A. Zero
B. One
C. ∞
D. Between 0 and ∞
What is the thermal conductivity of a perfect heat insulator ? Read More »
Chemical Heat Transfer A. 5.6697 × 10-8W/m2.°K4
B. 0.1714 × 10-8W/m2.°K4
C. 5.6697 × 10-8kcal/m2. °K4
D. 0.1714 × 10-8kcal/m2. °K4
The value of Stefan-Boltzmann constant in SI unit is_________________? Read More »
Chemical Heat Transfer A. 5.6
B. 0.025
C. 3.5
D. 0.0035
A. Plate type
B. Double pipe type with fin on steam side
C. Double pipe type with fin on air side
D. Shell and tube type
Air is best heated with steam in a heat exchanger of__________________? Read More »
Chemical Heat Transfer A. Agitated film evaporator
B. Long tube vertical evaporator
C. Open pan evaporator
D. None of these
Which is the most suitable for the concentration of foamy & frothy liquors ? Read More »
Chemical Heat Transfer A. 1000
B. 727
C. 800
D. 1200
A. Increases rapidly with temperature rise
B. Decreases rapidly with temperature rise
C. In independent of pressure
D. Both B. and C.
Boiling point elevation of an ideal solution_______________? Read More »
Chemical Heat Transfer A. Facilitate the cleaning of outer tube surface
B. Enhance turbulence
C. Hold the tubes in position
D. All A , B & C
A. 10-50
B. 100-500
C. 1000-1500
D. 5000-15000
A. Wavelength of radiation
B. Nature of the body
C. Temperature of the body
D. None of these
