Mass Transfer MCQs

Option A: Continuous

Option B: Steam

Option C: Azeotropic

Option D: None of these

Correct Answer: Steam ✔

Option A: Evaporation

Option B: Sublimation

Option C: Dehydration

Option D: Adsorption

Correct Answer: Sublimation ✔

Option A: Litre

Option B: gm

Option C: Kg

Option D: m3

Correct Answer: Kg ✔

Option A: Same as differential distillation

Option B: Used for multi-component systems like crude refining

Option C: Same as simple distillation

Option D: Most useful for handling binary systems

Correct Answer: Used for multi-component systems like crude refining ✔

Option A: The partial pressure of water vapour increases

Option B: The specific humidity decreases

Option C: The relative humidity increases

Option D: The relative humidity decreases

Correct Answer: The relative humidity decreases ✔

Option A: Penetration

Option B: Surface renewal

Option C: Film

Option D: None of these

Correct Answer: Surface renewal ✔

Option A: Decoction

Option B: Dissolution

Option C: Percolation

Option D: Agitation and settling

Correct Answer: Percolation ✔

Option A: Reduce the number of plates

Option B: Avoid thermal decomposition of a component

Option C: Increase the efficiency of separation

Option D: Increase the total pressure of distillation

Correct Answer: Avoid thermal decomposition of a component ✔

Option A: Dew point

Option B: Humidity ratio

Option C: Wet bulb temperature

Option D: None of these

Correct Answer: Wet bulb temperature ✔

Option A: KG = 1/KG + m/KL

Option B: 1/KG = 1/KG + m/KL

Option C: 1/KG = 1/KL + m/KG

Option D: KG = 1/KL + m/KG

Correct Answer: KG = 1/KG + m/KL ✔

Option A: Differential

Option B: Flash

Option C: Equilibrium

Option D: Molecular

Correct Answer: Differential ✔

Option A: 1

Option B: 2

Option C: 3

Option D: 4

Correct Answer: 3 ✔

Option A: Cost

Option B: Availability

Option C: Toxicity

Option D: Selectivity

Correct Answer: Selectivity ✔

Option A: 0.01

Option B: 0.1

Option C: 1

Option D: 10

Correct Answer: 0.1 ✔

Option A: Is computed from the slope of the upper operating line that is tangent to the equilibrium curve

Option B: Is computed from the intercept of the operating line

Option C: Cannot be computed

Option D: Is the optimum reflux ratio

Correct Answer: Is computed from the slope of the upper operating line that is tangent to the equilibrium curve ✔

Option A: K ∝D

Option B: K ∝√D

Option C: K ∝D1.5

Option D: K ∝D2

Correct Answer: K ∝√D ✔

Option A: Packed towers

Option B: Plate towers

Option C: Spray towers

Option D: Wetted wall columns

Correct Answer: Wetted wall columns ✔

Option A: Only vapor phase follows Raoult’s law

Option B: Only liquid phase obeys Dalton’s law

Option C: Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law

Option D: Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law

Correct Answer: D. Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law ✔

Option A: Surface renewal

Option B: Film

Option C: Penetration

Option D: None of these

Correct Answer: Film ✔

Option A: Increased diffusivity

Option B: Decreased viscosity of liquid

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: 1

Option B: 0

Option C: 2

Option D: 3

Correct Answer: 1 ✔

Option A: Unbound

Option B: Critical

Option C: Free

Option D: Bound

Correct Answer: Unbound ✔

Option A: Differential heat of adsorption

Option B: Heat of wetting

Option C: Integral heat of adsorption

Option D: None of these

Correct Answer: Differential heat of adsorption ✔

Option A: Continuous

Option B: Batch

Option C: Semi-batch

Option D: Cooling (adiabatic)-cum-evaporation

Correct Answer: Continuous ✔

Option A: 1000

Option B: 1500

Option C: 2000

Option D: 2500

Correct Answer: 1000 ✔

Option A: Partial pressure of a component over a solution is proportional to its mole fraction in the

Option B: Partial pressure of a component over a solution is proportional to the mole fraction in the

Option C: Vapour pressure is equal to the product of the mole fraction and total pressure

Option D: Partial pressure is equal to the product of the mole fraction and total pressure

Correct Answer: A. Partial pressure of a component over a solution is proportional to its mole fraction in the
liquid ✔

Option A: Bollman extractor

Option B: Rotating disc extractor

Option C: Packed extraction column

Option D: Plate type extraction column

Correct Answer: Rotating disc extractor ✔

Option A: Less

Option B: More

Option C: Equal

Option D: Either A. or B.; depends on the packing height

Correct Answer: More ✔

Option A: Better flow characteristics

Option B: Low pumping pressure drop

Option C: Rapid absorption rates

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Wet bulb temperature

Option B: Relative humidity

Option C: Partial pressure of vapour

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Only heat

Option B: Only mass

Option C: Both heat and mass

Option D: None of these

Correct Answer: Both heat and mass ✔

Option A: Interface

Option B: Gas phase

Option C: Liquid phase

Option D: All A , B. & C.

Correct Answer: Interface ✔

Option A: Agitated film evaporator

Option B: Long tube vertical evaporator

Option C: Short tube evaporator

Option D: Calandria

Correct Answer: Agitated film evaporator ✔

Option A: Half

Option B: Twice

Option C: Equal to

Option D: More than

Correct Answer: Half ✔

Option A: Lies above the equilibrium curve

Option B: Lies below the equilibrium curve

Option C: Can lie above or below the equilibrium curve

Option D: Is always parallel to the equilibrium curve

Correct Answer: Can lie above or below the equilibrium curve ✔

Option A: S > 1

Option B: S < 1

Option C: S = 1

Option D: S = ∞

Correct Answer: S > 1 ✔

Option A: 100

Option B: 10

Option C: 5

Option D: 1

Correct Answer: 10 ✔

Option A: Soap manufacturing

Option B: Ammonia synthesis plant

Option C: Polymerisation industry

Option D: Petroleum refining

Correct Answer: Petroleum refining ✔

Option A: Decreases

Option B: Increases

Option C: Remains unchanged

Option D: May increase or decrease, depends on the system

Correct Answer: Increases ✔

Option A: Relative humidity decreases

Option B: Relative humidity increases

Option C: Wet bulb temperature decreases

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: NSc = 1

Option B: NSc = NPr = NLe

Option C: NPr = NLe

Option D: NSc = NLe

Correct Answer: NSc = NPr = NLe ✔

Option A: Absorption factor is constant, when the equilibrium and operating lines are straight

Option B: In case of a stripper, the equilibrium curve is always below the operating line

Option C: In case of an absorber, the operating line is always above the equilibrium curve

Option D: In the absorption of low solubility gases, the liquid film is the controlling resistance

Correct Answer: In case of a stripper, the equilibrium curve is always below the operating line ✔

Option A: In the corners

Option B: Inside

Option C: On the sides

Option D: None of these

Correct Answer: Inside ✔

Option A: Sparingly soluble

Option B: Highly soluble

Option C: A pure substance

Option D: A mixture

Correct Answer: A pure substance ✔

Option A: As the acetone concentration increases, the solubility curves approach each other

Option B: Both the phases become identical at a particular common point on both the solubility curves

Option C: The distribution curve which is a plot between x (acetone concentration in one phase) and y

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: < 150

Option B: 200-330

Option C: > 500

Option D: > 1000

Correct Answer: 200-330 ✔

Option A: Higher molecular weight is adsorbed in preference to a gas of low molecular weight

Option B: High critical temperature is adsorbed in preference to a gas of low critical temperature

Option C: Low volatility is adsorbed in preference to a gas of high volatility

Option D: None of these

Correct Answer: None of these ✔

Option A: Humidification only

Option B: Heating only

Option C: Both heating and humidification

Option D: Evaporative cooling

Correct Answer: Both heating and humidification ✔

Option A: Flow rate of the entering gas

Option B: Composition of the entering liquid

Option C: Terminal concentrations of gas stream

Option D: None of these

Correct Answer: None of these ✔

Option A: Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

Option B: Vapour is recycled to the column

Option C: Reboiler itself contains one plate

Option D: None of these

Correct Answer: Of the assumption that vapour and liquid leaving the reboiler are in equilibrium ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: Increases linearly

Correct Answer: Increases ✔

Option A: Fluidised bed

Option B: Spouted bed

Option C: Tray

Option D: Vacuum rotary

Correct Answer: Spouted bed ✔

Option A: Decreased liquid viscosity

Option B: Increased diffusivity

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: q > 1

Option B: q < 1

Option C: q = 1

Option D: q = 0

Correct Answer: q = 1 ✔

Option A: Lower than

Option B: Higher than

Option C: Same as

Option D: Either same or higher than

Correct Answer: Lower than ✔

Option A: Greater than

Option B: Smaller than

Option C: Equal to

Option D: Either A., or B.; depends on the type of packing

Correct Answer: Smaller than ✔

Option A: Lewis

Option B: Grashoff

Option C: Sherwood

Option D: None of these

Correct Answer: Lewis ✔

Option A: Cooled

Option B: Humidified

Option C: Both A. & B.

Option D: Dehumidified

Correct Answer: Humidified ✔

Option A: Flux = Co-efficient/concentration difference

Option B: Co-efficient = Flux/concentration difference

Option C: Flux=concentration difference/coefficient

Option D: None of these

Correct Answer: Co-efficient = Flux/concentration difference ✔

Option A: Freeze

Option B: Through circulation

Option C: Rotary vacuum

Option D: Tray

Correct Answer: Through circulation ✔

Option A: 0.5 to 0.8

Option B: 0.8 to 1.2

Option C: 1.25 to 2.0

Option D: 2.5 to 3.5

Correct Answer: 1.25 to 2.0 ✔

Option A: 6.89

Option B: 8.89

Option C: 10

Option D: 8.25

Correct Answer: 8.89 ✔

Option A: Rotary

Option B: Tray

Option C: Freeze

Option D: None of these

Correct Answer: Tray ✔

Option A: Temperature is 100°C

Option B: Temperature is more than 100° C

Option C: Product must be immiscible with water

Option D: Temperature is higher than the boiling point of either component

Correct Answer: Product must be immiscible with water ✔

Option A: Spray dryer

Option B: Drum dryer

Option C: Rotary dryer

Option D: Dielectric dryer

Correct Answer: Spray dryer ✔

Option A: Dry bulb temperature

Option B: Partial pressure of vapour

Option C: Wet bulb temperature

Option D: None of these

Correct Answer: Dry bulb temperature ✔

Option A: Cold water

Option B: Hot water

Option C: Dilute hot caustic solution

Option D: Naphtha

Correct Answer: Hot water ✔

Option A: Steady state equimolar counter diffusion

Option B: Fick’s first law of diffusion

Option C: Steady state diffusion for stagnant case

Option D: Liquid M.T.C. by penetration theory

Correct Answer: Steady state equimolar counter diffusion ✔

Option A: (De.t)1/2

Option B: (De/t)1/2

Option C: (4De/πt)1/2

Option D: (4De/t)

Correct Answer: (4De/πt)1/2 ✔

Option A: 1

Option B: > 1

Option C: 0

Option D: ∞

Correct Answer: 1 ✔

Option A: Gas side co-efficient should be increased

Option B: Liquid side coefficient should be increased

Option C: Gas side co-efficient should be decreased

Option D: Liquid side co-efficient should be decreased

Correct Answer: Liquid side coefficient should be increased ✔

Option A: Free

Option B: Unbound

Option C: Equilibrium

Option D: Bound

Correct Answer: Equilibrium ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: Either A. or B.; depends on the gas

Correct Answer: Increases ✔

Option A: Decreases

Option B: Remains unchanged

Option C: Increases

Option D: Decreases exponentially

Correct Answer: Increases ✔

Option A: 10-15

Option B: 30-40

Option C: 70-80

Option D: 90-100

Correct Answer: 10-15 ✔

Option A: √T

Option B: T2

Option C: T

Option D: T4

Correct Answer: √T ✔

Option A: Recovery of valuable solvent vapors from dilute mixture with air and other gases

Option B: Dehumidification of air and gas

Option C: Removal of objectionable odour and impurities from industrial gases

Option D: Decolouration of yellow glycerine

Correct Answer: Decolouration of yellow glycerine ✔

Option A: Increasing the air velocity and area of exposed wet surface

Option B: Reducing the barometric pressure

Option C: Reducing the humidity of the air

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Perfectly dry

Option B: Highly humid

Option C: High temperature

Option D: None of these

Correct Answer: Perfectly dry ✔

Option A: 5

Option B: 0.5

Option C: 0.05

Option D: 50

Correct Answer: 5 ✔

Option A: G/(FG . a)

Option B: FG/(G . a)

Option C: (G . a)/FG

Option D: L/(FG . G)

Correct Answer: G/(FG . a) ✔

Option A: Higher contact area

Option B: Better contact of the phase

Option C: Repeated coalescence & redispersion of the drop phase

Option D: None of these

Correct Answer: Repeated coalescence & redispersion of the drop phase ✔

Option A: Fick’s second law of diffusion

Option B: Steady state diffusion for stagnant case

Option C: Liquid M.T.C. by Higbie penetration theory

Option D: None of these

Correct Answer: Steady state diffusion for stagnant case ✔

Option A: Increase

Option B: Decrease

Option C: Remain unaffected

Option D: Decrease or increase; depends on the type of liquid

Correct Answer: Increase ✔

Option A: Methyl ethyl ketone

Option B: Water

Option C: Carbon tetrachloride

Option D: Carbon dioxide

Correct Answer: Carbon dioxide ✔

Option A: log P vs. T

Option B: log P vs. log T

Option C: T vs. P

Option D: P vs. log T

Correct Answer: log P vs. T ✔

Option A: D/a

Option B: D/2a

Option C: Proportional to √D

Option D: Dependent on the Reynolds number

Correct Answer: Dependent on the Reynolds number ✔

Option A: Decreases with increase in

Option B: Increases with increase in

Option C: Is independent of

Option D: None of these

Correct Answer: Decreases with increase in ✔

Option A: Gilliland

Option B: Hirschfelder

Option C: Wilke and Chang

Option D: None of these

Correct Answer: Gilliland ✔

Option A: Mixture of two gases

Option B: Pure gas

Option C: Ideal gas

Option D: Sparingly soluble gas

Correct Answer: Pure gas ✔

Option A: 5.6 × 10-4

Option B: 8.5 × 10-4

Option C: 5.6 × 10-3

Option D: 8.5 × 10-3

Correct Answer: 8.5 × 10-4 ✔

Option A: 2.0

Option B: 1.56

Option C: 1.0

Option D: 0.56

Correct Answer: 2.0 ✔

Option A: Spouted bed

Option B: Tray

Option C: Rotary

Option D: Truck

Correct Answer: Rotary ✔

Option A: Increase

Option B: Decrease

Option C: Remain unchanged

Option D: Can either increase or decrease, depends on the system

Correct Answer: Decrease ✔

Option A: Insoluble in the liquid

Option B: Soluble in the liquid

Option C: Non-ideal in nature

Option D: At a fixed temperature

Correct Answer: Insoluble in the liquid ✔

Option A: Increased air humidity decreases the rate of drying

Option B: Increasing the air temperature decreases the drying rate

Option C: Surface evaporation of unbound moisture occurs

Option D: None of these

Correct Answer: Surface evaporation of unbound moisture occurs ✔

Option A: 5

Option B: 9

Option C: 12

Option D: 28

Correct Answer: ✔