MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
The relations established for the calculation of heat transfer coefficients is applicable for which of the following? |
| A. | Spherical pellets |
| B. | Ring shaped pellets |
| C. | Cylindrical Pellets |
| D. | Any shaped pellet |
| Answer» E. | |
| 2. |
What is the term X in the calculation of Nusselt Number for the wall side?
|
| A. | 0.027 |
| B. | 1.94 |
| C. | 0.0035 |
| D. | 0.023 |
| Answer» C. 0.0035 | |
| 3. |
What is the Nusselt number for the wall side if give Reynolds number = 12000 and Prantl number = 0.47? |
| A. | 165.75 |
| B. | 175.65 |
| C. | 167.65 |
| D. | 165.65 |
| Answer» E. | |
| 4. |
For the Calculation of hwall, identify the correct relation. |
| A. | Sieder Tate Equation |
| B. | h<sub>wall</sub>Dp/Ke=1.94 Re<sup>0.5</sup> Pr<sup>0.33</sup> |
| C. | h<sub>wall</sub>Dp/Kg=1.94 Re<sup>0.5</sup> Pr<sup>0.33</sup> |
| D. | h<sub>wall</sub>Dt/Ke=1.94 Re<sup>0.5</sup> Pr<sup>0.33</sup> |
| Answer» D. h<sub>wall</sub>Dt/Ke=1.94 Re<sup>0.5</sup> Pr<sup>0.33</sup> | |
| 5. |
In the given relation, they Reynolds number is calculated with the ______ and the Prantl Number for the _______
|
| A. | Particle diameter, Gas |
| B. | Gas Void, Particle |
| C. | Particle diameter, Particle |
| D. | Gas Void, Gas |
| Answer» B. Gas Void, Particle | |
| 6. |
The relation between effective thermal conductivity of a packed bed and the thermal conductivity of the gas is? |
| A. | ( frac{Ke}{Kg} )=5+0.1RePr |
| B. | ( frac{Ke}{Kg} )=5 |
| C. | ( frac{Ke}{Kg} )=5+0.1Re |
| D. | ( frac{Ke}{Kg} )=5+0.1RePr<sup>0.33</sup> |
| Answer» B. ( frac{Ke}{Kg} )=5 | |
| 7. |
The effective thermal conductivity of a packed bed is almost ____ the Thermal Conductivity of the gas. |
| A. | Six |
| B. | Five |
| C. | Seven |
| D. | Eight |
| Answer» C. Seven | |
| 8. |
Calculate the heat transfer coefficient of bed if the effective thermal conductivity is 15W/mK and 30mm diameter tube. |
| A. | 4 KW/m<sup>2</sup>K |
| B. | 5 KW/m<sup>2</sup>K |
| C. | 6 KW/m<sup>2</sup>K |
| D. | 7 KW/m<sup>2</sup>K |
| Answer» C. 6 KW/m<sup>2</sup>K | |
| 9. |
What is the term Ke in the expression for hBED?
|
| A. | Effective Thermal Conductivity |
| B. | Gas Thermal Conductivity |
| C. | Pellet s Thermal Conductivity |
| D. | Wall Thermal Conductivity |
| Answer» B. Gas Thermal Conductivity | |
| 10. |
To predict the heat transfer for different particles or different tube size, the heat transfer coefficient can be represented as ( frac{1}{hi} = frac{1}{hwall}+ frac{1}{hbed} ). |
| A. | True |
| B. | False |
| Answer» B. False | |