NSc/NPr is called the______________________?

Related Mcqs:

1. The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?

   A. 1
   B. 0.5
   C. 10
   D. 0

2. According to Chilton-Colburn analogy for mass transfer, NSt.NSc 2/3 is equal to_________________?

   A. f
   B. f/2
   C. 2f
   D. 1/f

3. (NRe . NSc) is termed in mass transfer operation as the ______________ number?

   A. Stanton
   B. Sherwood
   C. Peclet
   D. None of these

4. (NSh/NRe.NSc) is termed in mass transfer operation as the __________________________?

   A. Stanton number
   B. Peclet number
   C. Thermal diffusivity
   D. Momentum diffusivity

5. Pick out the wrong statement. Raoult’s law does not apply, when the______________________?

   A. Size of component molecules are not equal
   B. Attractive forces between like and unlike molecules in the solution are approximately equal
   C. Component molecules are non-polar
   D. Chemical combination or molecular association between unlike molecules takes place in the
   formation of solution

6. The slope of 9-line is determined by the______________________?

   A. Reflux ratio
   B. Plate efficiency to be achieved
   C. Thermal condition of the feed
   D. Relative volatility

7. During constant rate period, the rate of drying decreases with the______________________?

   A. Decrease in air temperature
   B. Increase in air humidity
   C. Both A. and B.
   D. Neither A. nor B.

8. Relative humidity is the ratio of the______________________?

   A. Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
   B. Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
   C. Actual humidity to saturation humidity
   D. None of these

9. In an operating distillation column, the______________________?

   A. Vapors and liquids are at their dew point and bubble point respectively
   B. Driving force for the liquid flow is its specific weight
   C. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from
   the bottom to the top of the column
   D. Highest temperature is encountered at the top of the column

10. As the reflux ratio in a distillation column is increased from the minimum, the______________________?

    A. Slope of the operating line in stripping section decreases
    B. Number of plates decreases very slowly first and then more and more rapidly
    C. Total cost first decreases and then increases
    D. Liquid flow increases while the vapor flow decreases for a system