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Mechanical Operations MCQs

Chemical Engineering Objective Questions

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239. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
A. 4
B. $$\frac{1}{4}$$
C. 1
D. $$\frac{1}{2}$$
Discussion
240. In a roll crusher, both the rolls
A. Have the same diameter
B. Are rotated towards each other
C. Run either at the same or different speeds
D. All of the above
Discussion
241. A gravity decanter is meant for the separation of two __________ density.
A. Immiscible liquids of different
B. Miscible liquids of different
C. Immiscible liquids of same
D. Miscible liquids of same
Discussion
242. Pine oil and cresylic acid are used as __________ in the froth floatation process.
A. Frother
B. Collector
C. Depressor
D. Conditioner
Discussion
243. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
A. 20
B. 12
C. 8
D. 2
Discussion
244. Which of the following must be stored in silos and not in open yard?
A. Coke breeze
B. High V.M. bituminous coal
C. Sand
D. None of these
Discussion
245. In constant pressure filtration,
A. Resistance decreases with time
B. Rate of filtration is constant
C. Rate of filtration increases with time
D. Rate of filtration decreases with time
Discussion

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