MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
Consider the above problem, make calculations for the rate of heat flow per unit mass of fin material used |
| A. | 126.53 W/kg |
| B. | 154.76 W/kg |
| C. | 134.87 W/kg |
| D. | 165.46 W/kg |
| Answer» B. 154.76 W/kg | |
| 2. |
An air cooled cylindrical wall is to be fitted with triangular fins of 3 cm thickness at base and 12 cm in height. The fins are made from stainless steel with density 8000 kg/m3 and thermal conductivity 17.5 W/m K. The wall temperature is 600 degree Celsius and the fin is exposed to an environment with t a = 30 degree Celsius and h = 20 W/m2 K. What is the temperature distribution along the fin? |
| A. | t = 10 + 250 I<sub> 0</sub> [6.056 (x)<sup> 1/2</sup>]. |
| B. | t = 20 + 250 I<sub> 0</sub> [6.056 (x)<sup> 1/2</sup>]. |
| C. | t = 30 + 250 I<sub> 0</sub> [6.056 (x)<sup> 1/2</sup>]. |
| D. | t = 40 + 250 I<sub> 0</sub> [6.056 (x)<sup> 1/2</sup>]. |
| Answer» D. t = 40 + 250 I<sub> 0</sub> [6.056 (x)<sup> 1/2</sup>]. | |
| 3. |
The heat dissipation at any section of parabolic fin is given by |
| A. | (t<sub>2</sub> t<sub>1</sub>) (b) ( ) |
| B. | k (t<sub>2</sub> t<sub>1</sub>) (b) ( ) |
| C. | k (t<sub>2</sub> t<sub>1</sub>) ( ) |
| D. | k (t<sub>2</sub> t<sub>1</sub>) (b) |
| Answer» C. k (t<sub>2</sub> t<sub>1</sub>) ( ) | |
| 4. |
Provision of fins on a given heat transfer surface will be more effective if there is |
| A. | Fewer but thick fins |
| B. | Large number of thick fins |
| C. | Fewer but thin fins |
| D. | Large number of thin fins |
| Answer» E. | |
| 5. |
The correction length for cylindrical fin is |
| A. | L <sub>C</sub> = L + d/4 |
| B. | L <sub>C</sub> = 2 L + d/4 |
| C. | L <sub>C</sub> = 3 L + d/4 |
| D. | L <sub>C</sub> = 4 L + d/4 |
| Answer» B. L <sub>C</sub> = 2 L + d/4 | |
| 6. |
For parabolic fin, the curve follows which law? |
| A. | y = C/x<sup>2</sup> |
| B. | y = C x<sup>4</sup> |
| C. | y = C x<sup>2</sup> |
| D. | y = C x<sup>1/2</sup> |
| Answer» D. y = C x<sup>1/2</sup> | |
| 7. |
Which one is true regarding parabolic fin? |
| A. | It dissipates the minimum amount of heat at a minimum material cost |
| B. | It dissipates the minimum amount of heat at a maximum material cost |
| C. | It dissipates the maximum amount of heat at a maximum material cost |
| D. | It dissipates the maximum amount of heat at a minimum material cost |
| Answer» E. | |
| 8. |
If a fin of a constant cross section is used, there would be wastage of material . Chose the correct option |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Heat dissipation by every segment of the fin is |
| A. | Sometimes same |
| B. | Same |
| C. | Not same |
| D. | Sometimes same or sometimes not same |
| Answer» D. Sometimes same or sometimes not same | |
| 10. |
Which fin yields the maximum heat flow per unit weight? |
| A. | Straight triangular fin |
| B. | Curved triangular fin |
| C. | Parabolic fin |
| D. | Hyperbolic fin |
| Answer» B. Curved triangular fin | |