chemical engineering MCQs – Page 121

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
2401. The specific surface of spherical particles is given by (where D and ? are diameter and density of particle) ?
comments icon0

A. 2/D.?

B. 4/D.?

C. 12/D.?

D. 6/D.?
2402. _____________ is the most suitable for compounding rubber and plastic solids ?
comments icon0

A. Charge can mixer

B. Pug mill

C. Banbury mixer

D. Pan mixer

2403. The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?
comments icon0

A. Bag filter

B. Wet scrubber

C. Cyclone separator

D. Electrostatic precipitator
2404. Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?
comments icon0

A. Flat blade turbine

B. Propeller

C. Helical screw

D. Curved blade turbine

2405. The optimum moisture content in solids to be crushed/ground ranges from _______________ percent?
comments icon0
A. 3 to 4

B. 15 to 20

C. 10 to 15

D. 8 to 10

2406. For which of the following unit operations, Lewis number is of significance ?
comments icon0
A. Humidification

B. Gas absorption

C. Binary distillation

D. Adsorption

2407. Bucket elevators are not suitable for the vertical lifting of __________ materials?
comments icon0

A. Small lumpy (e.g. grains and sand)

B. Fine (e.g. 200 mesh size coal)

C. Sticky (e.g. clay paste)

D. Free flowing

2408. In a grinding operation, the limiting particle size is the size of the _______________ particle in the sample?
comments icon0
A. Neither A. nor B.

B. Largest

C. Either A. or B.

D. Smallest

2409. For transporting pasty material, one will use a/an__________________?
comments icon0
A. Screw conveyor

B. Bucket elevator

C. Belt conveyor

D. Apron conveyor

2410. If a two phase system is in physical equilibrium; then it means that, the_____________________?
comments icon0

A. al to that from vapor phase to liquid phase

B. Temperature of the liquid phase is equal to that of the vapor phase

C. Total pressure throughout the liquid phase is equal to that throughout the vapor phase

D. Escaping tendency of each component from the liquid phase to the vapor phase is exactly

E. All A., B. and C.
2411. Which of the following gives the crushing energy required to create new surface ?
comments icon0

A. Ficks law

B. None of these

C. Taggarts rule

D. Rittingers Law
2412. Pick out the material having minimum Rittingers number?
comments icon0

A. Galena

B. Pyrite

C. Quartz

D. Calcite

2413. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?
comments icon0

A. V/D.S

B. V/6D.S

C. 6.V/D.S

D. D.S/V

2414. Capacity of a rotary dryer depends on its __________________?
comments icon0

A. rpm

B. Inclination with ground surface

C. Both A. and B.

D. Neither A. nor B.

2415. The crushed material received for separation is called feed or_________________?
comments icon0

A. Middling

B. Heading

C. Tailing

D. Concentrate

2416. For a binary mixture with low relative volatility, continuous rectification to get pure products will require_____________________?
comments icon0

A. Low reflux ratio

B. High reflux ratio

C. Small cross-section column

D. Less number of trays

2417. With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature) ?
comments icon0
A. Increases

B. Remains unchanged

C. Decreases linearly

D. Decreases

2418. Chance process is used for the________________?
comments icon0
A. Cleaning of coal

B. Water treatment

C. Concentration of iron ore

D. Concentration of pyrites

2419. Cement clinker is reduced to fine size by a _____________________?
comments icon0

A. Hammer mill

B. Roll crusher

C. Ball mill

D. Tube mill
2420. A _______________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream?
comments icon0
A. Strainer

B. Thickener

C. Clarifier

D. Classifier