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

66.7°C

40°C

20°C

60°C

66.7°C

40°C

20°C

60°C

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Heat and Mass Transfer
Thermal diffusivity of a substance is

Directly proportional to the thermal conductivity

Inversely proportional to density of substance

Inversely proportional to specific heat

All of these

Directly proportional to the thermal conductivity

Inversely proportional to density of substance

Inversely proportional to specific heat

All of these

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Prandtl number and Reynold number

Grashoff number and Reynold number

Grashoff number and Prandtl number

Grashoff number, Prandtl number and Reynold number

Prandtl number and Reynold number

Grashoff number and Reynold number

Grashoff number and Prandtl number

Grashoff number, Prandtl number and Reynold number

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Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Wine’s law

Stefan’s law

Planck’s law

Kirchhoff’s law

Wine’s law

Stefan’s law

Planck’s law

Kirchhoff’s law

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Heat and Mass Transfer
The critical temperature is the temperature

Above which a gas may explode

Below which a gas is always liquefied

Below which a gas does not obey gas laws

Above which a gas will never liquefied

Above which a gas may explode

Below which a gas is always liquefied

Below which a gas does not obey gas laws

Above which a gas will never liquefied

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Wavelength has nothing to do with it

Remain same at all wavelengths

Shorter wavelength

Longer wavelength

Wavelength has nothing to do with it

Remain same at all wavelengths

Shorter wavelength

Longer wavelength

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Heat and Mass Transfer

Heat and Mass Transfer Thermal diffusivity of a substance is

Heat and Mass Transfer In free convection heat transfer, Nusselt number is function of

Heat and Mass Transfer The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer The critical temperature is the temperature

Heat and Mass Transfer The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Heat and Mass Transfer
Thermal diffusivity of a substance is

Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer
The critical temperature is the temperature

Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of