MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 14 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. |
Which one of the following statement is not correct about nucleate boiling? |
| A. | The temperature of the surface is greater than the saturation temperature of the liquid |
| B. | The heat flux is greater than film boiling |
| C. | The temperature is greater than film boiling |
| D. | Bubbles are created by the expansion of entrapped vapour in the heating surface |
| Answer» D. Bubbles are created by the expansion of entrapped vapour in the heating surface | |
| 2. |
The temperature of operation of nucleate boiling is ___________ film boiling. |
| A. | More than |
| B. | Less than |
| C. | Equal to |
| D. | Difficult to be compared than |
| Answer» C. Equal to | |
| 3. |
When the temperature of water is at about 90-100 degrees more than its boiling point, then what is the name of this type of boiling? |
| A. | Nucleate |
| B. | Stable Film boiling |
| C. | Partially stable film boiling |
| D. | Radiation boiling |
| Answer» D. Radiation boiling | |
| 4. |
The Leiden Frost effect is observed in _________ of liquids. |
| A. | Boiling |
| B. | Cooling |
| C. | Freezing |
| D. | Radiation superheating |
| Answer» B. Cooling | |
| 5. |
The increase in heat flux after the Leiden Frost Point is due to ___________ |
| A. | Radiation |
| B. | Convection |
| C. | Conduction |
| D. | Flash |
| Answer» B. Convection | |
| 6. |
Which one of the following correctly represents the axes of the boiling curve? |
| A. | Y: Heat flux and X: Temperature |
| B. | X: Heat transfer coefficient and Y: Temperature |
| C. | X: Heat flux and Y: Temperature |
| D. | Y: Heat flux and X: Temperature difference |
| Answer» B. X: Heat transfer coefficient and Y: Temperature | |
| 7. |
With increase in temperature of boiling operation, the heat transfer flux ___________ |
| A. | Decreases |
| B. | Increases |
| C. | Increases at first, then decreases |
| D. | Increases at first, then decreases and later again increases |
| Answer» E. | |
| 8. |
The size of the bubble on nucleation _________ as it rises up. |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Breaks to many bubbles |
| Answer» B. Decreases | |
| 9. |
The height of the superheated layer in nucleate boiling is __________ the diameter of the departing bubble. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | Much greater than |
| Answer» C. Equal to | |
| 10. |
What is the significance of the term “ σ ” in the given Fritz Equation used to calculate bubble departure diameter?D = Cd β [2 σ/g (PL – PV )]½ |
| A. | Surface Tension |
| B. | Contact Angle |
| C. | Liquid density |
| D. | Gas density |
| Answer» B. Contact Angle | |
| 11. |
Which one of the following is the correct representation of Fritz equation which is used to calculate bubble diameter in bubble pool boiling? |
| A. | D = Cd β [2 σ/g (pt – pv)]½ |
| B. | D = Cd β [σ/g (pt – pv)]½ |
| C. | D = Cd β [2 σ/g (pt – pv)]2 |
| D. | D = Cd β [2 σ/g (pt – pv)] |
| Answer» B. D = Cd β [σ/g (pt – pv)]½ | |
| 12. |
The Fritz equation to calculate the bubble diameter is given by –D = Cd β [2 σ/g (ϸL – ϸV )]½What is the value of the constant Cd for water bubbles at 1atm? |
| A. | 0.0148 |
| B. | 0.003 |
| C. | 0.0027 |
| D. | 0.00148 |
| Answer» B. 0.003 | |
| 13. |
Which one of the following conditions does not influence Nucleate pool boiling? |
| A. | Pressure |
| B. | Liquid properties |
| C. | Heat capacity of fluid |
| D. | Material of heating |
| Answer» D. Material of heating | |
| 14. |
The diameter of the bubble that gets detached from the heating surface during boiling can be found by which one of the following relations? |
| A. | Stanton’s Relation |
| B. | Fritz Relation |
| C. | Fourier Theory |
| D. | Nusselt’s Theory |
| Answer» C. Fourier Theory | |