Chemical Heat Transfer

It is not preferable to use superheated steam in evaporators, because of its very_________________?

Byadmin March 2, 2019August 24, 2021

It is not preferable to use superheated steam in evaporators, because of its very_________________?

A. High temperature
B. High pressure
C. Low film co-efficient
D. None of these

Chemical Heat Transfer

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?

A. t = 283 s
B. t = 356 s
C. t = 400 s
D. t = 800 s

Read More A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?
Chemical Heat Transfer

Heat waves_____________________?

Heat waves_____________________?

A. Cannot pass through vacuum
B. Travel in straight line
C. Can be reflected by a mirror
D. Both B. and C.

Read More Heat waves_____________________?
Chemical Heat Transfer

‘Duhring’s plot’ is of use in_________________?

‘Duhring’s plot’ is of use in_________________?

A. Extractive distillation
B. Evaporation
C. Leaching
D. Absorption

Read More ‘Duhring’s plot’ is of use in_________________?
Chemical Heat Transfer

Thermal diffusivity is given by__________________?

Thermal diffusivity is given by__________________?

A. k/ρCp
B. ρCp/k
C. μCp/a
D. μ/hCp

Read More Thermal diffusivity is given by__________________?
Chemical Heat Transfer

Prandtl number for most of dry gases is about________________?

Prandtl number for most of dry gases is about________________?

A. 0.001
B. 0.72
C. 70
D. 150

Read More Prandtl number for most of dry gases is about________________?
Chemical Heat Transfer

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

A. Varies directly as the area and the LMTD
B. Directly proportional to LMTD and inversely proportional to the area
C. Varies as square of the area
D. None of these

Read More In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?

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