Which mode of heat transfer does not require a medium to propagate?
a) Conduction
b) Convection
c) Radiation
d) Advection
Answer: c) Radiation
In which mode of heat transfer does heat transfer occur due to the movement of fluid particles?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: b) Convection
What is the process of heat transfer through direct contact between molecules called?
a) Conduction
b) Convection
c) Radiation
d) Conduction and convection
Answer: a) Conduction
Which material typically exhibits the highest thermal conductivity?
a) Plastic
b) Wood
c) Copper
d) Air
Answer: c) Copper
Which law of thermodynamics states that heat always flows from a higher temperature object to a lower temperature object?
a) First law of thermodynamics
b) Second law of thermodynamics
c) Third law of thermodynamics
d) Zeroth law of thermodynamics
Answer: b) Second law of thermodynamics
Which type of heat exchanger involves two fluids flowing in opposite directions?
a) Parallel flow
b) Counterflow
c) Crossflow
d) Mixed flow
Answer: b) Counterflow
What is the SI unit of thermal conductivity?
a) Watts per meter per kelvin (W/m·K)
b) Joules per second (J/s)
c) Newton (N)
d) Kilogram per cubic meter (kg/m³)
Answer: a) Watts per meter per kelvin (W/m·K)
Which property of a material determines how much heat it can store per unit mass per degree change in temperature?
a) Thermal conductivity
b) Specific heat capacity
c) Thermal diffusivity
d) Heat flux
Answer: b) Specific heat capacity
What is the term for the process of reducing heat transfer by trapping air in a material?
a) Conduction
b) Convection
c) Insulation
d) Radiation
Answer: c) Insulation
Which phenomenon explains why metals feel cold to touch at room temperature?
a) Conduction
b) Convection
c) Radiation
d) Absorption
Answer: a) Conduction
Which mode of heat transfer involves the transfer of energy by electromagnetic waves?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: c) Radiation
Which type of material is an effective thermal insulator?
a) Metals
b) Glass
c) Plastics
d) Copper
Answer: c) Plastics
What is the process by which heat is transferred within a solid material without any movement of the material itself?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: a) Conduction
Which law states that the rate of heat transfer through a material is proportional to the temperature difference across the material and inversely proportional to the thickness?
a) Fourier’s law of heat conduction
b) Newton’s law of cooling
c) Stefan-Boltzmann law
d) Planck’s law
Answer: a) Fourier’s law of heat conduction
What is the term for the total heat transfer per unit area per unit time by convection from a surface to the fluid?
a) Heat flux
b) Thermal conductivity
c) Heat transfer coefficient
d) Specific heat
Answer: c) Heat transfer coefficient
Which factor affects the rate of convective heat transfer between a solid surface and a fluid?
a) Thermal conductivity of the solid
b) Thickness of the solid
c) Type of fluid
d) Size of the solid
Answer: c) Type of fluid
Which law of thermodynamics states that energy cannot be created or destroyed, only transformed or transferred?
a) First law of thermodynamics
b) Second law of thermodynamics
c) Third law of thermodynamics
d) Zeroth law of thermodynamics
Answer: a) First law of thermodynamics
What does the term ’emissivity’ refer to in radiation heat transfer?
a) Ability of a material to absorb radiation
b) Ability of a material to conduct heat
c) Ability of a material to emit radiation
d) Ability of a material to store heat
Answer: c) Ability of a material to emit radiation
Which law of radiation states that the radiant energy emitted by a perfect blackbody is proportional to the fourth power of its absolute temperature?
a) Wien’s displacement law
b) Stefan-Boltzmann law
c) Planck’s law
d) Kirchhoff’s law
Answer: b) Stefan-Boltzmann law
Which type of heat exchanger involves fluids flowing at right angles to each other?
a) Parallel flow
b) Counterflow
c) Crossflow
d) Mixed flow
Answer: c) Crossflow
Which material property affects the rate of radiative heat transfer?
a) Conductivity
b) Diffusivity
c) Absorptivity
d) Thermal expansion
Answer: c) Absorptivity
What is the term for the rate of heat transfer through a unit area of a material for a given temperature difference?
a) Heat flux
b) Thermal conductivity
c) Heat transfer coefficient
d) Specific heat
Answer: a) Heat flux
Which type of heat transfer involves the movement of energy due to the movement of fluid particles?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: b) Convection
Which law of radiation states that for every absorbing surface, there is an equivalent amount of emitting surface?
a) Kirchhoff’s law
b) Wien’s displacement law
c) Planck’s law
d) Stefan-Boltzmann law
Answer: a) Kirchhoff’s law
What is the term for the process by which heat is transferred by the circulation or movement of a fluid?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: b) Convection
Which material property indicates how quickly heat can travel through a material?
a) Specific heat capacity
b) Thermal conductivity
c) Thermal diffusivity
d) Heat transfer coefficient
Answer: b) Thermal conductivity
What is the term for the rate of heat transfer through a material due to a temperature difference across the material?
a) Heat flux
b) Thermal conductivity
c) Heat transfer coefficient
d) Specific heat
Answer: a) Heat flux
Which law states that the direction of heat transfer is from higher temperature to lower temperature?
a) First law of thermodynamics
b) Second law of thermodynamics
c) Third law of thermodynamics
d) Zeroth law of thermodynamics
Answer: b) Second law of thermodynamics
What is the term for the rate of heat transfer per unit area by conduction through a material, for a unit thickness and unit temperature difference?
a) Heat flux
b) Thermal conductivity
c) Heat transfer coefficient
d) Specific heat
Answer: b) Thermal conductivity
Which term describes the process of reducing heat transfer by trapping air in a material?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: d) Insulation
Which law of thermodynamics states that energy cannot be created or destroyed, only transformed or transferred?
a) First law of thermodynamics
b) Second law of thermodynamics
c) Third law of thermodynamics
d) Zeroth law of thermodynamics
Answer: a) First law of thermodynamics
What is the process by which heat is transferred through direct contact between molecules of a material?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: a) Conduction
Which law of radiation states that the total energy emitted by a perfect blackbody is proportional to the fourth power of its absolute temperature?
a) Wien’s displacement law
b) Stefan-Boltzmann law
c) Planck’s law
d) Kirchhoff’s law
Answer: b) Stefan-Boltzmann lawWhich material property indicates how quickly heat can travel through a material?
a) Thermal diffusivity
b) Specific heat capacity
c) Thermal conductivity
d) Heat transfer coefficient
Answer: c) Thermal conductivity
Which type of heat exchanger involves fluids flowing in the same direction?
a) Parallel flow
b) Counterflow
c) Crossflow
d) Mixed flow
Answer: a) Parallel flow
What is the term for the ability of a material to emit radiation?
a) Absorptivity
b) Emissivity
c) Reflectivity
d) Conductivity
Answer: b) Emissivity
Which law of thermodynamics states that heat cannot spontaneously flow from a colder location to a hotter location?
a) First law of thermodynamics
b) Second law of thermodynamics
c) Third law of thermodynamics
d) Zeroth law of thermodynamics
Answer: b) Second law of thermodynamics
What is the term for the process by which electromagnetic waves travel through space and transfer heat?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: c) Radiation
Which type of material absorbs heat without undergoing a change in temperature?
a) Insulator
b) Conductor
c) Latent heat material
d) Phase change material
Answer: d) Phase change material
Which phenomenon allows a thermos bottle to keep liquids hot or cold for extended periods?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: d) Insulation
What is the term for the rate of heat transfer per unit area from one side of a material to the other, for a given temperature difference?
a) Heat flux
b) Thermal conductivity
c) Heat transfer coefficient
d) Specific heat
Answer: a) Heat flux
Which property of a material determines how much energy it can absorb from incident radiation?
a) Absorptivity
b) Emissivity
c) Reflectivity
d) Conductivity
Answer: a) Absorptivity
Which law of thermodynamics states that energy cannot be created or destroyed, only transformed or transferred?
a) First law of thermodynamics
b) Second law of thermodynamics
c) Third law of thermodynamics
d) Zeroth law of thermodynamics
Answer: a) First law of thermodynamics
What is the term for the rate of heat transfer per unit area per unit temperature difference across a material?
a) Heat flux
b) Thermal conductivity
c) Heat transfer coefficient
d) Specific heat
Answer: c) Heat transfer coefficient
Which type of heat exchanger involves fluids flowing perpendicular to each other?
a) Parallel flow
b) Counterflow
c) Crossflow
d) Mixed flow
Answer: c) Crossflow
What is the term for the measure of the capacity of a material to conduct heat?
a) Thermal conductivity
b) Specific heat capacity
c) Thermal diffusivity
d) Heat transfer coefficient
Answer: a) Thermal conductivity
Which law of radiation states that the wavelength of maximum emission of a blackbody is inversely proportional to its absolute temperature?
a) Wien’s displacement law
b) Stefan-Boltzmann law
c) Planck’s law
d) Kirchhoff’s law
Answer: a) Wien’s displacement law
What is the term for the total heat transfer per unit area by radiation from a surface to its surroundings?
a) Heat flux
b) Thermal conductivity
c) Emissivity
d) Radiosity
Answer: d) Radiosity
Which mode of heat transfer occurs when heat is transferred through a solid material without any movement of the material itself?
a) Conduction
b) Convection
c) Radiation
d) Insulation
Answer: a) Conduction
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