Test 1 (G) Flashcards
In pipe laying, the required width of trench in sand is less than that in clay because
A. of the dilatancy of the sand
B. the sand gives the pipe a more uniform support
C. sand backfill puts less load upon the pipe
D. of backfilling requirements
E. it is easier to enlarge the trench for bell holes in sand
A short post, 12 inches in diameter, is subjected to 75k applied 1” from the center. The maximum stress in the post, in lbs./qs.in., is MOST NEARLY
A. 290
B. 995
C. 1100
D. 1260
E. 1340
Of the following, the geological feature which will have the LEAST effect on a foundation is
A. stratification
B. foliation or cleavage
C. striation
D. dip and strike
E. faults
In tall steel frame buildings, the columns are usually erected in lengths of
A. 16 feet
B. 20 feet
C. one story
D. two stories
E. three stories
The P.C. of a 7 degree curve is a Sa. 16+25.0. The deflection angle to Sta. 17+00 is
A. 4 degrees 29’
B. 3 degrees 18’
C. 2 degrees 38’
D. 1 degree 97’
E. 0 degrees 42’
Reverse curved on highways are customarily separated by tangents. Of the following, the best reason for this separation is
A. to increase sight-distance
B. to increase the radii of the curves
C. to improve the appearance of the highway
D. to avoid sudden changes in curvature
E. concerned with superelevation
The modulus of rupture of a wooden beam is
A. greater than the ultimate strength in tension
B. less than the ultimate strength in tension
C. a function of the shearing strength if the beam is long
D. less than the ultimate strength in compression
E. independent of the cross-section of the beam
Plain sedimentation is usually preferred to chemical precipitation in sewage treatment because
A. disposition of the sludge resulting from chemical precipitation is difficult
B. it removes a greater percentage of total suspended matter
C. it removes a greater percentage of organic matter
D. chemical precipitation always increases the pH concentration
E. the resulting sludge is not putrescible
The strength of clay sewer pipe is NOT usually determined by a(n) ______ test.
A. two-edge bearing
B. three-edge bearing
C. sand bearing
D. knife-edge
E. Izod or impact
The maximum moment that three moving loads of 6, 8, and 10 kips from left to right, respectively, spaced 6 feet apart can cause on a span of 30feet is, in K-ft,
A. 110
B. 120.4
C. 152.6
D. 132.2
E. 95.1
In stream flow, a curve of rate of discharge versus gage height is known as a
A. rating curve
B. mass diagram
C. Rippl digram
D. flood curve
E. calibration curve
An inverted syphon carries a canal from one side of a valley at ELEV. 100 to the other at Elev. 95. Assuming the coefficient of pipe friction is independent of diameter, the required diameter of pipe varies as
A. Q^9/10
B. Q^4/5
C. Q^3/5
D. Q^2/5
E. Q^1/5
Two pipe lines carrying water are at the same elevation. Each is connected to a Bourdon Gage, the center of which is every 4 feet vertically above the pipe center. If one gage registers 10 feet and the other minus 2 feet, the difference in pressure between the two pipes, in pounds per square inch, is about
a. 6.9
b. 6.7
c. 5.9
d. 4.7
e. 3.9
The reason wooden beams bearing on brick walls are cut at the end with a mitre is
a. a precaution in the event of a fire
b. so the inspector can be sure the beam is well seated.
c. to expose fresh surface so that faulty wood may be detected.
d. that beams so cut may be placed more easily
e. to make fire-stopping easier
Of the following conditions, shearing stress in the web of rolled steel beams in MOST likely to influence the choice of section when
a. headroom requires the use of a section shallower than the most economical section
b. the span is long and carries several uniformly spaced concentrated loads
c. the deflection is small
d. the span is long and carries two heavy concentrated loads, one near each support
e. the span is long and uniformly loaded
The gridiron system of water distribution is
A. preferable to the branching system with regard to fire protection
B. only used in the largest cities
C. less advantageous than the branching system because it requires a
superimposed high pressure system being
D. replaced by the branching system
E. Impractical in developments with many curved streets
An advantage of reinforced concrete beam and girder construction, as compared to flat slab construction, is
A. greater fire resistance
B. cheaper form work
C. sprinkler layout is easier
D, ventilation of rooms is easier
E. none of the above
Activated sludge is sludge that
A. is mixed mechanically
B. has been seeded
C. is stirred by air currents which give it a spiral motion
D. is agitated in any one of several ways
E. has been removed from drying bed
In water purification, aeration is used to remove
A. turbidity
B. dissolved oxygen
C. sediment
D. organic material
E. objectionable gases
The maximum unit stress to which a material may be subjected without suffering permanent deformation is known as the
A. elastic limit
B yield strength
C. proportional limit
D. yield point
E. commercial elastic limit
The distance in inches from the back of the short leg to the center of gravity of a 21. 5” x 4” x 1/2” steel angle is APPROXIMATELY
A. 0.80
B. 1.15
C. 1.40
D. 1.55
E. 1.60
A symmetrical triangular roof truss of four panels at 10 feet having a span of 40 feet between end supports and a rise of 10 feet carries a vertical load at the top center of 20,000 pounds. The stress in the upper chord of the end panel, in pounds, is APPROXIMATELY
A. 15,500
B. 19,500
C. 22,500
D. 26,500
E. 28,500
A short concrete column with an effective cross-section 30 inches square has two percent vertical steel reinforcing with proper tie. Assuming fc - 500 pounds per square inch, n = 15, the live load that can safely be carried by this column is MOST NEARLY
A. 550,000 pounds.
B. 575,000
C. 650,000
D. 675,000
E.700,000
A welded cylindrical horizontal steel tank 36 inches in diameter is subjected to an internal 24. pressure caused by 72-toot head of water. The ends of the tank are capped with hemispherical heads extending outward If the allowable tensile strength of the steel be taken as 18,000 lbs. per sq. in., the theoretical thickness of the heads should be, in inches,
A. 0.735
B. 0.015
C. 0.475
D. 0.625
E. 0.375
Water flows from reservoir A, elev. 178, to reservoir B, elev. 106, through 3220 feet of 6” 25. pipe; 1= .02. The velocity in the pipe, in ft./sec., is MOST NEARLY
A. 1
B. 2
C. 3.5
D. 4.5
E. 6
Water is flowing through an open channel of triangular cross-section. The side slopes of channel are 1:1. The water is 8 feet deep. The hydraulic radius is
A. 7.65
B. 6.40
C. 4.37
D. 3.59
E. 2.82
The building code of the large city specified that bearing piles of wood shall not be spaced closer center to center, in inches, than
A. 20
B, 24
C. 28
D. 32
E. 36
- The four sides of a rectangular pier have a uniform batter of 2 inches per foot. If the top of the pier is 4 feet by 10 feet and the pier is 12 feet high, the volume, to the NEAREST cubic foot, is
A. 668
B. 880
C. 992
D. 745
E. 858
To lay out a line 170.00 feet long with a 100-foot tape which is actually 100.03 feet long, the taped distance should be
A. 169.03
B. 169.95
C. 170.45
D. 170.50
E. 170.65
Of the following, the LEAST satisfactory method of preventing electrolysis in underground pipe lines near street railways is
A. applying an insulating coat to the pipe B. using track joint bonds
C. using track joint bonds and cross bonds D. using insulating joints on the pipe
E. providing drains for the road bed
- A uniformly loaded beam is continuous over four uniformly spaced supports, A, B, C, and D, reading from left to right. If the support B settles slightly, the A. reaction at D decreases
B. reaction at C decreases
C. moment at C decreases
D. moment at B increases
E. reaction at A decreases
