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. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (both with viscosity 2.5 10-5Pa-s), we desire to have their flow rates as 15 Kg/s and 21 Kg/s respectively. What is the Friction Factor (F) for this setup for the annulus pipe? |
| 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 annulus tube, 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. | ( frac{4 (D_{oi}^2 D_{io}^2) frac{ }{4}}{ (D_{io}+D_{oi})} ) |
| 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})} ) | |
| 3. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and outer tube of inner diameter 30mm. We have two fluids A & B, both of density 990 Kg/m3, we desire to have their flow rates as 15m/s and 21m/s respectively, friction factor of 0.0096 and 5 hairpins of length 0.4 metre. If the maximum pressure drop allowed is 10psi, 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. |
What is the Pressure drop equivalent for 7 Hairpins? |
| A. | 5 ( frac{v^2}{2} ) |
| B. | 7 ( frac{v^2}{2} ) |
| C. | 5 ( frac{v^2}{2} ) |
| D. | 7 ( frac{v^2}{2} ) |
| Answer» C. 5 ( frac{v^2}{2} ) | |
| 5. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and outer tube of inner diameter 30mm. We have two fluids A & B, both of density 990 Kg/m3, we desire to have their flow rates as 15m/s and 21m/s respectively, friction factor of 0.00096 and 5 hairpins of length 0.4 metre. What is the value of Pressure drop for the inner tube? |
| A. | 6atm |
| B. | 2atm |
| C. | 5atm |
| D. | 4atm |
| Answer» B. 2atm | |
| 6. |
When we calculate the pressure drop P = ( frac{XFL}{D} frac{v^2}{2g} ) , what is the value X? |
| A. | 2 |
| B. | 4 |
| C. | 5 |
| D. | 8 |
| Answer» C. 5 | |
| 7. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of Outer diameter 20mm(thickness 2mm) and outer tube of inner diameter 30mm. We have two fluids A & B, both of density 990 Kg/m3, we desire to have their flow rates as 15m/s and 21 m/s respectively, friction factor of 0.00096 and length of the tube as 1metre. What is the value of Pressure drop for the inner tube? |
| A. | 25 KPa |
| B. | 20 KPa |
| C. | 27 KPa |
| D. | 35 KPa |
| Answer» D. 35 KPa | |
| 8. |
In the calculation of Friction Factor on the annulus/tube side for heat transferred, which is the correct formula for Friction Factor? |
| 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. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of Outer diameter 20mm (thickness 2mm) and outer tube of inner diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15 m/s and 21 m/s respectively, friction factor of 0.0096 and length of the tube as 1metre. What is the value of hfs for the inner tube? |
| A. | 27.6m |
| B. | 15m |
| C. | 21.12m |
| D. | 22m |
| Answer» B. 15m | |
| 10. |
How many times do we calculate pressure drop for a double pipe heat exchanger? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 11. |
Which of the following has the maximum Pressure Drop for a Heat Exchanger? |
| A. | Counter-flow |
| B. | Parallel Flow |
| C. | Hairpins arrangement |
| D. | Split Flow |
| Answer» D. Split Flow | |
| 12. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (both with viscosity 2.5 10-5Pa-s), we desire to have their flow rates as 15Kg/s and 21Kg/s respectively. What is the Friction Factor (F) for this setup for the inner pipe? |
| A. | 0.0086 |
| B. | 0.086 |
| C. | 0.0068 |
| D. | 0.068 |
| Answer» B. 0.086 | |
| 13. |
If the pressure drop for an operation is more than the pressure assigned to the equipment, then the equipment is perfect to be used for that operation. |
| A. | True |
| B. | False |
| Answer» C. | |