TEST 1 (D) Flashcards
Of the following statements relating to new bell and spigot pipe being laid in a trench, the one that is CORRECT is that
A. the enlarged end of the pipe faces downstream
B. bell and spigot pipe is usually elliptical in shape
C. when building a new line using bell and spigot pipe, you start from the downstream end
D. vitrified pipe is usually thicker than concrete pipe of the same diameter
C. when building a new line using bell and spigot pipe, you start from the downstream end
Vitrified pipe is made of
A. clay
B. vermiculite
C. gypsum
D. Portland cement
A. clay
The invert of a sewer pipe is its
A. outer top
B. inner bottom
C. inner top
D. outer bottom
B. inner bottom
A cradle is usually placed under a sewer pipe when the
A. trench is narrow
B. trench is wide
C. soil is poor
D. pipe is near the surface
C. soil is poor
A monolithic sewer is a
A. vitrified pipe sewer
B. sewer carrying only storm water
C. cast-iron sewer containing bell and spigot joints
D. reinforced concrete cast-in-place sewer
D. reinforced concrete cast-in-place sewer
Of the following, the BEST reason for placing manholes on sewers is to
A. provide access for inspection and maintenance
B. allow for overflow during a heavy storm
C. pinpoint the location of the sewer
D. give access to the sewer for the purpose of snow removal
A. provide access for inspection and maintenance
The sheeting in a trench for a sheeted sewer is often left in place after the sewer has been built and backfilled. The BEST reason for ordering the sheeting left in place is that
A. the sheeting is too expensive to remove
B. the removal of the sheeting would disturb the sewer
C. this minimizes the settlement outside the sheeted area
D. the sheeting is too difficult to remove
C. this minimizes the settlement outside the sheeted area
The two MOST frequently used types of sheeting for normal soil conditions and average depths are
A. soldier beams with horizontal sheeting and vertical wood sheeting with bracing
B. steel sheet piling and vertical wood sheeting
C. precast concrete planks with soldier beams and steel sheet piling
D. slurry walls and vertical wood sheeting
A. soldier beams with horizontal sheeting and vertical wood sheeting with bracing
A specification for a new sewer requires that the pavement NOT be restored for a period of at least six months after the backfill is in place.
The BEST reason for this requirement is to
A. be sure that the sewer will work before restoring the pavement
B. minimize the settlement of the pavement
C. defer final payment to the contractor
D. allow the use of a lighter pavement
B. minimize the settlement of the pavement
In reinforced concrete sewers, the reinforcing steel must have a minimum cover of concrete. Of the following, the BEST reason for this requirement is to
A. make the sewer watertight
B. protect the reinforcing steel against corrosion
C. allow the use of smaller sized stone in the concrete
D. eliminate the need for vibrating concrete
B. protect the reinforcing steel against corrosion
As used in relation to sewers, infiltration refers to the
A. leakage of sewage from the sewer to the surrounding soil
B. connection of sanitary sewer lines into storm water sewers
C. inflow of ground water into the sewer
D. loss of mortar at the joints of prefabricated sewers
C. inflow of ground water into the sewer
A BAD effect of infiltration in a sanitary sewer is that it
A. tends to overload the sewage treatment plant
B. corrodes the sewer
C. causes cavitation in the sewer
D. Increases the carrying capacity of the sewer
A. tends to overload the sewage treatment plant
A storm sewer GENERALLY differs from a sanitary sewer in that a storm sewer
A. is generally larger in size than a sanitary sewer and carries little dry-weather flow
B. is generally made of concrete whereas a sanitary sewer is generally made of cast iron
C. generally requires fewer manholes than a sanitary sewer
D. generally has a large slope whereas a sanitary sewer generally has a small slope
A. is generally larger in size than a sanitary sewer and carries little dry-weather flow
Manhole frames and covers are USUALLY made of
A. aluminum
B. malleable iron
C. cast iron
D. steel
C. cast iron
The spacing of rungs used for steps in a manhole is most nearly _____ inches.
A. 4
B. 12
C. 20
D. 26
B. 12
Steel is galvanized by coating it with
A. tin
b. lead
c. copper
d. zinc
d. zinc
ADD 17 TEST 1 (D)
Well points would most likely be used in the construction of a sewer when the
a. sewer is very deep
b. sewer is in rock
c. soil is clayey
d. water table is above the sewer
d. water table is above the sewer
The purpose of jetting the well points in sewer construction is to
A. clean out the screen
B. set the well point in place
c. clean out the area outside the screen
d. remove water from the surrounding area
B. set the well point in place
The type of soil in which well points operate MOST efficiently is
a. sand
b. clay
c. rock
d. silt
a. sand
The water-cement ratio of a concrete mix is USUALLY expressed in terms of
a. Barrels of cement per gallon of water
b. bags of cement per gallon of water
c. gallons of water per bag of cement
d. gallons of water per barrel of cement
c. gallons of water per bag of cement
The effective diameter of a number 4 reinforcing bar is MOST NEARLY ____ inch.
A. 1/4
B. 1/2
C. 3/4
D. 1
B. 1/2
The PRIMARY purpose of curing freshly poured concrete is to
A. Keep the surface smooth
B. prevent honeycombing of the surface
C. improve the appearance of the surface
D. prevent evaporation of water from the surface
D. prevent evaporation of water from the surface
A bag of cement weighs MOST NEARLY_____pounds..
A. 94
B. 104
C. 114
D. 124
A. 94
Of the following, the material that may be used as the coarse aggregate in ordinary Portland cement concrete is
A. well graded sand
B. sand of uniform size
C. crushed rock
D. micaschist
C. crushed rock
In a 1:2:4 concrete mix, the 2 stands for the quantity of
A. water
B. fine aggregate
C. coarse aggregate
D. cement
B. fine aggregate
The height of a slump cone used in concrete testing is _______ inches.
A. 6
B. 8
C. 10
D. 12
D. 12
As commonly used, 3000-pound concrete refers to 3000 pounds per
A. inch
B. square inch
C. cubic inch
D. foot
B. square inch
The factor that has the GREATEST effect on the strength of concrete is the
A. size of coarse aggregate
B. uniformity of the aggregate
C. water-cement ratio
D. quality of the fine aggregate
C. water-cement ratio
The number of bags of cement needed to produce a cubic yard of concrete is called the _________ factor.
A. cement
B. yield
C. bulk
D. output
A. cement
The MAIN purpose of vibrating newly poured concrete when it is in the forms is to
A. remove high points on the surface
B. eliminate air pockets on the surface
C. remove excess water
D. distribute the aggregate evenly in the concrete
B. eliminate air pockets on the surface
A cubic foot of ordinary Portland cement concrete weighs MOST NEARLY _______ pounds.
A. 145
В. 165.
C. 195
D. 220
A. 145
The main purpose of adding an air entraining agent to a concrete mix used for sidewalks it to
A. improve the resistance of the concrete to freezing and thawing conditions
B. decrease the weight of the concrete to lighten the dead load of the concrete
C. increase the compressive strength of the concrete
D. decrease the resistance of the concrete to bleeding
A. improve the resistance of the concrete to freezing and thawing conditions
Of the following operations on a fresh concrete surface, the one that should be performed FIRST is
A. screeding
B. floating
C. trowelling
D. brooming
A. screeding
When concrete is referred to as 3000-pound concrete, the 3000 refers to its strength at the end of ________ days.
A. 7
B. 14
C. 21
D. 28
D. 28
