41. The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
42. Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the
43. In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is
44. Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place
45. At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?
46. Pick out the wrong statement.
47. A body is called grey if the monochromatic emissivity of the body is
48. Rate of crystallisation does not depend upon the
49. Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.
50. Stefan-Boltzman law applies to __________ body.
Read More Section(Heat Transfer)
Each Section contains maximum 100 MCQs question on Heat Transfer. To get more questions visit other sections.