Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k. (dT/dx)

k. A. (dx/dT)

k. (dx/dT)

k. A. (dT/dx)

k. (dT/dx)

k. A. (dx/dT)

k. (dx/dT)

k. A. (dT/dx)

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

None of these

Conduction

Convection

Radiation

None of these

Conduction

Convection

Radiation

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Thermal diffusivity is

A physical property of the material

Used as mathematical model

Function of temperature

A dimensionless parameter

A physical property of the material

Used as mathematical model

Function of temperature

A dimensionless parameter

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Counter flow

Parallel flow

Cross flow

All of these

Counter flow

Parallel flow

Cross flow

All of these

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

P = 0, x = 0 and a = 1

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 1 and a = 0

P = 0, x = 0 and a = 1

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 1 and a = 0

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Water

Steam

Melting ice

Solid ice

Water

Steam

Melting ice

Solid ice

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Heat and Mass Transfer Thermal diffusivity is

Heat and Mass Transfer In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Heat and Mass Transfer Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer Which of the following is expected to have highest thermal conductivity?

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Heat and Mass Transfer
Thermal diffusivity is

Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?