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MCQs 1: Heat transfer deals with the rate of

work transfer temperature transfer energy transfer none of the above
Answer Explanation

MCQs 2: Which among the following has lowest thermal conductivity among the others?

silver water mercury copper
Answer Explanation

MCQs 3: In gases, the transfer of heat takes place by

volumetric density transporting energy with free electrons unstable elastic collision random molecular collision
Answer Explanation

MCQs 4: How does the heat transfer take place in metals?

volumetric density transporting energy with free electrons unstable elastic collision d. random molecular collision None of the above
Answer Explanation

MCQs 5: Internal energy of a substance is associated with

microscopic modes of energy macroscopic modes of energy both a. and b. none of the above
Answer Explanation

MCQs 6: In which phase of a substance does conduction mode of heat transfer take place?

solid liquid gaseous all of the above
Answer Explanation

MCQs 7: Mass transfer does not take place in

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

MCQs 8: What is the condition for conduction mode of heat transfer between two bodies?

the two bodies must be in physical contact there must be temperature gradient between the bodies both a. and b. none of the above
Answer Explanation

MCQs 9: In which mode, does the heat energy transfer between two bodies when they are separated by some distance and there is no any medium between them?

conduction mode of heat transfer convection mode of heat transfer radiation mode of heat transfer heat transfer cannot takes place with above condition
Answer Explanation

MCQs 10: The radiant heat emitted by any body travels at the speed

less than the speed of light more than the speed of light equals to the speed of light unpredictable
Answer Explanation

MCQs 11: In convection heat transfer energy transfer takes place between

two solid surfaces connected physically solid surface and fluid system in motion both a. and b. none of the above
Answer Explanation

MCQs 12: The convection heat transfer coefficient depends upon

the thermal properties of fluid geometry of the system characteristics of the fluid flow all of the above
Answer Explanation

MCQs 13: In a process of heat transfer by convection from a body to the surrounding fluid, the convection heat transfer coefficient

remains constant over the entire surface of the body does not remain constant over the entire surface of the body Both A & B none of the above
Answer Explanation

MCQs 14: Which two processes are unitedly responsible in the transfer of heat between solid surface and surrounding fluid?

conduction and convection conduction and mass transfer convection and mass transfer none of the above
Answer Explanation

MCQs 15: When the surface of a body is at higher temperature than the surrounding fluid, then the heat flows firstly from surface of the body to the adjacent layer of fluid by

convection conduction radiation none of the above
Answer Explanation

MCQs 16: The fluid flow in which the fluid particles in one layer do not mix with the fluid particles in the other layer is called as

laminar flow turbulent flow layer flow none of the above
Answer Explanation

MCQs 17: Generally, all the fluid particles in flowing fluid

flow at a constant velocity flow at various velocities flow at a velocity as high as possible none of the above
Answer Explanation

MCQs 18: What is the relation between the rate of convection heat transfer and the rate of mixing in turbulent fluid flow?

the rate of convection heat transfer decreases with increase in the rate of mixing in turbulent fluid flow the rate of convection heat transfer increases with increase in the rate of mixing in turbulent fluid flow the rate of convection heat transfer does not affected by the change in the rate of mixing in turbulent fluid flow none of the above
Answer Explanation

MCQs 19: Viscosity of a fluid can be defined as

change in density of the fluid per unit temperature flow resistance offered by the fluid flow velocity change none of the above
Answer Explanation

MCQs 20: The radiation takes place

through molecular communication through vacuum both a. and b. none of the above
Answer Explanation

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