HEAT TRANSFER Mechanical Engineering Question Bank Based on P T U Paper Pattern -Unit 2–CONDUCTION CONDUCTION 1 MARK OBJECTIVE TYPE QUESTIONS Thermal conductivity of metals increases with the (a) Increase of temperature (b) Increase of pressure (c) Decrease of temperature (d) None (Ans: c) Temperature distribution in a plane wall is (a) Parabolic (b) […]
HEAT TRANSFER: MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION ANSWERS ON CONDUCTION IN HEAT TRANSFER — Sheet 1 During conduction of heat, there is a physical motion of the (a) Crystal lattice, (b) Main body, (c) Crystal lattice as well as main body, (d) None Conduction heat transfer takes place (a) In solids only, (b) […]
*HEAT TRANSFER MECHANICAL ENGINEERING Multiple Choice Questions (m c q) on Heat Transfer —-Conduction Thermal conductivity of metals with addition of alloying elements (a) Increases (b) Decreases (c) Remains constant (d) None (Ans: b) Thermal conductivity of metals with increase of hardness (a) Increases (b) Decreases (c) Remains constant (d) None (Ans: b) Thermal conductivity of […]
*HEAT TRANSFER MECHANICAL ENGINEERING Multiple Choice Questions (m c q) on Heat Transfer —Conduction Poisson’ equation in heat transfer deals with (a) Steady state of heat transfer (b) Unsteady state of heat transfer (c) Steady as well as unsteady states of heat transfer (d) None (Ans: a) Laplace equation in heat transfer deals with (a) Steady […]
*HEAT TRANSFER MECHANICAL ENGINEERING Multiple Choice Questions (m c q) on Heat Transfer—-CONDUCTION– 2 Critical radius of insulation refers to (a) Minimum rate of heat transfer (b) Maximum rate of heat transfer (c) Constant rate of heat transfer (d) None (Ans: b) Critical radius of insulation for a cylinder is equal to (a) 3k/ho […]
*HEAT TRANSFER MECHANICAL ENGINEERING Short Interview Question Answers on Conduction and Convection Heat Transfer—-Biot Number, Convective heat transfer coefficient, Numerical data on ‘h’, Mean film temperature, Difference between natural and forced convection, Q . Define Biot number and its significance. Biot number is Bi= conductive resistance/convective resistance = hLc/ksolid Where h is convective heat transfer […]
*HEAT TRANSFER MECHANICAL ENGINEERING Short Interview Question Answers on Conduction and Convection Heat Transfer—-Critical thickness of insulation, temperature distributions for a plane wall, cylinder and a sphere, temperature gradient, velocity gradient and pressure gradient, factors effecting thermal conductivity of a material, factors thermal conductivity of gases depend, Differentiate Nusselt number and Biot number, Grashoff’s number and […]
*HEAT TRANSFER MECHANICAL ENGINEERING Short Interview Question Answers on Conduction Heat Transfer—- Unsteady state conduction and thermal capacity of a system, Why is thermal conductivity low for Thermocole and Polyurethane foam (P U F)?, effect of temperature on thermal conductivity of liquids and gases Q. Discuss unsteady state conduction. When temperature varies with temperature. […]
*HEAT TRANSFER MECHANICAL ENGINEERING Short Interview Question Answers on Conduction Heat Transfer—-Basic laws which govern heat transfer, significance of heat transfer, Thermal conductivity, Thermal diffusivity, Change of thermal resistance of a slab, Condition for conduction to be one dimensional, Biot number, Conduction equation and thermal resistance in conduction and convection Q. List the basic laws […]
INTRODUCTION TO CONDUCTION Conduction is one of the three basic modes of heat transfer. The two other modes are convection and radiation. Thermal conduction takes place in solids and stationary fluids adhered to the solid surface. But the heat transfer by conduction in fluids is small because of smaller value of conductivity. Temperature difference is the […]