MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 16 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. |
For the same amount of fabrication material and same inside capacity, the heat loss is lowest in |
| A. | Sphere |
| B. | Cylinder |
| C. | Rectangle |
| D. | Cube |
| Answer» C. Rectangle | |
| 2. |
For the same material and same temperature difference, the heat flow in terms of shape factor is given by |
| A. | S k d t |
| B. | k d t/S |
| C. | 2S k/d t |
| D. | 2S/3 |
| Answer» B. k d t/S | |
| 3. |
The shape factor for complete rectangular furnace isWhere a, b and c are the inside dimensions and d x is the wall thicknessa) 2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d xb) 2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d xc) 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d xd) 2/ d x (a b + b c + c |
| A. | 2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d x |
| B. | 2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d xc) 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d xd) 2/ d x (a b + b c + c a) + 4 (0.54) (a + b + |
| C. | + 8 (0.45) d xb) 2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d xc) 2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d x |
| D. | 2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x |
| Answer» E. | |
| 4. |
Which is true regarding a complete rectangular furnace? |
| A. | 6 walls, 12 edges and 6 corners |
| B. | 0 walls, 2 edges and 4 corners |
| C. | 6 walls, 12 edges and 8 corners |
| D. | 2 walls, 6 edges and 8 corners |
| Answer» D. 2 walls, 6 edges and 8 corners | |
| 5. |
Shape factor for sphere is |
| A. | 4 π r 1 r 2 |
| B. | 4 π r 1 r 2/r 2 – r 1 |
| C. | 4 π /r 2 – r 1 |
| D. | r 1 r 2/r 2 – r 1 |
| Answer» C. 4 π /r 2 – r 1 | |
| 6. |
The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m * 0.6 m * 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace? |
| A. | 15.24 m |
| B. | 16.34 m |
| C. | 14.54 m |
| D. | 13.76 m |
| Answer» B. 16.34 m | |
| 7. |
Shape factor for cylinder is |
| A. | 6 π l/log e (r 2/r 1) |
| B. | 4 π l/log e (r 2/r 1) |
| C. | π l/log e (r 2/r 1) |
| D. | 2 π l/log e (r 2/r 1) |
| Answer» E. | |
| 8. |
For a prescribed temperature difference, bodies with the same shape factor will allow heat conduction proportional to |
| A. | k/2 |
| B. | 2k |
| C. | k |
| D. | k/4 |
| Answer» D. k/4 | |
| 9. |
Shape factor for a plane wall is equal to |
| A. | A/δ |
| B. | 2A/δ |
| C. | 3A/δ |
| D. | 4A/δ |
| Answer» B. 2A/δ | |
| 10. |
“All the factors relating to the geometry of the sections are grouped together into a multiple constant called the shape factor”. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
WHAT_IS_THE_SHAPE_FACTOR_FOR_A_HEMISPHERICAL_BOWL_WITH_RESPECT_TO_ITSELF_OF_DIAMETER_D?_THE_CAVITY_IS_CLOSED_ON_ITS_OUTER_SURFACE_WITH_A_FLAT_PLATE?$ |
| A. | 1.5 |
| B. | 1 |
| C. | 0.5 |
| D. | 2.5 |
| Answer» D. 2.5 | |
| 12. |
What is the shape factor of hemispherical surface closed by a plane surface of diameter d? |
| A. | 0 |
| B. | 1.5 |
| C. | 1 |
| D. | 0.5 |
| Answer» E. | |
| 13. |
What is the value of shape factor for two infinite parallel surfaces separated by a distance x? |
| A. | 0 |
| B. | 1 |
| C. | x |
| D. | Infinity |
| Answer» C. x | |
| 14. |
Two radiating surface A 1 = 6 m2 and A 2 = 4 m2 have shape factor F 12 = 0.1. Then the shape factor F 21 will be |
| A. | 0.12 |
| B. | 0.18 |
| C. | 0.15 |
| D. | 0.10 |
| Answer» D. 0.10 | |
| 15. |
The reciprocity theorem states that |
| A. | F <sub>12</sub> = F <sub>21</sub> |
| B. | A <sub>1 </sub>F <sub>12 </sub>= A<sub> 2</sub> F <sub>21</sub> |
| C. | A <sub>1 </sub>F <sub>21 </sub>= A<sub> 2</sub> F <sub>12</sub> |
| D. | A <sub>2 </sub>F <sub>21 </sub>= A<sub> 1</sub> F <sub>12</sub> |
| Answer» C. A <sub>1 </sub>F <sub>21 </sub>= A<sub> 2</sub> F <sub>12</sub> | |
| 16. |
Which of the following is a wrong statement according to the shape factor is equal to one? |
| A. | For any surface completely enclosed by another surface |
| B. | For infinite parallel planes radiating only to each other |
| C. | For a flat or convex surface with respect to itself |
| D. | Inside cylinder to outer cylinder of a long co-axial cylinder |
| Answer» E. | |