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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

If the amount of the steam used in steam distillation is increased, the temperature of distillation__________________?
A Increases
B Decreases
C Remains unchanged
D Depends on relative volatility
Correct Answer: Decreases
An example of elution is______________________?
A Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank
B Separation of sugar from sugar beet by hot water
C Dissolution of tannin out of tree barks by water
D Recovery of vegetable oils from seeds
Correct Answer: Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank
With increase in pressure, the relative volatility for a binary system_________________?
A Increases
B Decreases
C Remains same
D Either A. or B., depends on the system
Correct Answer: Decreases
Pick out the wrong statement?
A The binary diffusivity in liquids is of the order of 10-5 cm2/sec
B Molecular diffusion in solid is much faster than that in liquids
C Particles movement from higher concentration to lower concentration takes place in diffusion
D According to Poiseuille’s law, the permeability decreases with increase in temperature for
Correct Answer: Molecular diffusion in solid is much faster than that in liquids
Pick out the wrong statement pertaining to the cooling towers ?
A In case of induced draft cooling tower, the fan is placed at the top of the tower
B Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and
C A natural draft cooling tower is recommended to be used, when the air humidity is low and air
D Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb
Correct Answer: Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb
Pick out the wrong statement?
A Change in barometric pressure does not affect the relative humidity
B In case of a packed tower, the operating velocity is about half of the flooding velocity,
C ‘Elution’ means the desorption of the adsorbed solute by a solvent
D The equilibrium moisture content of the solid can be reduced by increasing the absolute
Correct Answer: The equilibrium moisture content of the solid can be reduced by increasing the absolute
Pick out the wrong statement ?
A A horizontal line on the humidity chart indicates the temperature changes at constant molal
B When water is cooled from 80 to 70°C by exposure to the air with a wet bulb temperature of
C For unsaturated air-water vapor mixture at atmospheric conditions, the wet bulb temperature
D Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either
Correct Answer: Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either
Pick out the wrong statement?
A The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are the same
B 1 Nm3 of dry air is lighter than 1Nm3 of humid air
C The Lewis number of a mixture is unity, when the thermal diffusivity is equal to the mass
D An Azeotropic mixture of two liquids has boiling point higher than either of them, when it
Correct Answer: 1 Nm3 of dry air is lighter than 1Nm3 of humid air
Pick out the correct statement ?
A Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas
B The ‘Hatta number’ is important in problems involving gas absorption without chemical
C For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both
D Total reflux in case of distillation operation requires infinite number of plates for a binary
Correct Answer: For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both
Pick out the wrong statement ?
A Constant pressure distillation cannot separate an Azeotropic mixture
B Relative volatility of a binary mixture changes appreciably with the minor change in
C The relative volatility of a binary mixture at Azeotropic composition is unity
D Flash distillation is practised on wide spread scale in petroleum refinery
Correct Answer: Relative volatility of a binary mixture changes appreciably with the minor change in
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