MCQOPTIONS
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MCQOPTIONS
This section includes 4 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. |
To effect a bond between two metal plates, 2.5 cm and 15 cm thick, heat is uniformly applied through the thinner plate by a radiant heat source. The bonding must be held at 320 K for a short time. When the heat source is adjusted to have a steady value of 43.5 k W/m2, a thermocouple installed on the side of the thinner plate next to source indicates a temperature of 345 K. Calculate the temperature gradient for heat conduction through thinner plate. In the diagram, the upper plate is 2.5 cm thick while the lower is 15 cm thick. |
| A. | – 1000 degree Celsius/m |
| B. | – 2000 degree Celsius/m |
| C. | – 3000 degree Celsius/m |
| D. | – 4000 degree Celsius/m |
| Answer» B. – 2000 degree Celsius/m | |
| 2. |
The unit of thermal diffusivity is |
| A. | m2/hr-K |
| B. | kcal/m2-hr |
| C. | m2/hr |
| D. | m/hr-K |
| Answer» D. m/hr-K | |
| 3. |
The relation Ϫ2 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. | |
| 4. |
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. | |