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. |
If is less than zero, then with respect to the relation k = k0 (1 + t), conductivity depends on surface area . |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The temperatures on the two sides of a plane wall are t1 and t2 and thermal conductivity of the wall material is prescribed by the relation
|
| A. | nWhere, k<sub>0</sub> is constant and is the wall thickness. Find the relation for temperature distribution in the wall? |
| B. | t <sub>1</sub> t <sub>x </sub>/ t <sub>1</sub> t <sub>2</sub> = x |
| C. | t <sub>1</sub> t <sub>x </sub>/ t <sub>1</sub> t <sub>2</sub> = |
| D. | t <sub>1</sub> t <sub>x </sub>/ t <sub>1</sub> t <sub>2</sub> = /x |
| E. | t <sub>1</sub> t <sub>x </sub>/ t <sub>1</sub> t <sub>2</sub> = x/ |
| Answer» E. t <sub>1</sub> t <sub>x </sub>/ t <sub>1</sub> t <sub>2</sub> = x/ | |
| 3. |
The unit of thermal conductivity doesn t contain which parameter? |
| A. | Watt |
| B. | Pascal |
| C. | Meter |
| D. | Kelvin |
| Answer» C. Meter | |
| 4. |
If is greater than zero, then choose the correct statement with respect to given relation
|
| A. | k doesn t depend on temperature |
| B. | k depends on temperature |
| C. | k is directly proportional to t |
| D. | Data is insufficient |
| Answer» D. Data is insufficient | |
| 5. |
With respect to the equation k = k0 (1 + t) which is true if we put = 0? |
| A. | Slope of temperature curve is constant |
| B. | Slope of temperature curve does not change |
| C. | Slope of temperature curve increases |
| D. | Slope of temperature curve is decreases |
| Answer» B. Slope of temperature curve does not change | |
| 6. |
A plane wall of thickness has its surfaces maintained at temperatures T1 and T2. The wall is made of a material whose thermal conductivity varies with temperature according to the relation k = k0 T2. Find the expression to work out the steady state heat conduction through the wall? |
| A. | Q = 2A k<sub>0</sub> (T <sub>1 </sub><sup>3</sup> T <sub>2 </sub><sup>3</sup>)/3 |
| B. | Q = A k<sub>0</sub> (T <sub>1 </sub><sup>3</sup> T <sub>2 </sub><sup>3</sup>)/3 |
| C. | Q = A k<sub>0</sub> (T <sub>1 </sub><sup>2</sup> T <sub>2 </sub><sup>2</sup>)/3 |
| D. | Q = A k<sub>0</sub> (T <sub>1</sub> T <sub>2</sub>)/3 |
| Answer» C. Q = A k<sub>0</sub> (T <sub>1 </sub><sup>2</sup> T <sub>2 </sub><sup>2</sup>)/3 | |
| 7. |
The inner and outer surfaces of a furnace wall, 25 cm thick, are at 300 degree Celsius and 30 degree Celsius. Here thermal conductivity is given by the relation
|
| A. | nWhere, t is the temperature in degree centigrade. Calculate the heat loss per square meter of the wall surface area? |
| B. | 1355.3 kJ/m<sup>2</sup> hr |
| C. | 2345.8 kJ/m<sup>2</sup> hr |
| D. | 1745.8 kJ/m<sup>2</sup> hr |
| E. | 7895.9 kJ/m<sup>2</sup> hr |
| Answer» D. 1745.8 kJ/m<sup>2</sup> hr | |