Distillation and Separation Processes MCQs 2026

Murphree tray efficiency relates

1. A actual to theoretical composition change on tray ✓
2. B pump efficiency ✓
3. C turbine isentropic efficiency ✓
4. D filter cake moisture only ✓

q-line (feed line) slope depends on

1. A only condenser pressure ✓
2. B only reboiler type ✓
3. C feed thermal condition q ✓
4. D only pipe diameter ✓

Azeotrope limits separation because

1. A relative volatility becomes zero or one ✓
2. B pressure is zero ✓
3. C trays disappear ✓
4. D liquid and vapor compositions equal at that point ✓

McCabe-Thiele method uses

1. A only pump curves ✓
2. B operating lines and equilibrium curve on x-y diagram ✓
3. C only stress-strain ✓
4. D only Bode plot ✓

Minimum reflux gives

1. A zero stages ✓
2. B maximum distillate always ✓
3. C azeotrope elimination always ✓
4. D infinite stages for specified separation ✓

Underwood equations help find

1. A minimum reflux for multicomponent feeds ✓
2. B pipe friction only ✓
3. C reactor selectivity only ✓
4. D crystallizer yield only ✓

Packed column uses

1. A only rotating disks like centrifuge ✓
2. B structured or random packing for vapor-liquid contact ✓
3. C only screw conveyor ✓
4. D only electrostatic precipitator ✓

Sieve tray allows vapor passage through

1. A only packing rings ✓
2. B perforations with liquid on tray deck ✓
3. C only membrane pores in liquid ✓
4. D only external heat exchanger tubes ✓

Relative volatility α in binary distillation is

1. A reflux ratio ✓
2. B number of trays only ✓
3. C ratio of vapor pressure or K-values of components ✓
4. D feed temperature only ✓

Reflux ratio R is defined as

1. A vapor flow only ✓
2. B liquid returned to column divided by distillate product ✓
3. C feed flow divided by bottoms ✓
4. D reboiler duty only ✓