Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal coefficient

Temperature gradient

Thermal conductivity

Thermal resistance

Thermal coefficient

Temperature gradient

Thermal conductivity

Thermal resistance

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Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction and convection

Radiation

Conduction

Convection

Conduction and convection

Radiation

Conduction

Convection

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Four

Three

Two

One

Four

Three

Two

One

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Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

Same

Depends on other factors

More

Less

Same

Depends on other factors

More

Less

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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 one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

All of these

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

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 one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

All of these

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

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
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number

Reynold's number, Grashoff's number

Prandtl number, Grashoff's number

Grashoff's number

Reynold's number

Reynold's number, Grashoff's number

Prandtl number, Grashoff's number

Grashoff's number

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Heat and Mass Transfer

Heat and Mass Transfer Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Heat and Mass Transfer Log mean temperature difference in case of counter flow compared to parallel flow will be

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

Heat and Mass Transfer In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Heat and Mass Transfer
Log mean temperature difference in case of counter flow compared to parallel flow will be

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

Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the