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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

The mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is _____________________?
A D/a
B D/2a
C Proportional to √D
D Dependent on the Reynolds number
Correct Answer: Dependent on the Reynolds number
The relative volatility of a binary mixture at constant temperature _________________ the total pressure?
A Decreases with increase in
B Increases with increase in
C Is independent of
D None of these
Correct Answer: Decreases with increase in
_______________ equation applies to diffusivities in liquids?
A Gilliland
B Hirschfelder
C Wilke and Chang
D None of these
Correct Answer: Gilliland
When the gas to be dissolved in liquid is a/an ___________________ then normally co-current adsorber are used?
A Mixture of two gases
B Pure gas
C Ideal gas
D Sparingly soluble gas
Correct Answer: Pure gas
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?
A 5.6 × 10-4
B 8.5 × 10-4
C 5.6 × 10-3
D 8.5 × 10-3
Correct Answer: 8.5 × 10-4
H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?
A 2.0
B 1.56
C 1.0
D 0.56
Correct Answer: 2.0
Large scale drying of sugar is done in a _______________ dryer?
A Spouted bed
B Tray
C Rotary
D Truck
Correct Answer: Rotary
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages_______________________?
A Increase
B Decrease
C Remain unchanged
D Can either increase or decrease, depends on the system
Correct Answer: Decrease
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is___________________?
A Insoluble in the liquid
B Soluble in the liquid
C Non-ideal in nature
D At a fixed temperature
Correct Answer: Insoluble in the liquid
During the constant rate period of drying of a solid ?
A Increased air humidity decreases the rate of drying
B Increasing the air temperature decreases the drying rate
C Surface evaporation of unbound moisture occurs
D None of these
Correct Answer: Surface evaporation of unbound moisture occurs
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