For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser?

Related Mcqs:

1. Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________?

   A. Same
   B. Less
   C. About 3 times
   D. About 0.33 times

2. Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________?

   A. Hydrostatic head is required for refluxing the condensate
   B. Only the function of condensation is to be carried out
   C. Sub-cooling of condensate is desired
   D. Both the functions of condensation & sub cooling are carried out in a single unit

3. Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?

   A. CO2
   B. SO2
   C. NH3
   D. None of these

4. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of_____________?

   A. 1000
   B. 3000
   C. 5000
   D. 10000

5. Diameter of bubble caps used in high pressure columns is ______________ as compared to that used in identical vacuum columns?

   A. Less
   B. More
   C. Same
   D. Either A. or B.; no generalisation can be made

6. In condenser, the cooling water is passed in the tube side in a pass arrangement, because________________?

   A. It reduces heat transfer area
   B. More thinner tubes can be used
   C. Pressure drop is reduced
   D. It makes condenser compact

7. For identical operating conditions, the pressure drop over _______________ tray is the highest out of the following?

   A. Sieve
   B. Valve
   C. Counter flow
   D. Bubble cap

8. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always ?

   A. 1
   B. < 1
   C. > 1
   D. Equal to the order of reaction

9. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?

   A. 2
   B. 20.8
   C. 20.2
   D. None of these

10. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?

    A. ∞
    B. 1
    C. 20.8
    D. 2