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. |
A conventional jacket is usually fitted with baffles. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
For a half pipe coil, the equation for Reynolds number is usually the formula_______ |
| A. | Sieder Tate |
| B. | Gnielinski correlation |
| C. | Dittus-Boelter equation |
| D. | Sieder |
| Answer» B. Gnielinski correlation | |
| 3. |
A condensing coefficient in a jacket should be ______ compared to the process side. |
| A. | Extremely High |
| B. | Extremely Low |
| C. | Equal |
| D. | Approximate equal |
| Answer» B. Extremely Low | |
| 4. |
For conventional unbaffled jacket, what is the term X in the expression for Reynolds number in service side for upward flow, cooling and downward flow heating?
|
| A. | 0.15 |
| B. | 0.015 |
| C. | 0.128 |
| D. | 0.28 |
| Answer» D. 0.28 | |
| 5. |
For conventional unbaffled jacket, what is the term X in the expression for Reynolds number in service side for upward flow, heating and downward flow cooling?
|
| A. | 0.15 |
| B. | 0.015 |
| C. | 0.128 |
| D. | 0.28 |
| Answer» B. 0.015 | |
| 6. |
What is the correct expression for Reynolds number in service side for jacket type Agitated Vessels? |
| A. | (Nu=K( frac{z^3 rho^2 beta g Delta Tm}{ mu^2})^{1/3}Pr^{1/4} ) |
| B. | (Nu=K( frac{z^3 rho^2 beta g Delta Tm}{ mu^2})^{1/3}Pr^{1/3} ) |
| C. | (Nu=K( frac{ rho^2 beta g Delta Tm}{ mu^2})^{1/3}Pr^{1/4} ) |
| D. | (Nu=K( frac{z^3 rho^2 beta g Delta Tm}{ mu^2})^{1/3}Pr^{1/4} ) |
| Answer» C. (Nu=K( frac{ rho^2 beta g Delta Tm}{ mu^2})^{1/3}Pr^{1/4} ) | |
| 7. |
What is the expression for Equivalent diameter?
|
| A. | nDt = the vessel thickness |
| B. | 0.816Dj |
| C. | 0.8(Dj Dt) |
| D. | 0.816(Dj Dt) |
| E. | 0.8Dt |
| Answer» D. 0.816(Dj Dt) | |
| 8. |
What is the equivalent diameter of Jacketed vessel, if the diameter of the jacket is 40mm and that of vessel is 30mm? |
| A. | 8mm |
| B. | 8.16mm |
| C. | 9mm |
| D. | 10mm |
| Answer» C. 9mm | |
| 9. |
What is the correct expression for calculating Nusselt number for a Jacketed Vessel? |
| A. | Nu= ( frac{0.03Re^{3/4}Pr}{1+1.74Re^{-1/8}(Pr u2061-1)} frac{ theta^{0.14}}{ theta w} ) |
| B. | Nu= ( frac{0.03Re^{3/4}Pr}{1+Re^{-1/8}(Pr u2061-1)} frac{ theta^{0.14}}{ theta w} ) |
| C. | Nu= ( frac{0.03Pr}{1+1.74Re^{-1/8}(Pr u2061-1)} frac{ theta^{0.14}}{ theta w} ) |
| D. | Nu= ( frac{0.03Re^{3/4}}{1+1.74Re^{-1/8}(Pr u2061-1)} ) |
| Answer» B. Nu= ( frac{0.03Re^{3/4}Pr}{1+Re^{-1/8}(Pr u2061-1)} frac{ theta^{0.14}}{ theta w} ) | |
| 10. |
What is the term X in the following equation for overall heat transfer coefficient?
|
| A. | Thickness of jacket |
| B. | Thickness of vessel wall |
| C. | Thickness of vessel + jacket |
| D. | Thickness of vessel jacket |
| Answer» C. Thickness of vessel + jacket | |
| 11. |
For agitated vessels, what is the correct expression for the Overall Heat Transfer Coefficient? |
| A. | ( frac{1}{U} = frac{1}{hAb}+ frac{X}{K}+ frac{1}{hAc} ) |
| B. | ( frac{1}{U} = frac{1}{hAb}+ frac{K}{X}+ frac{1}{hAc} ) |
| C. | ( frac{1}{U} = frac{1}{hAb}+ frac{1}{K}+ frac{1}{hAc} ) |
| D. | ( frac{1}{U} = frac{1}{hAb}+ frac{1}{KX}+ frac{1}{hAc} ) |
| Answer» B. ( frac{1}{U} = frac{1}{hAb}+ frac{K}{X}+ frac{1}{hAc} ) | |
| 12. |
Which one of the following is correct expression for calculating time t to reach temperature T ? |
| A. | (t= frac{MCp(Ts-To)}{UA(Ts-T)} ) |
| B. | (t= frac{MCp(Ts-T)}{UA(Ts-To)} ) |
| C. | (t= frac{UA(Ts-To)}{MCp(Ts-T)} ) |
| D. | (t= frac{MCp}{UA}log frac{Ts-To}{Ts-T} ) |
| Answer» E. | |
| 13. |
What is the term X in the following equation?
|
| A. | Service side temperature |
| B. | Process side temperature |
| C. | Service side temperature difference |
| D. | Process side temperature difference |
| Answer» B. Process side temperature | |
| 14. |
The rate of change of temperature in an agitated vessel can be represented as which one of the following? |
| A. | ( frac{ delta T}{ delta t} = frac{UA}{MCp}(T-Ts) ) |
| B. | ( frac{ delta T}{ delta t} = frac{UA}{MCp}(Ts-T) ) |
| C. | ( frac{ delta T}{ delta t} = frac{MCp}{UA}(Ts-T) ) |
| D. | ( frac{ delta T}{ delta t} = frac{MCp}{UA(Ts-T)} ) |
| Answer» C. ( frac{ delta T}{ delta t} = frac{MCp}{UA}(Ts-T) ) | |
| 15. |
Why are agitated vessels usually used in batch manufacture? |
| A. | Necessary to calculate the time to heat or cool a batch |
| B. | Because batch processes occur in vessels |
| C. | It avoids harmful reactions |
| D. | It supports endothermic reactions |
| Answer» B. Because batch processes occur in vessels | |