How does the thermal conductivity of a material change with respect to change in the temperature of the same material?

thermal conductivity of a material increases with an increase in its temperature

thermal conductivity of a material decreases with increase in its temperature

thermal conductivity of a material remains same with change in its temperature

Why is the negative sign introduced in the equation of Fourier's law of heat conduction? q = – kA (dT / dx)

because heat is transferred from higher temperature to lower temperature

because value of thermal conductivity k is negative

because heat transfer rate is inversely proportional to temperature gradient

What does a composite wall mean?

two walls of different materials are connected in series without any gap between them

three walls of different materials are connected in series without any gap between them

more than three walls of different materials are connected in series without any gap between them

Thermal conductivity of the same material varies with

the temperature of the material

thermal conductivity of the same material does not vary at all

The potential difference in an electrical system, is analogously considered as

a temperature difference in the heat transfer system

a current flow in the heat transfer system

a resistance in the heat transfer system

The current in the electrical system is analogous to

the heat flow in the heat transfer system

the temperature in the heat transfer system

the thermal conductance in the heat transfer system

the thermal resistance in the heat transfer system

What is the mode of heat transfer from the hot fluid surface to the adjacent layers of fluid surface?

conduction mode of heat transfer

radiation mode of heat transfer

convection mode of heat transfer

What is lumped heat capacity analysis?

the analysis of a system in which it is assumed to be at uniform temperature

the analysis of a system in which it is assumed to be at no uniform temperature

the analysis of a system in which it is assumed to be at either uniform or no uniform temperature

In transient heat conduction, the two significant dimensionless parameters are

Reynolds number and Fourier number

Reynolds number and Biot number

Reynolds number and Prandtl number

Rate of heat flow by convection doesn’t depend on

Convective heat transfer coefficient

Surface area through which heat flows

Temperature potential difference

Heat transfer takes place in liquids and gases is essentially due to

Conduction as well as convection

Generally, natural convection occurs due to

change in molecular structure of a fluid

The Nusselt modulus or Nusselt number is a convenient measure of

convective heat transfer coefficient

Prandtl number is the ratio of

kinematic viscosity (ν) to thermal diffusivity (α)

thermal diffusivity (α) to absolute viscosity (μ)

absolute viscosity (μ) to thermal diffusivity (α)

thermal diffusivity (α) to kinematic viscosity (ν)

Heat and Mass Transfer

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Heat and Mass Transfer

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Practice Problem

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Medium

Armstrong M

Used 30+ times

FREE Resource

40 questions

Show all answers

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Heat transfers from an area of __temperature to an area of _ temperature.

high to low

low to high

high to high

t can travel high to low and low to high.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Warm air is __________ dense than cold air and rises creating convection currents.

less

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Transfer of thermal or heat energy through "touch"

conduction

convection

radiation

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Fourier law of conduction

KAdT

KLdT/dX

-KAdT/dX

FILL IN THE BLANK QUESTION

45 sec • 1 pt

Internal Thermal Resistance (R) formula for single slab is

MULTIPLE CHOICE QUESTION

1 min • 1 pt

where L = 0.25 m and K= 387.6 W/mk, find Q in W/m²

0.155 x 10⁵

15.55 x 10³

0.155 x 10³

155 x 10³

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the value for R_BC

0.2343

0.1461

0.2545

0.4245

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Heat and Mass Transfer

40 questions

Heat transfers from an area of __temperature to an area of _ temperature.

Warm air is __________ dense than cold air and rises creating convection currents.

Transfer of thermal or heat energy through "touch"

Fourier law of conduction

Internal Thermal Resistance (R) formula for single slab is

where L = 0.25 m and K= 387.6 W/mk, find Q in W/m²

What is the value for R_BC

What is the Rbc formula in this diagram???

Near the ceiling of a room the air is warmer. The warm air rises because of...

A huge rock at the state park gets really hot during the day because of

Create a free account and access millions of resources

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Heat and Mass Transfer

40 questions

Heat transfers from an area of ____temperature to an area of ___ temperature.

Warm air is __________ dense than cold air and rises creating convection currents.

Transfer of thermal or heat energy through "touch"

Fourier law of conduction

Internal Thermal Resistance (R) formula for single slab is

where L = 0.25 m and K= 387.6 W/mk, find Q in W/m2

What is the value for RBC

What is the Rbc formula in this diagram???

Near the ceiling of a room the air is warmer. The warm air rises because of...

A huge rock at the state park gets really hot during the day because of

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Heat transfers from an area of __temperature to an area of _ temperature.

where L = 0.25 m and K= 387.6 W/mk, find Q in W/m²

What is the value for R_BC