MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
Which of the following is the unit of thermal resistance? |
| A. | degree/kcal |
| B. | hour degree |
| C. | s degree/kcal |
| D. | degree/W |
| Answer» E. | |
| 2. |
“Thermal conductivity represents the amount of heat conducted across the unit area when a temperature difference of one kelvin”. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The diagram shows heat conduction through a plane wall. The surface temperature is 475 K and it radiates heat to the surroundings at 335 K. If thermal conductivity of the material is 12.5 W/m degree, find the temperature gradient. Let convective coefficient be 80 W/m2 degree and radiation factor is 0.9 |
| A. | – 1052.4 degree celsius |
| B. | – 2052.4 degree celsius |
| C. | – 3052.4 degree celsius |
| D. | – 4052.4 degree celsius |
| Answer» B. – 2052.4 degree celsius | |
| 4. |
Consider the following statements:The Fourier heat conduction equationQ = -k A d t /d xPresumesi) Steady state conditionsii) Constant value of thermal conductivityiii) Uniform temperature at the wall surfaceiv) One dimensional heat flowWhich of these statements are correct? |
| A. | i, ii and iii |
| B. | i, ii and iv |
| C. | i, iii and iv |
| D. | i, iii and iv |
| Answer» E. | |
| 5. |
‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ‚À´THERMAL_CONDUCTIVITY_REPRESENTS_THE_AMOUNT_OF_HEAT_CONDUCTED_ACROSS_THE_UNIT_AREA_WHEN_A_TEMPERATURE_DIFFERENCE_OF_ONE_KELVIN‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖŒÄ.?$# |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which_of_the_following_is_the_unit_of_thermal_resistance?$ |
| A. | degree/kcal |
| B. | hour degree |
| C. | s degree/kcal |
| D. | degree/W |
| Answer» E. | |
| 7. |
Which one is not the unit of thermal conductivity? |
| A. | kcal/m hr K |
| B. | KJ/m hr K |
| C. | W/m s K |
| D. | Cal/cm s K |
| Answer» D. Cal/cm s K | |
| 8. |
Transmission of heat i.e. molecular is smallest in case of |
| A. | Gases |
| B. | Liquids |
| C. | Alloys |
| D. | Solids |
| Answer» B. Liquids | |
| 9. |
Negative sign in Fourier heat conduction equation indicates |
| A. | Heat always flow is in the direction of positive temperature gradient |
| B. | Heat always flow in the direction of negative temperature gradient |
| C. | No heat flow is there |
| D. | Data is insufficient |
| Answer» C. No heat flow is there | |
| 10. |
Here are some assumptions that are made for Fourier law. Identify the wrong one |
| A. | No internal heat generation |
| B. | Steady state heat conduction |
| C. | Non- linear temperature profile |
| D. | Isotropic and homogenous material |
| Answer» D. Isotropic and homogenous material | |
| 11. |
Fourier law of heat conduction is best represented by |
| A. | Q = -k A d t /d x |
| B. | Q = k A d x/d t |
| C. | Q = -k A |
| D. | Q = k d t/d x |
| Answer» B. Q = k A d x/d t | |
| 12. |
The famous Fourier series is named after |
| A. | Diller and Ryan |
| B. | J.B. Joseph Fourier |
| C. | Stefan- Boltzmann |
| D. | Wein’s |
| Answer» C. Stefan- Boltzmann | |