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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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.

A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?

A 4.4 KPa

B 2.94 KPa

C 3.7 KPa

D None of these

Review Detailed Answer

Correct Answer: 4.4 KPa

Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?

A Flow rate

B Mean velocity

C Both ‘a’ & ‘b’

D Neither ‘a’ nor ‘b’

Review Detailed Answer

Correct Answer: Mean velocity

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?

A d

B 1/d

C ζ

D 1/ζ

Review Detailed Answer

Correct Answer: ζ

Shear stress in a fluid flowing in a round pipe_________________?

A Varies parabolically across the cross-section

B Remains constant over the cross-section

C Is zero at the centre and varies linearly with the radius

D Is zero at the wall and increases linearly to the centre

Review Detailed Answer

Correct Answer: Is zero at the centre and varies linearly with the radius

Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is________________?

A 90

B 60

C 45

D 30

Review Detailed Answer

Correct Answer: 60

For the transfer of solution of thick slurry, the pump used is a _____________ pump?

A Reciprocating

B Gear

C Diaphragm

D Centrifugal

Review Detailed Answer

Correct Answer: Diaphragm

In fluid flow, cavitation is caused, if the____________________?

A Fluid velocity decreases to zero

B Total energy decreases

C Both A. and B.

D Flow pressure approaches its vapor pressure at the prevailing temperature

Review Detailed Answer

Correct Answer: Flow pressure approaches its vapor pressure at the prevailing temperature

Cavitation can be prevented by________________?

A Suitably designing the pump

B Maintaining the suction head sufficiently greater than the vapour pressure

C Maintaining suction head = developed head

D Maintaining suction head lower than the vapour pressure

Review Detailed Answer

Correct Answer: Maintaining the suction head sufficiently greater than the vapour pressure

Sewage sludge is ______________ type of non-Newtonian fluid?

A Dilatant

B Bingham plastic

C Pseudo plastic

D None of these

Review Detailed Answer

Correct Answer: Bingham plastic

At high Reynolds number_________________?

A Inertial forces control and viscous forces are unimportant

B Viscous forces predominate

C Inertial forces are unimportant and viscous forces control

D None of these

Review Detailed Answer

Correct Answer: Inertial forces control and viscous forces are unimportant

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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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All Topics 9594

A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?

Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?

Shear stress in a fluid flowing in a round pipe_________________?

Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is________________?

For the transfer of solution of thick slurry, the pump used is a _____________ pump?

In fluid flow, cavitation is caused, if the____________________?

Cavitation can be prevented by________________?

Sewage sludge is ______________ type of non-Newtonian fluid?

At high Reynolds number_________________?