Graetz number is given by__________________?
Graetz number is given by__________________?
A. mCp/kL
B. kL/mCp
C. mCp/kμ
D. kμ/mCp
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As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?A. Continues to increase
B. Continues to decrease
C. Goes through a minimum
D. Goes through a maximumVacuum is generally maintained in the vapour space of an evaporator mainly to__________________?
Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final productMultiple effect evaporators ar used to___________________?
Multiple effect evaporators ar used to___________________?A. Increase the steam economy & decrease the capacity
B. Increase the steam economy & the capacity
C. Decrease the steam economy & the capacity
D. Decrease the steam economy & increase the capacityPeclet number (Pe) is given by____________________?
Peclet number (Pe) is given by____________________?A. Pe = Re.Pr
B. Pe = Re/Pr
C. Pe = Pr/Re
D. Pe = Nu.ReA wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?
A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?A. 6
B. 12
C. 18
D. 24In sub-cooled boiling ?
In sub-cooled boiling ?A. Temperature of the heating surface is less than the boiling point of the liquid
B. Temperature of the heating surface is more than the boiling point of the liquid
C. Bubbles from heating surface are absorbed by the mass of the liquid
D. Very large vapour space is necessary