The thermal diffusivities for gases are generally

Heat and Mass Transfer
The thermal diffusivities for gases are generally

Dependent on the viscosity

More than those for liquids

Less than those for liquids

More than those for solids

Dependent on the viscosity

More than those for liquids

Less than those for liquids

More than those for solids

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

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

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

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Dual or double method

Velocity reduction method

Static regains method

Equal friction method

Dual or double method

Velocity reduction method

Static regains method

Equal friction method

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Regenerator type

Counter flow type

Cross flow type

Parallel flow type

Regenerator type

Counter flow type

Cross flow type

Parallel flow type

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Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Opaque body

Grey body

Black body

White body

Opaque body

Grey body

Black body

White body

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Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heat received by a person from fireplace

Blast furnace

Cooling of parts in furnace

Heating of building

Heat received by a person from fireplace

Blast furnace

Cooling of parts in furnace

Heating of building

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Heat and Mass Transfer

Heat and Mass Transfer The thermal diffusivities for gases are generally

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

Heat and Mass Transfer The most commonly used method for the design of duct size is the

Heat and Mass Transfer The automobile radiator is a heat exchanger of

Heat and Mass Transfer When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Heat and Mass Transfer Which of the following is the case of heat transfer by radiation?

Heat and Mass Transfer
The thermal diffusivities for gases are generally

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

Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?