Question: Ion exchange process is similar to___________________?

• 1. Absorption
• 2. Adsorption
• 3. Extraction
• 4. Leaching

Question: Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?

• 1. Schmidt
• 2. Sherwood
• 3. Peclet
• 4. Stanton

Question: If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is___________________?

• 1. L/G
• 2. G/L
• 3. Always < 1
• 4. None of these

Question: For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of _______________ microns (1 mm = 1000 microns)?

• 1. 1-5
• 2. 10-60
• 3. 200-300
• 4. > 500

Question: Berl saddle made of carbon cannot be used for ___________________?

• 1. Alkalis
• 2. SO2
• 3. H2SO4
• 4. Oxidising atmosphere

Question: Capacity of a rotary dryer depends on its __________________?

• 1. rpm
• 2. Inclination with ground surface
• 3. Both A and B
• 4. Neither A nor B

Question: The most common packing used in industrial operations is _______________ rings?

• 1. Raschig
• 2. Lessing
• 3. Cross-partition
• 4. Single spiral

Question: Refractory bricks are usually dried in a ________________ dryer?

• 1. Tray
• 2. Tunnel
• 3. Conveyor
• 4. Festoon

Question: Occurrence of ‘case hardening’ during drying of a high moisture solid cake _______________ the drying rate?

• 1. Increases
• 2. Decreases
• 3. Does not affect
• 4. Exponentially increases

Question: The binary diffusivity in gases at atmospheric conditions is about ___________________?

• 1. 10-9 cm/sec
• 2. 10-1 cm2/sec
• 3. 10-3 sec/cm
• 4. 10-4 cm2/sec2