Sand is dried in foundries in a ______________________drier?

Related Mcqs:

1. A 25 cm × 25 cm × 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m × 1m × 1cm flat sheet of the same material is to be dried from one side only. Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is ____________________?

   A. 1000
   B. 1500
   C. 2000
   D. 2500

2. A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?

   A. Spray dryer
   B. Drum dryer
   C. Rotary dryer
   D. Dielectric dryer

3. Dried finished product sampled from various parts of a ________________ dryer exhibits nonuniformity in the moisture content?

   A. Rotary
   B. Tray
   C. Freeze
   D. None of these

4. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?

   A. M(Xo – XF)
   B. M(Xo/XF)
   C. M ln(Xo/XF)
   D. MXo ln(Xo/XF)

5. Free flowing granular materials can be best dried in a __________________ drier?

   A. Rotary
   B. Cylinder
   C. Drum
   D. Freeze

6. Calcium ammonium nitrate (a fertiliser) is dried in a _________________ dryer?

   A. Rotary
   B. Vacuum
   C. Tunnel
   D. Tray

7. Detergent solution is dried to a powder in a ________________________?

   A. Spray dryer
   B. Spouted bed dryer
   C. Tunnel dryer
   D. Pan open to atmosphere

8. In paper industry, paper is dried in a _____________ dryer ?

   A. Tunnel
   B. Heated cylinder
   C. Conveyor
   D. Festoon

9. Sticky material can be dried in a ________________ dryer ?

   A. Tray
   B. Rotary
   C. Fluidised bed
   D. None of these

10. Refractory bricks are usually dried in a ________________ dryer?

    A. Tray
    B. Tunnel
    C. Conveyor
    D. Festoon