Unsteady state heat conduction occurs, when_______________?

Byadmin March 3, 2019August 24, 2021

Unsteady state heat conduction occurs, when_______________?

A. Temperature distribution is independent of time
B. Temperature distribution is dependent on time
C. Heat flows in one direction only
D. Three dimensional heat flow is concerned

Chemical Heat Transfer

Heat transfer occurs by natural convection because change in temperature causes difference in__________________?

Heat transfer occurs by natural convection because change in temperature causes difference in__________________?

A. Viscosity
B. Density
C. Thermal conductivity
D. Heat capacity

Read More Heat transfer occurs by natural convection because change in temperature causes difference in__________________?
Chemical Heat Transfer

Thermal conductivity of a gas at low density, ___________ with increase in temperature ?

Thermal conductivity of a gas at low density, ___________ with increase in temperature ?

A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease; depends on the gas

Read More Thermal conductivity of a gas at low density, ___________ with increase in temperature ?
Chemical Heat Transfer

200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?

200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?

A. 0.5
B. 0.05
C. 0.1
D. 0.15

Read More 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?
Chemical Heat Transfer

Air is best heated with steam in a heat exchanger of__________________?

Air is best heated with steam in a heat exchanger of__________________?

A. Plate type
B. Double pipe type with fin on steam side
C. Double pipe type with fin on air side
D. Shell and tube type

Read More Air is best heated with steam in a heat exchanger of__________________?
Chemical Heat Transfer

A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?

A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?

A. 125
B. 133
C. 150
D. 160

Read More A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?
Chemical Heat Transfer

Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?

Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?

A. Corrosiveness & fouling characteristics
B. Pressure
C. Viscosity
D. Density

Read More Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?

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