In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?

Byadmin March 3, 2019August 24, 2021

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?

A. Minimum
B. Maximum
C. Zero
D. Infinity

Chemical Heat Transfer

Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?

Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?

A. For fluids in laminar flow
B. For fluids in turbulent flow
C. When Grashoff number is very important
D. For liquid metals

Read More Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ___________________?
Chemical Heat Transfer

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?

A. (ΔT)1/4
B. (ΔT)1/2
C. (ΔT)5/4
D. (ΔT)3/4

Read More The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?
Chemical Heat Transfer

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because__________________?

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because__________________?

A. Total heat transfer area of all the effects is -less than that in a single effect evaporator system
B. Total amount of vapor produced per Kg of feed steam in a multiple effect system is much
higher than in a single effect
C. Boiling point elevation in a single effect system is much higher than that in any effect in a
multi-effect system
D. Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect
system

Read More A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because__________________?
Chemical Heat Transfer

Tube pitch is the _______________ of tube diameters and the clearances?

Tube pitch is the _______________ of tube diameters and the clearances?

A. Sum
B. Difference
C. Ratio
D. None of these

Read More Tube pitch is the _______________ of tube diameters and the clearances?
Chemical Heat Transfer

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

A. 1
B. 1
D. None of these

Read More At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?
Chemical Heat Transfer

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

A. Peclet
B. Prandtl
C. Stanton
D. Nusselt

Read More The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?

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