Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?

Related Mcqs:

1. It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?

   A. 3.06 × 105
   B. 6.12 × 105
   C. 7.24 × 105
   D. 9.08 × 105

2. Boiling point of a solution according to Duhring’s rule is a linear function of the _____________ of water?

   A. Boiling point (at the same pressure)
   B. Viscosity
   C. Density
   D. Thermal conductivity

3. Boiling point elevation of a solution of NaOH _____________________?

   A. Increases rapidly with temperature rise
   B. Is almost independent of temperature
   C. Is almost independent of pressure
   D. Both B. and C

4. 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

5. In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

   A. Nucleate
   B. Local
   C. Pool
   D. Saturated

6. In a multiple effect evaporator, the effect of boiling point elevation is to______________________?

   A. Reduce the capacity
   B. Reduce the economy
   C. Increase the economy
   D. None of these

7. Boiling point elevation of an ideal solution_______________?

   A. Increases rapidly with temperature rise
   B. Decreases rapidly with temperature rise
   C. In independent of pressure
   D. Both B. and C.

8. Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?

   A. Scaling
   B. Highly viscous
   C. Corrosive
   D. Salty

9. Which is the most suitable for the concert-ration of highly concentrated solution ?

   A. Open pan evaporation
   B. Long tube vertical evaporator
   C. Agitated film evaporator
   D. None of these

10. Boiling of milk in an open vessel is an example of ______________ boiling?

    A. Film
    B. Sub-cooled
    C. Saturated nucleate
    D. None of these