Presence of a non-condensing gas in a condensing vapour___________________?

Byadmin March 2, 2019August 24, 2021

Presence of a non-condensing gas in a condensing vapour___________________?

A. Increases the rate of condensation
B. Decreases thermal resistance
C. Is desirable to increase the film co-efficient
D. None of these

Chemical Heat Transfer

Steam trap is used to_________________?

Steam trap is used to_________________?

A. Condense the steam flowing in the pipeline
B. Remove water resulting from partial condensation of steam
C. Stop the supply of steam
D. None of these

Read More Steam trap is used to_________________?
Chemical Heat Transfer

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

A. 0.35
B. 0.45
C. 0.55
D. 0.85

Read More Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?
Chemical Heat Transfer

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?

A. 1
B. 2
C. 1/2
D. 4

Read More If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is_________________?
Chemical Heat Transfer

A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?

A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?

A. 6
B. 12
C. 18
D. 24

Read More A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?
Chemical Heat Transfer

Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?

Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?

A. Square pitch
B. Triangular pitch
C. Diagonal square pitch
D. None of these

Read More Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
Chemical Heat Transfer

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

A. Dittus-Boelter equation
B. Sieder-Tate equation
C. Nusselt equation
D. None of these

Read More Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?

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