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

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

A. Decreases
B. Increases
C. Remains unchanged
D. Increases exponentially

Read More For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?
Chemical Heat Transfer

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?

A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?

A. Condensation
B. Grashoff
C. Stanton
D. Brinkman

Read More A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?
Chemical Heat Transfer

In a gas-liquid shell and tube heat exchanger, the_________________?

In a gas-liquid shell and tube heat exchanger, the_________________?

A. Presence of a non-condensable gas decreases the condensing film co-efficient
B. Gases under high pressure are routed through the tube side, because high pressure gases are
corrosive in nature
C. Gases to be heated/cooled is normally routed through the shell side, because the corrosion
caused by the cooling water or steam condensate remain localised to the tubes
D. All A, B. & C.

Read More In a gas-liquid shell and tube heat exchanger, the_________________?
Chemical Heat Transfer

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?

A. Forced convection
B. Natural convection
C. Transient conduction
D. Steady state conduction

Read More The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?
Chemical Heat Transfer

What is the emissivity of a black body ?

What is the emissivity of a black body ?

A. 0
B. 1
C. 0.5
D. 0.90

Read More What is the emissivity of a black body ?
Chemical Heat Transfer

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

A. Δt
B. Δt2
C. Δt3
D. √(Δt)

Read More For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

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