Moisture would find its way into insulation by vapour pressure unless it is prevented by

Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

High vapour pressure

Less thermal conductivity insulator

High thickness of insulation

A vapour seal

High vapour pressure

Less thermal conductivity insulator

High thickness of insulation

A vapour seal

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Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Same

Less

Greater

None of these

Same

Less

Greater

None of these

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Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

All of these

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

All of these

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Does not affect the intervening medium

Affect the intervening medium

Move actually

Do not move actually

Does not affect the intervening medium

Affect the intervening medium

Move actually

Do not move actually

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Either (A) or (B)

Directly proportional to the difference of temperatures between the two bodies

Both (A) and (B)

Directly proportional to the surface area

Either (A) or (B)

Directly proportional to the difference of temperatures between the two bodies

Both (A) and (B)

Directly proportional to the surface area

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Inversely proportional to

None of these

Equal to

Directly proportional to

Inversely proportional to

None of these

Equal to

Directly proportional to

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Heat and Mass Transfer

Heat and Mass Transfer Moisture would find its way into insulation by vapour pressure unless it is prevented by

Heat and Mass Transfer In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Heat and Mass Transfer Thermal conductivity of a material may be defined as the

Heat and Mass Transfer The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat and Mass Transfer The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.