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Chemical Engineering
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Mechanical Operations
Comments
Question
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
Options
A. flight
B. slat or drag
C. ribbon
D. screw
Correct Answer
screw
Mechanical Operations problems
Search Results
1. The main size reduction operation in ultrafine grinders is
Options
A. cutting
B. attrition
C. compression
D. impact
Show Answer
Scratch Pad
Discuss
Correct Answer: attrition
2. Which of the following is a pressure filter?
Options
A. Leaf filter (Moore filter).
B. Plate and flame filter.
C. Rotary drum filter.
D. Sand filter.
Show Answer
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Discuss
Correct Answer: Plate and flame filter.
3. Pick out the wrong statement.
Options
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.
Show Answer
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Discuss
Correct Answer: The equipment used for the removal of traces of solids from a liquid is called a classifier.
4. If dp is the equivalent diameter of a non-spherical particle, V
p
its volume and sp its surface area, then its sphericity is ?
s
is defined by
Options
A. ?
s
= 6 V
p
/d
p
s
p
B. ?
s
= V
p
/d
p
s
p
C. ?
s
= 6 d
p
S
p
/V
p
D. ?
s
= d
p
S
p
/V
p
Show Answer
Scratch Pad
Discuss
Correct Answer: ?
s
= 6 V
p
/d
p
s
p
5. The distribution given by microscopic analysis of powder is
Options
A. number
B. length
C. area
D. volume
Show Answer
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Discuss
Correct Answer: number
6. Equivalent diameter of a particle is the diameter of the sphere having the same
Options
A. ratio of surface to volume as the actual volume.
B. ratio of volume to surface as the particle.
C. volume as the particle.
D. none of these.
Show Answer
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Discuss
Correct Answer: ratio of surface to volume as the actual volume.
7. Filter aid is used to
Options
A. increase the rate of filtration.
B. decrease the pressure drop.
C. increase the porosity of the cake.
D. act as a support base for the septum.
Show Answer
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Discuss
Correct Answer: increase the porosity of the cake.
8. __________ centrifuge is normally used in sugar mills.
Options
A. Tubular bowl
B. Disc-bowl
C. Suspended batch basket
D. Perforated horizontal basket continuous
Show Answer
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Discuss
Correct Answer: Suspended batch basket
9. Which of the following is not an ultrafine grinder (colloid mill)?
Options
A. Micronizers
B. Agitated mills and fluid energy mills
C. Toothed roll crusher
D. Hammer mills with internal classification
Show Answer
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Discuss
Correct Answer: Toothed roll crusher
10. Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
Options
A. resins
B. gums
C. hard rubber
D. waxes
Show Answer
Scratch Pad
Discuss
Correct Answer: hard rubber
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