Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part2 : 11 to 15
Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.Heat conducted through unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called |
| thermal resistance |
| thermal coefficient |
| temperature gradient |
| thermal conductivity |
| heat-transfer. |
12.Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in |
| electric heater |
| steam condenser |
| melting of ice |
| refrigerator condenser coils |
| boiler. |
13.LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is |
| higher |
| lower |
| same |
| depends on the area of heat exchanger |
| depends on temperature conditions. |
14.Thermal diffusivity is |
| a dimensionless parameter |
| function of temperature |
| used as mathematical model |
| a physical property of the material |
| useful in case of heat transfer by radiation. |
15.Unit of thermal diffusivity is |
| m2/hr |
| m2/hr�C |
| kcal/m2 hr |
| kcal/m.hr�C |
| kcal/m2 hr�C. |
More Heat Transfer QUESTIONS AND ANSWERS available in next pages
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