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MCQs 1: Which theory is widely used to determine the heat transfer coefficient for film condensation on surfaces?

Reynold's theory Grashof's theory Nusselt's theory Prandtl's theory
Answer Explanation

MCQs 2: According to the Nusselt's theory, to determine the heat transfer coefficient for film condensation on surfaces,

the vapour should be pure, dry and saturated the condensate flow should be laminar heat transfer should be at steady state all of the above
Answer Explanation

MCQs 3: What should be the temperature of black body to emit radiant energy which is independent of the conditions in the surroundings?

temperature of black body should be less than zero temperature of black body should be more than zero temperature of black body should be equal to zero all of the above
Answer Explanation

MCQs 4: Gray body can emits radiation

at higher rate than the black body at lower rate than the black body at equal rate than the black body cannot predict
Answer Explanation

MCQs 5: What is the mode of heat transfer from the hot surface to the adjacent layer of fluid which surrounds the surface?

conduction mode of heat transfer radiation mode of heat transfer convection mode of heat transfer none of the above
Answer Explanation

MCQs 6: Convective heat transfer coefficient is also known as

film convection factor film coefficient film conductance none of the above
Answer Explanation

MCQs 7: Suppose a hot water is placed inside a closed metal vessel of thickness 5 mm. There is atmospheric air outside the vessel at temperature lower than the temperature of hot water. The heat is transferred from the hot water to atmospheric air. What is the mode of heat transfer in this condition?

conduction then convection convection then conduction convection then conduction then convection conduction then convection then conduction
Answer Explanation

MCQs 8: The current in the electrical system is analogous to

the temperature in the heat transfer system the heat flow in the heat transfer system the thermal conductance in the heat transfer system the thermal resistance in the heat transfer system
Answer Explanation

MCQs 9: The term in the heat transfer system which is analogous to the electrical resistance is called as

thermal resistance conductive resistance potential resistance none of the above
Answer Explanation

MCQs 10: In turbulent flow of the fluid,

conduction becomes more important conduction becomes less important doesn't matter none of the above
Answer Explanation

MCQs 11: Mixing of fluid from regions of high temperature with the fluid from region of low temperature

increases the rate of heat transfer decreases the rate of heat transfer rate of heat transfer is not affected none of the above
Answer Explanation

MCQs 12: The Nusselt modulus or Nusselt number is a convenient measure of

rate of heat transfer convective heat transfer coefficient both a. and b. none of the above
Answer Explanation

MCQs 13: What is the correct formula for the Nusselt modulus or Nusselt number (Nu)?

Nu = h k l Nu = (h k) / l Nu = (k l) / h Nu = (h l) / k
Answer Explanation

MCQs 14: Which among the following are the methods for estimation of convective heat transfer coefficient? (1) Analogy between heat, mass and momentum transfer (2) Dimensional analysis coupled with experimental data (3) Approximate analysis of the boundary layer equation (4) Exact mathematical analysis of the boundary layer equation

(1), (2) and (3) (2), (3) and (4) (1), (2) and (4) all of the given (1), (2), (3) and (4)
Answer Explanation

MCQs 15: Which among the following methods for estimation of convective heat transfer coefficient are having some limitations? (1) Analogy between heat, mass and momentum transfer (2) Dimensional analysis coupled with experimental data (3) Approximate analysis of the boundary layer equation (4) Exact mathematical analysis of the boundary layer equation

(1), (2) and (3) (2), (3) and (4) (1), (2) and (4) all of the given (1), (2), (3) and (4)
Answer Explanation

MCQs 16: Which method for estimation of convective heat transfer coefficient is mathematically simple and finds wide range of applications?

Analogy between heat, mass and momentum transfer Dimensional analysis coupled with experimental data Approximate analysis of the boundary layer equation Exact mathematical analysis of the boundary layer equation
Answer Explanation

MCQs 17: A thorough knowledge of the mechanism is necessary for the estimate of convective heat transfer coefficient so that the process can be adequately represented by mathematical equation. This is a limitation of the method of

analogy between heat, mass and momentum transfer approximate analysis of the boundary layer equation dimensional analysis coupled with experimental data exact mathematical analysis of the boundary layer equation
Answer Explanation

MCQs 18: What is/are the limitation/s of dimensional analysis for estimation of convection heat transfer coefficient?

it does not provide any knowledge of the mechanism it is necessary to know theoretically the variables which influence the phenomena both a. and b. none of the above
Answer Explanation

MCQs 19: What is the black body or an ideal radiator?

the body which transmits all the radiations incident upon it the body which absorbs all the radiations incident upon it the body which reflects all the radiations incident upon it none of the above
Answer Explanation

MCQs 20: As a radiator, the black body emits the maximum possible thermal radiation

at a constant single wavelength at the maximum wavelength at all wavelengths none of the above
Answer Explanation

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