B. | Five |
| C. | Ten |
| D. | Twenty |
| Answer» B. Five | |
| 488. |
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around$? |
| A. | 2.5" |
| B. | 0.5" |
| C. | 5" |
| D. | 50% of the plate spacing |
| Answer» C. 5" | |
| 489. |
The LMTD correction factor (FT) is defined as the$? |
| A. | Ratio of true temperature difference to the LMTD |
| B. | Ratio of LMTD to the true temperature difference |
| C. | Differenced of true temperature difference and the LMTD |
| D. | Geometric mean of the true temperature difference and the LMTD |
| Answer» B. Ratio of LMTD to the true temperature difference | |
| 490. |
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )$? |
| A. | 0.2 D |
| B. | 0.5 D |
| C. | 0.66 D |
| D. | 0.80 D |
| Answer» B. 0.5 D | |
| 491. |
The most common standard size of bubble caps used in industrial operation is$? |
| A. | 1" dia cap with 0.5" dia riser |
| B. | 6" dia cap with 4" dia riser |
| C. | 8" dia cap with 1" dia riser |
| D. | 4" dia cap with 8" dia riser |
| Answer» C. 8" dia cap with 1" dia riser | |
| 492. |
Pick out the wrong statement pertaining to a shell and tube heat exchanger.$? |
| A. | The minimum value of baffle spacing is 50 mm |
| B. | The maximum value of baffle spacing is equal to the I.D. of the shell |
| C. | The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these |
| D. | Disk and doughnut baffle is the most commonly used baffle |
| Answer» E. | |
| 493. |
The main purpose of providing stepping on the trays is to? |
| A. | Increase the residence time |
| B. | Decrease the pressure drop |
| C. | Facilitate handling of large flow rate of liquid |
| D. | Improve the flow condition |
| Answer» D. Improve the flow condition | |
| 494. |
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.? |
| A. | 19 |
| B. | 38 |
| C. | 76 |
| D. | 95 |
| Answer» C. 76 | |
| 495. |
In the design of a bag filter, the gas temperature is an important consideration, as it affects the? |
| A. | Gas density |
| B. | Gas viscosity |
| C. | Fibre selection |
| D. | All of the above |
| Answer» E. | |
| 496. |
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as? |
| A. | D² |
| B. | D⁵ |
| C. | D |
| D. | D‚Åπ |
| Answer» C. D | |
| 497. |
The stress developed in a material without any permanent set is called the? |
| A. | Ultimate stress |
| B. | Yield stress |
| C. | Elastic limit |
| D. | Breaking stress |
| Answer» D. Breaking stress | |
| 498. |
In a distillation column, minimum clearance to be maintained betweeen the overflow weir and the last row of the bubble caps is __________ cms.? |
| A. | 2.5 |
| B. | 7.5 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 499. |
LMTD correction factor is used in heat exchanger design for? |
| A. | Double pipe heat exchanger |
| B. | Multipass shell and tube heat exchanger |
| C. | Fouling fluids |
| D. | Counter flow of hot and cold fluids |
| Answer» C. Fouling fluids | |
| 500. |
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 | |