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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

Pick out the correct statement ?
A Plastic chips are called non-cohesive solids
B Kick’s crushing law is, P/m = K . ln (D̅ sa/D̅ sb)
C Communition is a generic term for size enlargement operation
D Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh
Correct Answer: Kick’s crushing law is, P/m = K . ln (D̅ sa/D̅ sb)
Pick out the wrong statement pertaining to the roll crushers?
A Maximum feed size determines the required roll diameter
B For hard material’s crushing, the reduction ratio should not exceed 4
C Both the rolls run necessarily at the same speed
D Reduction ratio and differential roll speed affect production rate & energy consumed per unit
Correct Answer: Both the rolls run necessarily at the same speed
Pick out the wrong statement?
A Recycled coarse material to the grinder by a classifier is termed as circulating load
B Wear and tear in wet crushing is more than that in dry crushing of materials
C Size enlargement (opposite of size reduction) is not a mechanical operation
D A ‘dust catcher’ is simply an enlargement in a pipeline which permits the solids to settle down
Correct Answer: Size enlargement (opposite of size reduction) is not a mechanical operation
Pick out the wrong statement?
A Close circuit grinding is more economical than open circuit grinding
B Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement ‘industries’
C The equipment used for the removal of traces of solids from a liquid is called a classifier
D Size enlargement is a mechanical operation exemplified by medicinal tablet making
Correct Answer: The equipment used for the removal of traces of solids from a liquid is called a classifier
Pick out the correct statement ?
A Removal of iron from ceramic material is necessitated (by magnetic separation method) so as
B The operating cost of shaking screen is more than that of a vibrating screen
C Screen capacity does not depend upon the specific gravity of the minerals
D Asphalt is best crushed using toothed roll crusher
Correct Answer: Removal of iron from ceramic material is necessitated (by magnetic separation method) so as
Pick out the wrong statement ?
A Hammer crushers operate by impact action
B Standard screens have circular opening
C With increase in mesh number of screens, their diameter in microns decreases
D 200 mesh screen has 200 openings per linear cm
Correct Answer: 200 mesh screen has 200 openings per linear cm
Pick out the correct statement?
A The capacity and the effectiveness of a screen are the same
B The capacity and the effectiveness of screen are opposing factors
C The screening surface of a ‘reel’ (a revolving screen used in flour mills) is made of silk bolting
D Both B. and C.
Correct Answer: Both B. and C.
Ore concentration by jigging is based on the difference in the ______________ of the particles?
A Specific gravities
B Wettability
C Shape
D None of these
Correct Answer: Specific gravities
Use of baffles in agitators help in minimising the ______________ tendency?
A Swirling
B Vortexing
C Both A. & B.
D Neither A. nor B.
Correct Answer: Both A. & B.
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
A Wet grinding in low viscous suspension
B Wet grinding in high viscous suspension
C Dry grinding of large particles (upto 1.25 cms)
D Dry grinding of large particles in un-baffed mills
Correct Answer: Dry grinding of large particles in un-baffed mills
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