MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Operations knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If there are N shell passes in a shell and tube HE, then which one of the following relation is correct foe the pressure drop a shell side? |
| A. | (( frac{FL}{D}+4 N) frac{v^2 }{2} ) |
| B. | (( frac{FL}{D}+N) frac{v^2 }{2} ) |
| C. | (( frac{4FL}{D}+N) frac{v^2 }{2} ) |
| D. | (( frac{4FL}{D}+4 N) frac{v^2 }{2} ) |
| Answer» B. (( frac{FL}{D}+N) frac{v^2 }{2} ) | |
| 2. |
Consider we have a shell and tube Heat Exchanger, with the inner tube of diameter 30mm (neglect thickness) and shell of diameter 100mm. We have two fluids A & B (both with viscosity 2.5 10-5Pa-s), we desire to have their flow rates as 4 Kg/s(tube) and 5.3 Kg/s(shell) respectively. What is the Friction Factor (F) for this setup for the shell if it has triangular pitch with Pitch = 40mm? |
| A. | 0.0086 |
| B. | 0.0103 |
| C. | 0.086 |
| D. | 0.00103 |
| Answer» C. 0.086 | |
| 3. |
In the calculation of Reynold s Number for the Friction factor of the shell, which is the correct formula for equivalent diameter De? |
| A. | ( frac{4 (D_{oi}^2 D_{io}^2) frac{ }{4}}{ (D_{io})} ) |
| B. | ( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io})} ) |
| C. | Depends on the pitch |
| D. | ( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io}+D_{oi})} ) |
| Answer» D. ( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io}+D_{oi})} ) | |
| 4. |
Consider we have a 2-4Shell and Tube Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and shell of inner diameter 100mm. We have two fluids A & B, both of density 990 Kg/m3, we desire to have their flow rates as 15 m/s and 21 m/s respectively, friction factor of 0.00096 and 4 tube of length 0.4 m and 2shell passes. If the maximum pressure drop allowed on shell side is 10atm, is the setup suitable for industrial use? |
| A. | No, since pressure drop is less than specified |
| B. | Yes, since pressure drop is less than specified |
| C. | No, since pressure drop is more than specified |
| D. | Yes, since pressure drop is more than specified |
| Answer» D. Yes, since pressure drop is more than specified | |
| 5. |
What is the Pressure drop equivalent for 7 tube passes? |
| A. | 50 ( frac{v^2}{2} ) |
| B. | 28 ( frac{v^2}{2} ) |
| C. | 20 ( frac{v^2}{2} ) |
| D. | 7 ( frac{v^2}{2} ) |
| Answer» C. 20 ( frac{v^2}{2} ) | |
| 6. |
Consider we have a 2-4 Shell and Tube Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and Shell of inner diameter 100mm. We have two fluids A & B, both of density 990 Kg/m3, we desire to have their flow rates as 15 m/s(tube) and 21 m/s(shell) respectively, friction factor of 0.00096 and 2 tubes of length 0.4 m. What is the value of Pressure drop for the inner tube due to frictional losses? |
| A. | 10.67KPa |
| B. | 20KPa |
| C. | 25KPa |
| D. | 24KPa |
| Answer» B. 20KPa | |
| 7. |
Consider we have a 2-4 Shell and Tube Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and shell of inner diameter 100mm. We have two fluids A & B, both of density 990 Kg/m3, we desire to have their flow rates as 15m/s(tube) and 21 m/s(shell) respectively, friction factor of 0.00096 and length of the tube as 1m. What is the value of Frictional Head Loss for the inner tube? |
| A. | 24.6 m |
| B. | 27.6 m |
| C. | 2.76 m |
| D. | 2.46 m |
| Answer» D. 2.46 m | |
| 8. |
For the calculation of Friction Factor on the Shell side, which one of the following is the correct formula? |
| A. | F = 0.0035+ ( frac{0.264}{Re^{0.42}} ) |
| B. | F = 0.0027+ ( frac{0.264}{Re^{0.42}} ) |
| C. | F = 0.0035+ ( frac{0.42}{Re^{0.264}} ) |
| D. | F = 0.0027+ ( frac{0.42}{Re^{0.264}} ) |
| Answer» B. F = 0.0027+ ( frac{0.264}{Re^{0.42}} ) | |
| 9. |
If we desire to use a fluid with high pressure operation, we prefer to keep it in the tube side. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
We have a fluid of dirt factor 0.00035 which we want to use in our operation. During design calculations we find the dirt factor to be less than that of the fluid, we pass the setup for industrial use. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
We have a fluid of dirt factor 0.0035 which we want to use in our operation. Then during design considerations, we find that for our design the dirt factor is not applicable, this value of the dirt factor can be ________ |
| A. | 0.00035 |
| B. | 0.0035 |
| C. | 0.0045 |
| D. | 0.0055 |
| Answer» B. 0.0035 | |
| 12. |
Our design dirt factor should be _____ the provided threshold dirt factor. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | Much less than |
| Answer» C. Equal to | |
| 13. |
If UD = Overall Dirt Heat Transfer coefficient and Uc = Overall Clean Heat Transfer coefficient, then which of the following relation is correct? |
| A. | U<sub>D</sub> > U<sub>c</sub> |
| B. | U<sub>D</sub> < U<sub>c</sub> |
| C. | U<sub>D</sub> = U<sub>c</sub> |
| D. | U<sub>D</sub> >> U<sub>c</sub> |
| Answer» C. U<sub>D</sub> = U<sub>c</sub> | |