MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | conduction and convection |
| Answer» D. conduction and convection | |
| 2. |
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | conduction and convection |
| Answer» B. convection | |
| 3. |
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as |
| A. | Krichoff's law |
| B. | Stefan's law |
| C. | Wien' law |
| D. | Planck's law |
| Answer» B. Stefan's law | |
| 4. |
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the absorptivity of surface is |
| A. | 0.45 |
| B. | 0.55 |
| C. | 0.40 |
| D. | 0.75 |
| Answer» B. 0.55 | |
| 5. |
Heat conducted through unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called |
| A. | thermal resistance |
| B. | thermal coefficient |
| C. | temperature gradient |
| D. | thermal conductivity |
| Answer» E. | |