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MCQs 1: A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?

better insulation should be put over pipe and better one over it inferior insulation should be put over pipe and better one over it both may be put in any order whether to put inferior OIL over pipe or the better one would depend on steam temperature unpredictable
Answer Explanation

MCQs 2: According of Kirchhoff’s law______________________?

radiant heat is proportional to fourth power of absolute temperature emissive power depends on temperature emissive power and absorptivity are constant for all bodies ratio of emissive power to absorptive power is maximum for perfectly black body ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Answer Explanation

MCQs 3: 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
Answer Explanation

MCQs 4: Fourier’s law of heat conduction is valid for_________________?

one dimensional cases only two dimensional cases only three dimensional cases only regular surfaces having non-uniform temperature gradients irregular surfaces
Answer Explanation

MCQs 5: In counter flow heat exchangers_________________?

both the fluids at inlet (of heat ex¬changer where hot fluid enters) are in their coldest state both the fluids at inlet are in their hot¬test state both the fluids .at exit are in their hottest state one fluid is in hottest state and other in coldest state at inlet any combination is possible depending on design of heat exchanger
Answer Explanation

MCQs 6: The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?

conduction convection radiation conduction and convection convection and radiation
Answer Explanation

MCQs 7: Joule sec is the unit of_________________?

universal gas constant kinematic viscosity thermal conductivity Planck’s constant none of the above
Answer Explanation

MCQs 8: According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

grey body brilliant white polished body red hot body black body none of the above
Answer Explanation

MCQs 9: All radiations in a black body are___________________?

reflected refracted transmitted absorbed partly reflected and partly absorbed
Answer Explanation

MCQs 10: The unit of overall coefficient of heat transfer is___________________?

kcal/m2 kcal/hr °C kcal/m2 hr °C kacl/m hr °C kcal/m3 hr °C
Answer Explanation

MCQs 11: The value of the wavelength for maximum emissive power is given by ___________________?

Wien’s law Planck’s law Stefan’s law Fourier’s law Kirchhoff’s law
Answer Explanation

MCQs 12: Total emissivity of polished silver compared to black body is___________________?

same higher more or less same very much lower very much higher
Answer Explanation

MCQs 13: The value of Prandtl number for air is about _______________________?

0.1 0.3 0.7 1.7 10.5
Answer Explanation

MCQs 14: The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?

shorter wavelength longer wavelength remains same at all wavelengths wavelength has nothing to do with it none of the above
Answer Explanation

MCQs 15: Which of the following property of air does not increase with rise in temperature ________________?

thermal conductivity thermal diffusivity density dynamic viscosity kuiematic viscosity
Answer Explanation

MCQs 16: In free con-vection heat transfer, Nusselt number is function of________________?

Grashoff no. and Reynold no Grashoff no and Prandtl no. Prandtl no. and Reynold no Grashoff no., Prandtl no and Reynold no none of the above
Answer Explanation

MCQs 17: According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?

absolute temperature square of temperature fourth power of absolute temperature fourth power of temperature cube of absolute temperature
Answer Explanation

MCQs 18: Log mean temperature difference in case of counter flow compared to parallel flow will be________________?

same more less depends on other factors none of the above
Answer Explanation

MCQs 19: The unit of Stefan Boltzmann constant is ____________________?

watt/cm2 °K watt/cm4 °K watt2/cm °K4 watt/cm2 °K4 watt/cm2 °K2
Answer Explanation

MCQs 20: Stefan Boltzmann law is applicable for heat transfer by __________________?

conduction convection radiation conduction and radiation combined convection and radiation combined
Answer Explanation

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