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Chemical Engineering Objective Questions { Mechanical Operations }



85. Which of the following oxides is not present in hematite iron ore?
A. Titanium oxide
B. Calcium oxide
C. Cobalt oxide
D. Manganese oxide
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86. 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 due to reduction in velocity of the dust laden gas
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87. Tabular bowl centrifuges as compared to disk bowl centrifuges
A. Operate at higher speed
B. Employ bowl of larger diameter
C. Can't be operated under pressure/vacuum
D. Can't be used for separation of fine suspended solids from a liquid
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88. increasing the capacity of a screen __________ the screen effectiveness.
A. Decreases
B. Increases
C. Does not effect
D. None of these
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89. __________ is the most commonly used 'filter aid'.
A. Diatomaceous earth
B. Fuller's earth
C. Vermiculite
D. Semi-plastic clay
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90. Dispersion of a gas through liquid is done by using a
A. Sparger
B. Kneader
C. Masticator
D. None of these
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91. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
A. d
B. $$\sqrt {\text{d}} $$
C. d2
D. $$\frac{1}{{\text{d}}}$$
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