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. |
What is the unit of Fouling factor (Rf) in F.P.S system? |
| A. | Btu/hr ft<sup>2</sup> |
| B. | Btu/hr |
| C. | Btu/hr P |
| D. | Btu/hr P<sup>2</sup> |
| Answer» D. Btu/hr P<sup>2</sup> | |
| 2. |
What is the value of Prandtl number if the value of Nusselt number is 496 and Reynolds number is 120000? |
| A. | 4.67 |
| B. | 5.67 |
| C. | 4 |
| D. | 7.3 |
| Answer» B. 5.67 | |
| 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. What is the overall heat transfer coefficient if the convective heat transfer coefficient for annulus side is 496 W/m2K and for the inner tube is 530 W/m2K? |
| A. | 228.6 W/m<sup>2</sup>K |
| B. | 220 W/m<sup>2</sup>K |
| C. | 256.2 W/m<sup>2</sup>K |
| D. | 212 W/m<sup>2</sup>K |
| Answer» B. 220 W/m<sup>2</sup>K | |
| 4. |
To calculate the efficiency of a double pipe heat exchanger, the formula is
|
| A. | Clean tube rate of heat transfer |
| B. | Experimental rate of heat transfer |
| C. | Actual rate of heat transfer |
| D. | Minimum rate of heat transfer |
| Answer» D. Minimum rate of heat transfer | |
| 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, we desire to have their flow rates as 15 Kg/s and 21 Kg/s respectively. Calculate the convective heat transfer coefficient from tube to annulus side. (Given Nusselt number on tube side = 496 and K = 15W/mK) |
| A. | 2067 W/m<sup>2</sup>K |
| B. | 1653 W/m<sup>2</sup>K |
| C. | 1623 W/m<sup>2</sup>K |
| D. | 1673 W/m<sup>2</sup>K |
| Answer» C. 1623 W/m<sup>2</sup>K | |
| 6. |
When we calculate the overall heat transfer coefficient U= ( frac{X ho}{X+ho} ), what is the value X? |
| A. | hi, heat transfer coefficient for inner tube for inner side |
| B. | hio, heat transfer coefficient for inner tube for outer side |
| C. | hoi, heat transfer coefficient for annulus for inner side |
| D. | ho, heat transfer coefficient for annulus side |
| Answer» C. hoi, heat transfer coefficient for annulus for inner side | |
| 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, we desire to have their flow rates as 15Kg/s and 21Kg/s respectively. Calculate the equivalent diameter dor the calculation of convective heat transfer coefficient for the ANNULUS side |
| A. | 10mm |
| B. | 20mm |
| C. | 25mm |
| D. | 35mm |
| Answer» D. 35mm | |
| 8. |
In the calculation of Heat Transfer Coefficient on the annulus side for heat transferred to the inner 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» B. ( frac{4 (D_{io}^2 D_{oi}^2) frac{ }{4}}{ (D_{io})} ) | |
| 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 15Kg/s and 21Kg/s respectively. What is the value of Hydraulic diameter for the annulus tube? |
| A. | 20mm |
| B. | 15mm |
| C. | 25mm |
| D. | 10mm |
| Answer» E. | |
| 10. |
How many times do we calculate effective diameter/hydraulic diameter for a double pipe heat exchanger? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 11. |
Which of the following has the maximum Heat transfer rate for a Double Pipe Heat Exchanger? |
| A. | Counter-flow |
| B. | Parallel Flow |
| C. | Cross Flow |
| D. | Split Flow |
| Answer» B. Parallel 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 15 Kg/s and 21 Kg/s respectively. What is the Reynolds number for this setup for the inner pipe? |
| A. | 12000 |
| B. | 13000 |
| C. | 15000 |
| D. | 14000 |
| Answer» B. 13000 | |
| 13. |
For the calculation of Reynolds number in annulus side, we simply take the difference of the radius of the two tubes. |
| A. | True |
| B. | False |
| Answer» B. False | |