MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Operations Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
In the calculation of Reynold’s Number for the Friction factor of the shell, which is the correct formula for equivalent diameter De? |
| A. | \(\frac{4×(D_{oi}^2 – D_{io}^2)×\frac{π}{4}}{π(D_{io})}\) |
| B. | \(\frac{4×(D_{io}^2 – D_{oi}^2)×\frac{π}{4}}{π(D_{io})}\) |
| C. | Depends on the pitch |
| D. | \(\frac{4×(D_{io}^2 – D_{oi}^2)×\frac{π}{4}}{π(D_{io}+D_{oi})}\) |
| Answer» D. \(\frac{4×(D_{io}^2 – D_{oi}^2)×\frac{π}{4}}{π(D_{io}+D_{oi})}\) | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
If UD = Overall Dirt Heat Transfer coefficient and Uc = Overall Clean Heat Transfer coefficient, then which of the following relation is correct? |
| A. | UD > Uc |
| B. | UD < Uc |
| C. | UD = Uc |
| D. | UD >> Uc |
| Answer» C. UD = Uc | |