Pick out the wrong statement pertaining to the cooling towers ?

Related Mcqs:

1. Pick out the wrong statement pertaining to the cooling towers ?

   A. In case of induced draft cooling tower, the fan is placed at the top of the tower
   B. Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and
   hot discharged air
   C. A natural draft cooling tower is recommended to be used, when the air humidity is low and air
   temperature is also low
   D. Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb
   temperature

2. The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?

   A. Low pressure drop and high hold up
   B. High pressure drop and low hold up
   C. Low pressure drop and low hold up
   D. High pressure drop and high hold up

3. Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?

   A. Packing may be crushed due to thermal expansion/contraction of the components of the
   equipments
   B. Pressure drop in the equipment will be very high
   C. Viscosity variation of the fluids may cause channelling/flooding
   D. None of these

4. Pick out the wrong statement pertaining to the analogy between equations of heat and mass_________________?

   transfer operations.
   A. Sherwood number in mass transfer is analogous to Nusselt number in heat transfer
   B. Prandtl number in heat transfer is analogous to Schmidt number in mass transfer
   C. Reynolds number in mass transfer is analogous to Grashoff number in heat transfer
   D. Reynolds number remains the same in both heat and mass transfer

5. Pick out the wrong statement pertaining to the rotary dryer ?

   A. Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it
   down through the current of hot air/gases. It extends from the wall to a distance which is about
   8-12% of the inside diameter of shell
   B. Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at
   any instant. The best performance for rotary drier is obtained, when the hold up is in the range
   of 0.05 to 0.15
   C. Rotary dryer is suitable for drying sticky material
   D. Recommended peripheral speed of a rotary drier is in the range of 10 to 30 metres/minute

6. Pick out the wrong statement pertaining to leaching ?

   A. Fine solids cannot be leached in a Pachuca tank
   B. Door classifier can be used for leaching of coarse solids
   C. Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
   D. Very high temperature is not needed for the leaching of sugar beet

7. In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ?

   A. Lewis
   B. Grashoff
   C. Sherwood
   D. None of these

8. Water entrained by circulating air in cooling towers is termed as________________?

   A. Drift
   B. Blow down
   C. Vapor load
   D. None of these

9. Water entrained by circulating air in cooling towers is termed as____________________?

   A. Drift
   B. Blow down
   C. Vapor load
   D. None of these

10. The cooling effect in a cooling tower cannot be increased by_____________________?

    A. Increasing the air velocity over the wet surfaces
    B. Reducing the humidity of entering air
    C. Lowering the barometric pressure
    D. None of these