HEAT TRANSFER QUIZ

Viscosity of liquid is highest in first effect

No pump is required to withdraw the product from the last effect

None of these

Transfer from effect to effect is done by pumps

Vent the non-condensible gases

Regulate the vapor flow

Create vacuum

Arrest the entrained liquid

Temperature difference to the temperature gradient at the wall

Heat flux at the wall to that across the entire pipe

None of these

Temperature gradient of the wall to that across the entire pipe

Temperature of the heating surface is less than the boiling point of the liquid

Very large vapour space is necessary

Temperature of the heating surface is more than the boiling point of the liquid

Bubbles from heating surface are absorbed by the mass of the liquid

5.6697 x 10-8W/m².°K4

0.1714 x 10-8W/m².°K4

5.6697 x 10-8kcal/m² . °K4

0.1714 x 10-8kcal/m². °K4

decreased capacity

increased true temperature drop

increase in liquor film co-efficient

decreased effect of hydrostatic head

Isothermal

Neither A and B

Non-isothermal

Both A and B

4600

3000

4000

9000

Higher steam economy

Higher solute concentration in the product

Lower heat transfer area

Lower steam economy

dT/dZ = 0

d²T/dZ² < 0

d²T/dZ² > 0

d²T/dZ² = 0