Engineering Questions with Answers - Multiple Choice Questions
Protective Filters
1 - Question
A protective filter can also be called as __________
a) Reverse filter and Inverted filter
b) Horizontal filter
c) None of the mentioned
d) All of the mentioned
View Answer
Answer: a
Explanation: In protective filter, each subsequent layer becomes increasingly coarser than the previous one, and hence, it is also called a reverse filter or inverted filter.
2 - Question
The soil to be protected by protective filter is known as __________
a) Pervious materials
b) Protective materials
c) Base material
d) Porous materials
View Answer
Answer: c
Explanation: The soil to be protected i.e., the embankment or foundation material surrounding the filter is known as the base materials.
3 - Question
The requirements to be satisfied by a filter material were devised by which of the following organization?
a) U.S.B.R. Earth manual
b) Indian standard classification
c) PRA system
d) M.I.T system
View Answer
Answer: a
Explanation: United States Bureau of Reclamation set four main requirements to be satisfied by a filter material for it to be considered as a protective filter.
4 - Question
A protective filter is designed to provide _____________
a) Soil erosion
b) Quick drainage
c) Water moisture
d) All of the mentioned
View Answer
Answer: b
Explanation: A protective filter designed in such a manner as to provide quick drainage, yet prevent the movement of soil particles.
5 - Question
What type of filter is provided at the bottom of drainage sumps and trenches?
a) Drainage filter
b) Reverse filter
c) Weighting filter
d) Horizontal filter
View Answer
Answer: c
Explanation: Weighting filters at the bottom of drainage sumps and trenches arrest the percolating water at the exit and allow its safe exit without inducing piping.
6 - Question
The phreatic line of an earth dam can be kept within the body of the dam by ___________
a) Proper drainage filter
b) Providing protective filter
c) Increasing soil porosity
d) Increasing surface area
View Answer
Answer: b
Explanation: With a proper drainage filter under slope or rock fill toe, the phreatic line in an earth dam can be kept well within the body of the dam.
7 - Question
According to Terzaghi, the D15 size material must be more than the size of __________
a) D40
b) D85
c) D20
d) D10
View Answer
Answer: b
Explanation: The D15 size of filter material must not be more than 4 to 5 times D85 size of the base materials. This prevents the foundation materials from passing through the pores of the filter material.
8 - Question
The grain size curve of the filter should be parallel to that of ____________
a) Base materials
b) Filter
c) Seepage discharge
d) All of the mentioned
View Answer
Answer: a
Explanation: As per the criteria given by Terzaghi, the grain size curve of the material should be roughly parallel to that of the base materials.
9 - Question
The filter material should be ___________ enough to prevent buildup of seepage forces within the filter.
a) Coarse and Pervious
b) Finer
c) None of the mentioned
d) All of the mentioned
View Answer
Answer: a
Explanation: The filter material should be sufficiently coarse and pervious so that the incoming force is rapidly removed without any appreciable buildup of seepage forces within the filter.
10 - Question
A protective filter consists of layers of _____________
a) Base material
b) Pervious material
c) Filter material
d) Sheet-pile
View Answer
Answer: b
Explanation: A protective filter consists of a combination of layers of pervious materials to provide quick drainage.