DPWH BOOKING-INA EXAM
QUESTIONS WITH CORRECT
ANSWERS
What is the maximum height allowed for individual rocks and boulders placed in the
embankment? - Answer- They must not exceed 1200 mm (48 inches) in height.
What is the purpose of compaction trials before forming embankments? - Answer- To
ensure that all specified requirements regarding compaction can be consistently
achieved.
What is the minimum density requirement for compacted material in embankment
layers? - Answer- A uniform density of not less than 95 mass percent of the maximum
dry density determined by AASHTO T 99 Method C.
What must the Contractor submit to the Engineer regarding compaction? - Answer-
Proposals for the compaction of each type of fill material, including equipment types,
number of passes, and moisture content adjustments.
What is the required action if the specified density and moisture conditions are not
attained? - Answer- The Contractor must perform additional work to meet the specified
conditions.
What is the purpose of scarifying old road surfaces when constructing embankments? -
Answer- To ensure proper compaction and integration with the new embankment
material.
What must be done to the excavated shoulder material? - Answer- It must be removed
without disturbing the adjacent existing base course material.
How should the embankment material be compacted? - Answer- Using compaction
equipment that meets specified requirements and following approved roller patterns.
What is the maximum depth for scarifying old road surfaces when directed by the
Engineer? - Answer- To a depth of at least 150 mm (6 inches).
What is the purpose of using effective spreading equipment on each lift of
embankment? - Answer- To obtain uniform thickness as determined in the trial section
prior to compaction.
,What should be done with water during compaction to achieve required density? -
Answer- Water should be added or removed as necessary, with removal accomplished
through aeration methods.
What is the requirement for leveling and manipulating embankment layers? - Answer-
Continuous leveling and manipulating are required to assure uniform density as
compaction progresses.
What is the role of the Engineer during the compaction process? - Answer- To make
density tests of compacted material and ensure compliance with specified conditions.
What happens if the embankment material is classified as rock? - Answer- It must be
deposited, spread, and leveled with sufficient fine material to fill the interstices for a
dense compact embankment.
What must be done to the embankment before covering a lift with another? - Answer-
Compaction must comply with the requirements specified.
What is the minimum width for compaction trials required by the Engineer? - Answer-
Not less than 10 m wide and 50 m long.
What is the significance of the relationship between compaction equipment and the
number of passes? - Answer- It determines the effectiveness of compaction and
ensures that specified density is achieved.
What is the maximum thickness of layers when using vibratory rollers with high
compactive effort? - Answer- Thicker layers may be placed if density requirements are
attained and approved by the Engineer.
What must be done to the lower part of the fill when constructing across low swampy
ground? - Answer- It may be constructed by dumping successive loads in a uniformly
distributed layer to support hauling equipment.
What is the requirement for the Contractor regarding in-situ density tests? - Answer- At
least one group of three tests must be carried out for each 500 m of each layer of
compacted fill.
What must be maintained during the construction of the roadway? - Answer- The
roadbed must be well drained at all times.
What should be constructed to avoid erosion damage to embankments? - Answer- Side
ditches or gutters.
What care must be taken when depositing embankment near structures? - Answer-
Avoid compacting the area adjacent to the structure to prevent overturning or excessive
pressure.
, When can fill adjacent to the end bent of a bridge be placed higher? - Answer- Only
after the superstructure is in place.
What is required for rounding slopes in road construction? - Answer- The tops and
bottoms of all slopes must be rounded as indicated on the Plans.
What adjustments should be made to slopes to avoid injury to trees? - Answer-
Adjustments should be made to avoid injury to standing trees or marring of weathered
rock.
What should be done to the roadbed after it has been substantially completed? -
Answer- Remove any soft or unstable material and bring low sections to grade with
suitable selected material.
What is the requirement for earth slopes after construction? - Answer- They should be
left with roughened surfaces but be reasonably uniform and conform to the Plans.
What is the slope ratio for cut slopes in rippable material? - Answer- Between 0.75:1
and 2:1.
What is the maximum diameter of rocks allowed in permanent earth berms? - Answer-
No rocks having a diameter greater than 0.25 the height of the berm.
What must be done to ensure compacted berm construction? - Answer- Material must
be moistened or dried and placed as necessary, containing no frozen material or
deleterious materials.
What is the method of measurement for embankment payment? - Answer- The volume
of material compacted in place, accepted by the Engineer.
What is included in the payment for embankment construction? - Answer- The cost of
excavating, hauling, stockpiling, and all other costs incidental to the work.
What does the subgrade preparation consist of? - Answer- Preparation of the subgrade
for the support of overlying structural layers.
What must be completed before starting subgrade preparation? - Answer- All culverts,
cross drains, ducts, ditches, drains, and drainage outlets.
What are the permitted variations for the finished compacted surface of the subgrade? -
Answer- +20 mm and -30 mm from the design level of surface.
What is the permitted surface irregularity measured by a 3-m straight edge? - Answer-
30 mm.
QUESTIONS WITH CORRECT
ANSWERS
What is the maximum height allowed for individual rocks and boulders placed in the
embankment? - Answer- They must not exceed 1200 mm (48 inches) in height.
What is the purpose of compaction trials before forming embankments? - Answer- To
ensure that all specified requirements regarding compaction can be consistently
achieved.
What is the minimum density requirement for compacted material in embankment
layers? - Answer- A uniform density of not less than 95 mass percent of the maximum
dry density determined by AASHTO T 99 Method C.
What must the Contractor submit to the Engineer regarding compaction? - Answer-
Proposals for the compaction of each type of fill material, including equipment types,
number of passes, and moisture content adjustments.
What is the required action if the specified density and moisture conditions are not
attained? - Answer- The Contractor must perform additional work to meet the specified
conditions.
What is the purpose of scarifying old road surfaces when constructing embankments? -
Answer- To ensure proper compaction and integration with the new embankment
material.
What must be done to the excavated shoulder material? - Answer- It must be removed
without disturbing the adjacent existing base course material.
How should the embankment material be compacted? - Answer- Using compaction
equipment that meets specified requirements and following approved roller patterns.
What is the maximum depth for scarifying old road surfaces when directed by the
Engineer? - Answer- To a depth of at least 150 mm (6 inches).
What is the purpose of using effective spreading equipment on each lift of
embankment? - Answer- To obtain uniform thickness as determined in the trial section
prior to compaction.
,What should be done with water during compaction to achieve required density? -
Answer- Water should be added or removed as necessary, with removal accomplished
through aeration methods.
What is the requirement for leveling and manipulating embankment layers? - Answer-
Continuous leveling and manipulating are required to assure uniform density as
compaction progresses.
What is the role of the Engineer during the compaction process? - Answer- To make
density tests of compacted material and ensure compliance with specified conditions.
What happens if the embankment material is classified as rock? - Answer- It must be
deposited, spread, and leveled with sufficient fine material to fill the interstices for a
dense compact embankment.
What must be done to the embankment before covering a lift with another? - Answer-
Compaction must comply with the requirements specified.
What is the minimum width for compaction trials required by the Engineer? - Answer-
Not less than 10 m wide and 50 m long.
What is the significance of the relationship between compaction equipment and the
number of passes? - Answer- It determines the effectiveness of compaction and
ensures that specified density is achieved.
What is the maximum thickness of layers when using vibratory rollers with high
compactive effort? - Answer- Thicker layers may be placed if density requirements are
attained and approved by the Engineer.
What must be done to the lower part of the fill when constructing across low swampy
ground? - Answer- It may be constructed by dumping successive loads in a uniformly
distributed layer to support hauling equipment.
What is the requirement for the Contractor regarding in-situ density tests? - Answer- At
least one group of three tests must be carried out for each 500 m of each layer of
compacted fill.
What must be maintained during the construction of the roadway? - Answer- The
roadbed must be well drained at all times.
What should be constructed to avoid erosion damage to embankments? - Answer- Side
ditches or gutters.
What care must be taken when depositing embankment near structures? - Answer-
Avoid compacting the area adjacent to the structure to prevent overturning or excessive
pressure.
, When can fill adjacent to the end bent of a bridge be placed higher? - Answer- Only
after the superstructure is in place.
What is required for rounding slopes in road construction? - Answer- The tops and
bottoms of all slopes must be rounded as indicated on the Plans.
What adjustments should be made to slopes to avoid injury to trees? - Answer-
Adjustments should be made to avoid injury to standing trees or marring of weathered
rock.
What should be done to the roadbed after it has been substantially completed? -
Answer- Remove any soft or unstable material and bring low sections to grade with
suitable selected material.
What is the requirement for earth slopes after construction? - Answer- They should be
left with roughened surfaces but be reasonably uniform and conform to the Plans.
What is the slope ratio for cut slopes in rippable material? - Answer- Between 0.75:1
and 2:1.
What is the maximum diameter of rocks allowed in permanent earth berms? - Answer-
No rocks having a diameter greater than 0.25 the height of the berm.
What must be done to ensure compacted berm construction? - Answer- Material must
be moistened or dried and placed as necessary, containing no frozen material or
deleterious materials.
What is the method of measurement for embankment payment? - Answer- The volume
of material compacted in place, accepted by the Engineer.
What is included in the payment for embankment construction? - Answer- The cost of
excavating, hauling, stockpiling, and all other costs incidental to the work.
What does the subgrade preparation consist of? - Answer- Preparation of the subgrade
for the support of overlying structural layers.
What must be completed before starting subgrade preparation? - Answer- All culverts,
cross drains, ducts, ditches, drains, and drainage outlets.
What are the permitted variations for the finished compacted surface of the subgrade? -
Answer- +20 mm and -30 mm from the design level of surface.
What is the permitted surface irregularity measured by a 3-m straight edge? - Answer-
30 mm.
