A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

20°C

60°C

40°C

66.7°C

20°C

60°C

40°C

66.7°C

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Heat and Mass Transfer
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

Thermal conductivity

None of these

Thermal coefficient

Thermal resistance

Thermal conductivity

None of these

Thermal coefficient

Thermal resistance

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Better insulation should be put over pipe and better one over it

Whether to put inferior OIL over pipe or the better one would depend on steam temperature

Both may be put in any order

Inferior insulation should be put over pipe and better one over it

Better insulation should be put over pipe and better one over it

Whether to put inferior OIL over pipe or the better one would depend on steam temperature

Both may be put in any order

Inferior insulation should be put over pipe and better one over it

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

High thickness of insulation

High vapour pressure

Less thermal conductivity insulator

A vapour seal

High thickness of insulation

High vapour pressure

Less thermal conductivity insulator

A vapour seal

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Heat and Mass Transfer
The radiation emitted by a black body is known as

Total radiation

Full radiation

All of these

Black radiation

Total radiation

Full radiation

All of these

Black radiation

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = ρS/k

h = kρ/S

h = k/ ρS

h = S/ρk

h = ρS/k

h = kρ/S

h = k/ ρS

h = S/ρk

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Heat and Mass Transfer

Heat and Mass Transfer The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

Heat and Mass Transfer A steam pipe is to be insulated by two insulating materials put over each other. For best results

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

Heat and Mass Transfer The radiation emitted by a black body is known as

Heat and Mass Transfer Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

Heat and Mass Transfer
The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as

Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

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

Heat and Mass Transfer
The radiation emitted by a black body is known as

Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)