MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
“If β is less than zero, then with respect to the relation k = k0 (1 + β t), conductivity depends on surface area”. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The unit of thermal conductivity doesn’t contain which parameter? |
| A. | Watt |
| B. | Pascal |
| C. | Meter |
| D. | Kelvin |
| Answer» C. Meter | |
| 3. |
If β is greater than zero, then choose the correct statement with respect to given relation |
| A. | k = k0 (1 +β t) |
| B. | k doesn’t depend on temperature |
| C. | k depends on temperature |
| D. | k is directly proportional to t |
| E. | Data is insufficient |
| Answer» D. k is directly proportional to t | |
| 4. |
The accompanying sketch shows the schematic arrangement for measuring the thermal conductivity by the guarded hot plate method. Two similar 1 cm thick specimens receive heat from a 6.5 cm by 6.5 cm guard heater. When the power dissipation by the wattmeter was 15 W, the thermocouples inserted at the hot and cold surfaces indicated temperatures as 325 K and 300 K. What is the thermal conductivity of the test specimen material? |
| A. | 0.81 W/m K |
| B. | 0.71 W/m k |
| C. | 0.61 W/m K |
| D. | 0.51 W/m K |
| Answer» C. 0.61 W/m K | |
| 5. |
With respect to the equation k = k0 (1 +β t) which is true if we put β = 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 δ 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 k0 (T 1 3 – T 2 3)/3 δ |
| B. | Q = A k0 (T 1 3 – T 2 3)/3 δ |
| C. | Q = A k0 (T 1 2 – T 2 2)/3 δ |
| D. | Q = A k0 (T 1 – T 2)/3 δ |
| Answer» C. Q = A k0 (T 1 2 – T 2 2)/3 δ | |