Unit Operations and Process Equipment MCQs 2026

Membrane ultrafiltration separates by

1. Aonly boiling point difference✓
2. Bmolecular size through porous membrane✓
3. Conly magnetic susceptibility✓
4. Donly photon energy✓

Agitator power number depends on

1. Aimpeller geometry and Reynolds number in vessel✓
2. Bonly pipe length✓
3. Conly stack height✓
4. Donly moon phase✓

Spray dryer produces powder by

1. Aevaporating droplets in hot gas✓
2. Bcompressing gas isothermally✓
3. Cfreezing only without mass transfer✓
4. Dgravity settling only✓

Sedimentation clarifier separates by

1. Amagnetic field only✓
2. Bgravity settling of particles✓
3. Cchemical reaction only✓
4. Dadsorption in zeolite only✓

Tray dryer removes moisture by

1. Aelectrolysis✓
2. Bdistillation reflux only internal✓
3. Ccentrifugal separation only✓
4. Dhot air passing over solid material on trays✓

Crystallization yield improves by

1. Aincreasing impurities always✓
2. Bcontrolled cooling or evaporation to supersaturation✓
3. Crandom agitation only without supersaturation✓
4. Deliminating nucleation always✓

Fluidized bed condition occurs when

1. Aparticles are glued✓
2. Bonly vacuum✓
3. Conly laminar pipe flow✓
4. Dgas velocity supports particle weight with drag✓

Cyclone separator removes particles primarily by

1. Adiffusion only✓
2. Bcentrifugal force in swirling flow✓
3. Cosmosis✓
4. Delectroplating✓

Filtration rate often decreases with time in constant-pressure filtration because

1. Aviscosity becomes zero✓
2. Bfilter area doubles✓
3. Ccake resistance increases✓
4. Dpressure rises✓

Ball mill is used for

1. Adistillation✓
2. Bion exchange✓
3. Csize reduction by impact and attrition✓
4. Delectrorefining only✓