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MCQs 1: As the radius increases in hollow cylinder the temperature

also increases decreases it depends upon the direction of heat flow unpredictable
Answer Explanation

MCQs 2: What is the effect of change in outer radius of the hollow cylinder on the thermal resistance of conduction?

the thermal resistance of conduction increases with increase in outer radius of the hollow cylinder the thermal resistance of conduction decreases with increase in outer radius of the hollow cylinder the thermal resistance of conduction remains same with change in outer radius of the hollow cylinder unpredictable
Answer Explanation

MCQs 3: What is the effect of change in outer radius of the hollow cylinder on the thermal resistance of convection?

the thermal resistance of convection increases with increase in outer radius of the hollow cylinder the thermal resistance of convection decreases with increase in outer radius of the hollow cylinder the thermal resistance of convection remains same with change in outer radius of the hollow cylinder unpredictable
Answer Explanation

MCQs 4: Consider a plane wall of area A, having a layer of insulation on it. What will happen to the thermal resistance for convection of wall if the thickness of the insulation is increased?

the thermal resistance for convection increases with increase in thickness of insulation the thermal resistance for convection decreases with increase in thickness of insulation the thermal resistance for convection remains same with increase in thickness of insulation unpredictable
Answer Explanation

MCQs 5: Which of the following assumptions is/are correct to obtain an analytical solution for the problem on laminar boundary layer of fluid on flat plate?

The fluid is incompressible The fluid is in steady-state The is not affected by fluid flow all of the above
Answer Explanation

MCQs 6: Change in momentum is

the result of powers acting on the surface of the control volume the result of works acting on the surface of the control volume the result of forces acting on the surface of the control volume none of the above
Answer Explanation

MCQs 7: Assume a turbulent flow of a fluid on a flat plate. A very thin region near the plate surface is called as

laminar buffer layer laminar sublayer laminar turbulent layer none of the above
Answer Explanation

MCQs 8: The layer above the laminar sublayer with some turbulence and still having importance of viscous action is called as

sub-sublayer turbulent layer buffer layer none of the above
Answer Explanation

MCQs 9: The layer through which the momentum and energy transfer take place via the movement of macroscopic lumps of matter from one region to another is called as

the laminar sublayer the buffer layer the turbulent layer none of the above
Answer Explanation

MCQs 10: What is used instead of ν, in turbulent boundary layer condition?

eddy diffusivity for momentum eddy diffusivity for force eddy diffusivity for heat none of the above
Answer Explanation

MCQs 11: The eddy properties are used in turbulent boundary layer condition because

the eddy properties may be small compared to molecular properties the eddy properties may be large compared to molecular properties the eddy properties may be small or may be large compared to molecular properties, but never equals to molecular properties none of the above
Answer Explanation

MCQs 12: Generally, natural convection occurs due to

change in velocity of a fluid change in density of a fluid change in molecular structure of a fluid none of the above
Answer Explanation

MCQs 13: The rate of radiant flux between two black bodies is analogous to

resistance in electrical system voltage in electrical system current in electrical system none of the above
Answer Explanation

MCQs 14: How does the gray body differ from the black body?

all the incident radiation is not absorbed completely by gray body the emissivity of the gray body is less than unity the absorptivity of the gray body is less than unity all of the above
Answer Explanation

MCQs 15: How are the real bodies in terms of diffuseness?

real bodies are perfectly diffuse real bodies are not perfectly diffuse Both A & B None of these
Answer Explanation

MCQs 16: For the diffuse surfaces

the intensity of emitted radiation is constant and depends upon the direction the intensity of emitted radiation is not constant and depends upon the direction the intensity of emitted radiation is constant and does not depend upon the direction none of the above
Answer Explanation

MCQs 17: What is the relation between absorptivity (α), reflectivity (ρ) and transmissivity (τ) for gray body?

ρ + α + τ =1 α + τ =1 ρ + τ =1 ρ + α =1
Answer Explanation

MCQs 18: What is irradiation (G)?

the total radiation incident upon a surface per unit time per unit surface area the total radiation leaving a surface per unit time per unit surface area the net radiation exchanging between two surfaces per unit time per unit surface area none of the above
Answer Explanation

MCQs 19: Which of the following is/are example/s of heat exchanger?

Feed water heater in which a stream of steam is directly mixed with cold water and the mixture leaves at uniform temperature Feed water heater in which a stream of steam and cold water are not mixed and separated by partition through which heat flows both a. and b. none of the above
Answer Explanation

MCQs 20: Which of the following phases of designing of heat exchangers does designer consider corrosive nature of the fluid in?

The thermal analysis The mechanical design The design for manufacture none of the above
Answer Explanation

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