Evaporation Pharmaceutical engineering MCQ with answers
Pharm Engg Chapterwise MCQ: UNIT-I MCQ * Flow of fluids * Size reduction * Size separation UNIT-II MCQ *Heat transfer *Distillation *Evaporation UNIT-III MCQ *Drying * Mixing UNIT-IV MCQ * Filtration * Centrifugation * UNIT-V MCQ Materials of construction * Corrosion
Which of the following conditions is correct for evaporation?
a. Constituents must be thermolabile
b. Liquids must be viscous
c. The solvent must be non-volatile
d. Solvent must be volatile
a. Constituents must be thermolabile
b. Liquids must be viscous
c. The solvent must be non-volatile
d. Solvent must be volatile
Answer: Solvent must be volatile
In the climbing film evaporator, the problem in the evaporation
a. Boiling point of liquid
b. Droplet formation
c. Entrainment of liquid
d. Film formation
a. Boiling point of liquid
b. Droplet formation
c. Entrainment of liquid
d. Film formation
Answer: Entrainment of liquid
Which is the factor that does not influence the rate of evaporation
a. Difference in vapour pressure
b. Melting points of solids
c. The surface area of the evaporator
d. The viscosity of the solution
a. Difference in vapour pressure
b. Melting points of solids
c. The surface area of the evaporator
d. The viscosity of the solution
Answer: Melting points of solids
Which condition of evaporation is used for the production of malt extract?
a. Atmospheric pressure
b. High-pressure
c. Normal pressure
d. Reduced pressure
a. Atmospheric pressure
b. High-pressure
c. Normal pressure
d. Reduced pressure
Answer: Reduced pressure
Dry extract of belladonna is prepared by exposing the material to one of the following conditions
a. First to a higher temperature and then to a lower temperature
b. First to lower temperature and then to higher temperature
c. Higher temperature
d. Lower temperature
a. First to a higher temperature and then to a lower temperature
b. First to lower temperature and then to higher temperature
c. Higher temperature
d. Lower temperature
Answer: First to lower temperature and then to a higher temperature
Which equipment gives porous residue on evaporation
a. Film evaporator
b. Multiple effect evaporator
c. Open pan evaporator
d. Vacuum evaporator
a. Film evaporator
b. Multiple effect evaporator
c. Open pan evaporator
d. Vacuum evaporator
Answer: Vacuum evaporator
Calandria consists of a number of
a. Baffles
b. Jackets
c. Outlets
d. Tubular surfaces
a. Baffles
b. Jackets
c. Outlets
d. Tubular surfaces
Answer: Tubular surfaces
Which operation is subsequent to evaporation?
a. Crystallization
b. Distillation
c. Drying
d. Extraction
a. Crystallization
b. Distillation
c. Drying
d. Extraction
Answer: Drying
Steam side film coefficients are increased by one of the following methods
a. Condensing liquid at low-temperature
b. Decreasing the velocity of liquid
c. Non-condensed gas in steam should be minimum
d. Temperature drop should be small
a. Condensing liquid at low-temperature
b. Decreasing the velocity of liquid
c. Non-condensed gas in steam should be minimum
d. Temperature drop should be small
Answer: Non-condensed gas in steam should be minimum
The cost per square metre of the heating surface is usually high in one of the evaporators
a. Horizontal tube evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
a. Horizontal tube evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
Answer: Horizontal tube evaporator
Which evaporator is used to concentrate insulin, liver extract and vitamins?
a. Climbing film evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
a. Climbing film evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
Answer: Climbing film evaporator
In the climbing film evaporator, what is the purpose of the entrainment separator
a. Allowing the heat to transfer
b. Allowing the vapour to escape
c. Breaking the foam
d. Pulling the liquid up
a. Allowing the heat to transfer
b. Allowing the vapour to escape
c. Breaking the foam
d. Pulling the liquid up
Answer: Breaking the foam
What is the source of heat in most of the evaporators?
a. Coal
b. Hot water
c. Oil bath
d. Steam
a. Coal
b. Hot water
c. Oil bath
d. Steam
Answer: Steam
In which type of evaporator, the formation of vapour film is assisted by gravity
a. Climbing film evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
a. Climbing film evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
Answer: Falling film evaporator
From the following, select one which forms scales in an evaporator
a. Benzoic acid
b. Calcium sulphate
c. Salicylic acid
d. Sodium chloride
a. Benzoic acid
b. Calcium sulphate
c. Salicylic acid
d. Sodium chloride
Answer: Sodium chloride
Evaporator which helps in growing of coarse crystals
a. Forced circulation evaporator
b. Long tube vertical evaporator
c. Multiple effect evaporator
d. Short tube vertical evaporator
a. Forced circulation evaporator
b. Long tube vertical evaporator
c. Multiple effect evaporator
d. Short tube vertical evaporator
Answer: Forced circulation evaporator
Triple effect evaporator uses one of the following types of evaporators
a. Climbing film evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
a. Climbing film evaporator
b. Falling film evaporator
c. Steam jacketed kettle
d. Vertical tube evaporator
Answer: Vertical tube evaporator
Which of the following is more heat sensitive during evaporation?
a. Alkaloids
b. Glycosides
c. Hormones
d. Volatile oils
a. Alkaloids
b. Glycosides
c. Hormones
d. Volatile oils
Answer: Glycosides
Which type of evaporator is suitable for thermolabile substances and high viscous preparations
a. Forced circulation evaporator
b. Long tube vertical evaporator
c. Multiple effect evaporator
d. Short tube vertical evaporator
a. Forced circulation evaporator
b. Long tube vertical evaporator
c. Multiple effect evaporator
d. Short tube vertical evaporator
Answer: Short tube vertical evaporator
Which one of the following factors increases the efficiency of the evaporator?
a. High moisture content
b. High-velocity flow
c. The high viscosity of liquid
d. A high volume of liquid
a. High moisture content
b. High-velocity flow
c. The high viscosity of liquid
d. A high volume of liquid
Answer: High-velocity flow
Select the preferable evaporator suitable for a corrosive liquid that gives a crystalline product
a. Climbing film evaporator
b. Falling film evaporator
c. Forced circulation evaporator
d. Vertical tube evaporator
a. Climbing film evaporator
b. Falling film evaporator
c. Forced circulation evaporator
d. Vertical tube evaporator
Answer: Forced circulation evaporator
Normally evaporation process is carried out at one of the following experimental conditions
a. Above the boiling temperature
b. At the boiling temperature
c. Below the boiling temperature
d. Room temperature
a. Above the boiling temperature
b. At the boiling temperature
c. Below the boiling temperature
d. Room temperature
Answer: Below the boiling temperature
What is the purpose of a deflector in a forced circulation evaporator?
a. Creates large surface area
b. Facilitates pumping of liquid
c. Promotes separation of liquid and vapour
d. Provides heat to the evaporator
a. Creates large surface area
b. Facilitates pumping of liquid
c. Promotes separation of liquid and vapour
d. Provides heat to the evaporator
Answer: Promotes separation of liquid and vapour
Which of the following is TRUE about the Multiple effect evaporator?
a. It is suitable for batch operation
b. It is highly economical relative to a single effect
c. It cannot attach more than two evaporators
d. It utilizes a horizontal tube evaporator
a. It is suitable for batch operation
b. It is highly economical relative to a single effect
c. It cannot attach more than two evaporators
d. It utilizes a horizontal tube evaporator
Answer: It is highly economical relative to a single effect
The quantity of vapour produced per unit of steam admitted is called
a. efficiency of the evaporator
b. capacity of the evaporator
c. productivity of evaporator
d. economy of the evaporator
a. efficiency of the evaporator
b. capacity of the evaporator
c. productivity of evaporator
d. economy of the evaporator
Answer: economy of the evaporator
The rate of evaporation reduces due to
a. films and deposits
b. high-temperature
c. large surface area
d. a longer time of exposure
a. films and deposits
b. high-temperature
c. large surface area
d. a longer time of exposure
Answer: films and deposits
