Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of uranium
Isotopes of helium
SO₂ and air
N₂ and O₂ from air

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
A 25 cm x 25 cm x 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 x 1m x 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

1000
1500
2000
2500

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
Rotary dryer is suitable for drying sticky material
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%
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.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Mass Transfer