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18 Questions

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Forced Convection in Heat Transfer

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Questions and Answers

What is the primary mechanism of heat transfer in the cooling system of an automobile engine?

Radiation

Natural Convection

Forced Convection (correct)

Conduction

What is the relationship between the surface area and the amount of heat transferred through convection?

The heat transferred is inversely proportional to the surface area

The heat transferred is directly proportional to the surface area (correct)

The heat transferred is proportional to the square root of the surface area

The heat transferred is independent of the surface area

What is the Stefan-Boltzmann constant?

5.67 × 10^4 W/(m·K^4)

5.67 × 10^8 W/(m^2·K^4)

5.67 × 10^-8 W/(m^2·K^4) (correct)

5.67 × 10^4 W/(m^2·K^4)

What is the purpose of a thermos bottle?

To minimize heat transfer through conduction, convection, and radiation Signup and view all the answers

What is the term for a material that absorbs all incoming radiation?

Perfect Blackbody Signup and view all the answers

What is the mechanism by which a halogen cooktop stove transfers energy to a pot?

Radiation Signup and view all the answers

What is the primary mechanism of heat transfer in conduction?

Collisions between energetic and less energetic molecules Signup and view all the answers

What is the term for materials that conduct heat poorly?

Thermal insulators Signup and view all the answers

What is the unit of thermal conductivity?

J/(s·m·Co) Signup and view all the answers

What is the type of convection that occurs due to a difference in density in a fluid?

Natural convection Signup and view all the answers

What is the name for updrafts of air used by glider pilots to gain altitude?

Thermals Signup and view all the answers

What is the factor that does NOT affect the amount of heat conducted through a bar?

Color of the bar Signup and view all the answers

What is the relationship between the heat lost by the hotter object and the heat gained by the cooler object in a calorimetry process, assuming no heat loss to the surroundings?

The heat lost by the hotter object is equal to the heat gained by the cooler object. Signup and view all the answers

What determines the value of the specific heat of a gas?

The pressure or volume of the gas Signup and view all the answers

What is the unit of latent heat in the SI system?

J/kg Signup and view all the answers

What happens to the temperature of a mixture during a phase change, provided the system is in thermal equilibrium?

The temperature of the mixture remains constant Signup and view all the answers

What is the best approach to cook spaghetti in an open pot with the least amount of energy?

Turn down the burner so the water barely boils Signup and view all the answers

If sphere A has a specific heat capacity of 645 J/(kg · C°) and sphere B has a specific heat capacity of 240 J/(kg · C°), which sphere will heat up faster?

Sphere B Signup and view all the answers