MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
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 correct representation of the bubble when it is about to depart is best represented by the diagram- |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8a.png"><img alt="The representation of bubble when it is about to depart is seen in diagram - option a" class="alignnone size-full wp-image-248205" height="127" sizes="(max-width: 345px) 100vw, 345px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8a.png 345w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8a-300x110.png 300w" width="345"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b.png"><img alt="The representation of bubble when it is about to depart is seen in diagram - option b" class="alignnone size-full wp-image-248206" height="127" sizes="(max-width: 370px) 100vw, 370px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b.png 370w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b-300x103.png 300w" width="370"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8c.png"><img alt="The representation of bubble when it is about to depart is seen in diagram - option c" class="alignnone size-full wp-image-248207" height="118" sizes="(max-width: 372px) 100vw, 372px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8c.png 372w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8c-300x95.png 300w" width="372"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8d.png"><img alt="The representation of bubble when it is about to depart is seen in diagram - option d" class="alignnone size-full wp-image-248208" height="151" sizes="(max-width: 375px) 100vw, 375px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8d.png 375w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8d-300x121.png 300w" width="375"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b.png"><img alt="The representation of bubble when it is about to depart is seen in diagram - option b" class="alignnone size-full wp-image-248206" height="127" sizes="(max-width: 370px) 100vw, 370px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b.png 370w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-boiling-curve-properties-q8b-300x103.png 300w" width="370"/></a> | |
| 9. |
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 | |
| 10. |
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 | |
| 11. |
What is the significance of the term in the given Fritz Equation used to calculate bubble departure diameter?
|
| A. | Surface Tension |
| B. | Contact Angle |
| C. | Liquid density |
| D. | Gas density |
| Answer» B. Contact Angle | |
| 12. |
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 = C<sub>d</sub> [2 /g (p<sub>t</sub> p<sub>v</sub>)]<sup> </sup> |
| B. | D = C<sub>d</sub> [ /g (p<sub>t</sub> p<sub>v</sub>)]<sup> </sup> |
| C. | D = C<sub>d</sub> [2 /g (p<sub>t</sub> p<sub>v</sub>)]<sup>2</sup> |
| D. | D = C<sub>d</sub> [2 /g (p<sub>t</sub> p<sub>v</sub>)] |
| Answer» B. D = C<sub>d</sub> [ /g (p<sub>t</sub> p<sub>v</sub>)]<sup> </sup> | |
| 13. |
The Fritz equation to calculate the bubble diameter is given by
|
| A. | nWhat is the value of the constant Cd for water bubbles at 1atm? |
| B. | 0.0148 |
| C. | 0.003 |
| D. | 0.0027 |
| E. | 0.00148 |
| Answer» B. 0.0148 | |
| 14. |
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 | |
| 15. |
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 | |