MCQOPTIONS
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MCQOPTIONS
This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Leiden-frost expansion is related to |
| A. | Condensation of vapor on a cold surface |
| B. | Exchange of heat between two solids |
| C. | Evaporation of a solution |
| D. | Boiling of liquid on a hot surface |
| Answer» E. | |
| 2. |
Heat flux increases with temperature excess beyond the Leiden-frost point due to |
| A. | Radiation effect becomes predominant |
| B. | Occurrence of subcooled boiling |
| C. | Vapor space become large |
| D. | Promotion of nucleate boiling |
| Answer» B. Occurrence of subcooled boiling | |
| 3. |
The excess temperature range 50 degree Celsius < d t < 200 degree Celsius is indicative of the region of |
| A. | Interface evaporation |
| B. | Nuclear boiling |
| C. | Partial film boiling |
| D. | Stable film boiling |
| Answer» D. Stable film boiling | |
| 4. |
The bubble diameter at the time of detachment from the surface can be worked out from the relation proposed by Fritz and is given by |
| A. | C <sub>d </sub> [2 /g (p <sub>t </sub> p <sub>v</sub>)]. |
| B. | C <sub>d </sub> [2 /g (p <sub>t </sub> p <sub>v</sub>)] <sup>3/2</sup> |
| C. | C <sub>d </sub> [2 /g (p <sub>t </sub> p <sub>v</sub>)] <sup>1/2<strong></strong></sup> |
| D. | C <sub>d </sub> [2 /g (p <sub>t </sub> p <sub>v</sub>)] <sup>5/2</sup> |
| Answer» D. C <sub>d </sub> [2 /g (p <sub>t </sub> p <sub>v</sub>)] <sup>5/2</sup> | |