MCQOPTIONS
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MCQOPTIONS
This section includes 7 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. |
The diffusion equations
|
| A. | nGoverns the temperature distribution under unsteady heat flow through a homogeneous and isotropic material. The Fourier equation follows from this expression when |
| B. | Temperature doesn t depends on time |
| C. | There is no internal heat generation |
| D. | Steady state conditions prevail |
| E. | There is no internal heat generation but unsteady state condition prevails |
| Answer» E. There is no internal heat generation but unsteady state condition prevails | |
| 2. |
The relation 2 t =0 is referred to as |
| A. | Poisson s equation |
| B. | Fourier heat conduction equation |
| C. | Solution for transient conduction |
| D. | Laplace equation |
| Answer» E. | |
| 3. |
The thermal conductivity and the electrical conductivity of a metal at absolute temperature are related as |
| A. | k/ T |
| B. | k/ |
| C. | k /T |
| D. | k/T |
| Answer» B. k/ | |
| 4. |
For liquids, thermal conductivity is governed by the relation |
| A. | k = A c <sub>p </sub>p<sup>7/3</sup>/M<sup>1/3</sup> |
| B. | k = 2A c <sub>p </sub>p<sup>4/3</sup>/M<sup>2/3</sup> |
| C. | k = A c <sub>p </sub>p<sup>4/3</sup>/M<sup>1/3</sup> |
| D. | k = A c <sub>p </sub>p<sup>8/3</sup>/M<sup>1/3</sup> |
| Answer» D. k = A c <sub>p </sub>p<sup>8/3</sup>/M<sup>1/3</sup> | |
| 5. |
The value of Lorenz number in 10-8 W ohms/K2 is |
| A. | 2.02 |
| B. | 2.35 |
| C. | 2.56 |
| D. | 2.45 |
| Answer» E. | |
| 6. |
Low temperature insulation are used when the enclosure is at a temperature lower than the ambient temperature. Which one of the following is not a low temperature insulation? |
| A. | Asbestos |
| B. | Cork |
| C. | Cattle hair |
| D. | Slag wool |
| Answer» B. Cork | |
| 7. |
From the concept of kinetic theory, mean travel velocity of the gas molecules is prescribed by the relation |
| A. | V = (3M/GT) <sup>1/2</sup> |
| B. | V = (3GT/M) <sup>1/2</sup> |
| C. | V = (6T/GM) <sup>1/2</sup> |
| D. | V = (3GT/2M) <sup>1/2</sup> |
| Answer» C. V = (6T/GM) <sup>1/2</sup> | |