MCQOPTIONS
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MCQOPTIONS
This section includes 12 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 expression for Reynolds number for the falling film in a condsenser? |
| A. | Re= ( frac{4 ddot{M}}{ rho u} ) |
| B. | Re= ( frac{4 ddot{M}}{ rho} ) |
| C. | Re= ( frac{4}{ rho u} ) |
| D. | Re= ( frac{ ddot{M}}{ rho u} ) |
| Answer» B. Re= ( frac{4 ddot{M}}{ rho} ) | |
| 2. |
What is the expression for total steam condensate rate? |
| A. | M = V / h<sub>fg</sub> |
| B. | M = h<sub>fg</sub>/V |
| C. | M = V / h<sub>avg</sub> |
| D. | M = V A |
| Answer» E. | |
| 3. |
What is the expression for total heat transferred in a condenser of length L and diameter D? |
| A. | h<sub>avg</sub> A T<sub>sat-L</sub> |
| B. | h<sub>avg</sub> A T<sub>LMTD</sub> |
| C. | h<sub>X</sub> A T<sub>sat-L</sub> |
| D. | h<sub>X</sub> A T<sub>LMTD</sub> |
| Answer» B. h<sub>avg</sub> A T<sub>LMTD</sub> | |
| 4. |
What is the expression for mean flow velocity of the film fluid in a vertical condenser? |
| A. | v = g / 3 |
| B. | v = g <sup>2</sup> / |
| C. | v = g <sup>2</sup> / 3 |
| D. | v = g <sup>2</sup> / 3 |
| Answer» E. | |
| 5. |
A 0.5m square plate is to be used to condense dry saturated steam at 0.08bar, if the wall surface is to be maintained at 18.5 , calculate the mean mass flow at a distance of 25cm.
|
| A. | 0.135 Kg/hr |
| B. | 22.39 Kg/hr |
| C. | 0.135 kg/sec |
| D. | 22.39 kg/s |
| Answer» E. | |
| 6. |
A 0.5m square plate is to be used to condense dry saturated steam at 0.08bar, if the wall surface is to be maintained at 18.5 , calculate the mean flow velocity at a distance of 25cm.
|
| A. | 0.09 m/s |
| B. | 0.9 m/s |
| C. | 0.6m/s |
| D. | 169.6m/s |
| Answer» B. 0.9 m/s | |
| 7. |
What is the value of havg of a condenser at a distance of 25cm if a 0.5m square plate is to be used to condense dry saturated steam at 0.08bar, if the wall surface is to be maintained at 18.5 ?
|
| A. | 50 105 J/m<sup>2</sup>K |
| B. | 10 105 J/m<sup>2</sup>K |
| C. | 350 105 J/m<sup>2</sup>K |
| D. | 26 x105 J/m<sup>2</sup>K |
| Answer» E. | |
| 8. |
A 0.5m square plate is to be used to condense dry saturated steam at 0.08bar, if the wall surface is to be maintained at 18.5 , calculate the Convective heat transfer coefficient h at a distance of 25cm.
|
| A. | 160 10<sup>5</sup> J/m<sup>2</sup>K |
| B. | 3.5 10<sup>5</sup> J/m<sup>2</sup>K |
| C. | 450 10<sup>5</sup> J/m<sup>2</sup>K |
| D. | 150 10<sup>5</sup> J/m<sup>2</sup>K |
| Answer» C. 450 10<sup>5</sup> J/m<sup>2</sup>K | |
| 9. |
A 0.5m square plate is to be used to condense dry saturated steam at 0.08bar, if the wall surface is to be maintained at 18.5 , calculate the film thickness at a distance of 25cm.
|
| A. | 0.0364 m |
| B. | 0.024 m |
| C. | 0.0046 m |
| D. | 0.0056 m |
| Answer» B. 0.024 m | |
| 10. |
When do we apply the Kirkbride equation for determination of heat transfer coefficient in a condenser?
|
| A. | Re < 1800 |
| B. | Re > 1800 |
| C. | Re < 1000 |
| D. | Re < 18000 |
| Answer» C. Re < 1000 | |
| 11. |
If the Reynolds Number is more than 1800, then what is the equation for the heat transfer coefficient of the condenser? |
| A. | h=0.0077 Re<sup>0.4</sup>[K<sup>3</sup> <sup>2</sup>g <sup>2</sup>]<sup>1/3</sup> |
| B. | h=0.0077 Re<sup>0.4</sup>[K<sup>3</sup> <sup>2</sup>g <sup>2</sup>]<sup>1/4</sup> |
| C. | h=0.0077 Re<sup>0.4</sup>[K<sup>4</sup> <sup>2</sup>g <sup>2</sup>]<sup>1/3</sup> |
| D. | h=0.0077 Re<sup>0.4</sup>[K<sup>3</sup> <sup>3</sup>g <sup>2</sup>]<sup>1/3</sup> |
| Answer» B. h=0.0077 Re<sup>0.4</sup>[K<sup>3</sup> <sup>2</sup>g <sup>2</sup>]<sup>1/4</sup> | |
| 12. |
For the given equation of heat transfer coefficient, which one of the following condition should hold true?
|
| A. | Re < 1800 |
| B. | Re > 1800 |
| C. | Re < 1000 |
| D. | Re < 18000 |
| Answer» B. Re > 1800 | |