Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by whitelisting our website.

Chemical Heat Transfer

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?

Chemical Heat Transfer /
The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?

A. Its evaporation loss
B. Excessive corrosion
C. Uneconomic LMTD
D. Decrease in heat exchanger efficiency

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________? Read More »

Chemical Heat Transfer

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

Chemical Heat Transfer /
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

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

Chemical Heat Transfer

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?

Chemical Heat Transfer /
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?

A. Cube
B. Cylinder
C. Sphere
D. Equal for all the three

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________? Read More »

Chemical Heat Transfer

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

Chemical Heat Transfer /
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

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

Chemical Heat Transfer

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?

Chemical Heat Transfer /
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?

A. hf = hd
B. hf > hd
C. hf < hd
D. hf could be greater or smaller than hd

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________? Read More »

Chemical Heat Transfer

_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?

Chemical Heat Transfer /
_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?

A. Single pass, fixed tube sheet
B. U-tube
C. Three pass, fixed tube sheet
D. None of these

_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side? Read More »

Chemical Heat Transfer