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Heat Transfer

The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

Heat Transfer /
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

A. emissivity
B. transmissivity
C. reflectivity
D. intensity of radiation
E. absorptivity

The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________? Read More »

Heat Transfer

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

Heat Transfer /
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

A. convection
B. radiation
C. conduction
D. both convection and conduction
E. none of the above

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________? Read More »

Heat Transfer

Film coefficient is defined as Inside diameter of tube________________?

Heat Transfer /
Film coefficient is defined as Inside diameter of tube________________?

A. Equivalent thickness of film
B. Thermal conductivity Equivalent thickness of film Specific heat x Viscocity
C. Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity
D. Film coefficient x Inside diameter Thermalconductivity
E. none of the above

Film coefficient is defined as Inside diameter of tube________________? Read More »

Heat Transfer

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

Heat Transfer /
Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?

A. high thickness of insulation
B. high vapour pressure
C. less thermal conductivity insulator
D. a vapour seal
E. all of the above

Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ? Read More »

Heat Transfer