CONSTRUCTION FNC Flashcards
1
Q
- Find the swell of a soil that weighs 1661 kg/m in its natural state and 1186 kg/m after excavation.
A. 40% B. 20%
C. 25% D. 80%
A
40%
2
Q
- Find the shrinkage of a soil that weighs 1661 kg/m3 in its
natural state and 2077 kg/m3 after compaction.
A. 10% B. 20%
C. 25% D. 40%
A
20%
3
Q
- A soil weighs 1163 kg/LCM, 1661 kg/BCM, and 2077
kg/CCM. Find the load factor for the soil.
A. 0.40 B. 0.70
C. 0.80 D. 0.35
A
20%0.70
4
Q
- A soil weighs 1163 kg/LCM, 1661 kg/BCM, and 2077
kg/CCM. Find the shrinkage factor for the soil.
A. 0.40 B. 0.70
C. 0.80 D. 0.35
A
0.80
5
Q
- A soil weighs 1163 kg/LCM, 1661 kg/BCM, and 2077
kg/CCM. How many bank cubic meters (BCM) and
compacted cubic meters (CCM) are contained in 593,300
LCM of this soil?
A. 514 130 BCM & 322 384 CCM
B. 451 130 BCM & 332 824 CCM
C. 415 310 BCM & 332 248 CCM
D. 415 130 BCM & 323 284 CCM
A
415 310 BCM & 332 248 CCM
6
Q
- Find the base width and height of a triangular spoil bank
containing 76.5 BCM if the pile length is 9.14 m, the soil’s
angle of repose is 37°, and its swell is 25%.
A. 7.45 m & 2.80 m B. 7.54m & 2.08 m
C. 5.47 m & 2.08 m D 7 5 4 m &2.80 m
A
7.45 m & 2.80 m
7
Q
- Find the height of a conical spoil pile that will contain 76.5
BCM of excavation if the soil’s angle of repose is 32° and its
swell is 12%.
A. 1.37 m
C. 3.17 m
B. 3.71 m
D. 1.73 m
A
3.17
8
Q
- Estimate the actual bucket load in bank cubic yards for a
loader bucket whose heaped capacity is 3.82 m3. The soil’s
bucket fill factor is 0.90 and its load factor is 0.80.
A. 7.52 BCM B. 2.57 BCM
C. 7.25 BCM
D. 2.75 BCM
A
2.75
9
Q
- Find the expected production in LCM per hour of a small hydraulic excavator. Heaped bucket capacity is 0.57 m3. The material is sand and gravel with a bucket fill factor of 0.95
Job efficiency is 50 min/h. Average depth of cut is 4.3 m.
Maximum depth of cut is 6.1 m and average swing is 90.
Hint: Cycle Output = 250 cycles/60 min
Swing Depth-Factor = 1.00 A. 113 B. 131 C. 111 D. 133
A
113
10
Q
- Find the expected production in LCM per hour of a 2.3
m3 hydraulic shovel equipped with a front-dump bucket. The
material is common earth with a bucket fill factor of 1.0. The
average angle of swing is 75° and job efficiency is 0.80.
Hint: Standard Cycles = 150 cycles/60 min
Swing Depth-Factor = 1.05
A. 270
C. 255
B. 305
D. 290
A
290
11
Q
- Determine the expected dragline production in LCM per
hour based on the following information:
Hint: Job efficiency = 50 min/h
Material = common earth
Average depth of cut = 2.4 m
Swing angle = 120°
Dragline size = 1.53 m3
Soil swell op = 25%
A. 156
C. 231
B. 165
D. 321
A
165
12
Q
- Estimate the production in loose cubic yards per hour for
a medium-weight clamshell excavating loose earth. Heaped
bucket capacity is 0.75 m3. The soil is common earth with a
bucket fill factor of 0.95. Estimated cycle time is 40 s. Job
efficiency is estimated at 50 min/h
A. 35 B. 45
C. 53 D. 63
A
53
13
Q
- A wheel tractor-scraper weighing 91 t is being operated
on a haul road with a tire penetration of 5 cm. What is the
total resistance (kg) and effective grade the scraper is
ascending a slope of 5%?
A. 9100 kg & 10%
B. 9100 kg & 5%
C. 0 kg & 10%
D. 0 kg & 5%
A
9100 kg 10%
14
Q
- A wheel tractor-scraper weighing 91 t is being operated
on a haul road with a tire penetration of 5 cm. What is the
total resistance (kg) and effective grade the scraper is
descending a slope of 5%?
A. 9100 kg & 10%
B. 9100 kg & 5%
C. 0 kg & 10% D. 0 kg & 0%
A
15
Q
- A crawler tractor weighing 36 t is towing a rubber-tired
scraper weighing 45.5 t up a grade of 4%. What is the total
resistance (kg) of the combination if the rolling resistance
factor is 50 kg/t?
A. 5535
C. 5335
B. 5553
D. 3355
A
5535
16
Q
- A four-wheel-drive tractor weighs 20,000 kg and
produces a maximum rimpull of 18,160 kg at sea level. The
tractor is being operated at an altitude of 3050 m on wet
earth. A pull of 10,000 kg is required to move the tractor and
its load. Determine the maximum available power and
maximum usable pull
A. 14346 kg & 9000 kg
C. 14346 kg & 8000 kg
B. 13446 kg & 9000 kg
D. 13446 kg & 8000 kg
A
14346 kg & 9000 kg
17
Q
- A power-shift crawler tractor has a rated blade capacity
of 7.65 LCM. The dozer is excavating loose common earth
and pushing it a distance of 61 m. Maximum reverse speed
in third range is 8 km/h. Estimate the production of the dozer
ifjob efficiency is 50 min/h.
Hint: Fixed time = 0.05 min
Dozing speed = 4.0 km/h
A. 271 LCM/h B. 290 LCM/h
C. 267 LCM/h D. 217 LCM/h
A
14346 kg & 9000 kg271 LCM/h
18
Q
- Estimate the hourly production in loose volume (LCM) of
a 2.68 m3 wheel loader excavating sand and gravel (average
material) from a pit and moving it to a stockpile. The average
haul distance is 61 m, the effective grade is 6%, the bucket
fill factor is 1.00, and job efficiency is 50 min/h
A. 209 LCM/h B. 168 LCM/h
C. 124 LCM/h D. 188 LCM/h
A
168 LCM/h
19
Q
- The estimated cycle time for a wheel scraper is 6.5 min.
Calculate the number of pushers required to serve a fleet of
nine scrapers using single pushers. Determine the result for
both backtrack and chain-loading methods.
A. 4&3 B. 3 & 2
C. 3 & 4 D. 2&3
A
3 & 2
20
Q
- Given the following information on a shoveltruck
operation,
Shovel Production at 100% efficiency = 283 BCM/hr
Job efficiency = 0.75
Truck Capacity = 15.3 BCM
Truck Cycle Time, excluding loading = 0.50 hr
Calculate the number of trucks theoretically required and the
production of this combination.
A. 9 B. 10 C. 1 D. 12
A
11
21
Q
- 24.1 km of gravel road require reshaping and leveling.
You estimate that six passes of a motor grader wil be
required. Based on operator skill, machine characteristics,
and job conditions, you estimate two passes at 6.4 km/h, two
passes at 8.0 km/h, and two passes at 9.7 km/h. If job
efficiency is 0.80, how many grader hours will be required for
this job?
A. 23.1 hrs
C. 21.3 hrs B. 13.2 hrs D.32.1 hrs
A
22
Q
- Trial blasting indicates that a rectangular pattern of
drilling using 7.6-om holes spaced on 2.75-m centers and 6.1
m deep will produce a satisfactory rock break with a particular
explosive loading. The effective hole depth resulting from the
blast is 5.5 m. Determine the rock volume produced per
meter of drilling.
A. 8.6 m’/m
C. 3.6 m3/m
B. 6.3 m//m
D. 6.8 m3/m
A
6.8
23
Q
- From the driving data below, determine the safe load
capacity of a 6-in. - square concrete pile 60 ft long. Assume
that the unit weight of the pile is 150 lb/cu ft.
Pile driver energy = 14 000 Ib-ft
Ram weight = 4000 lb
Weight of driving appurtenances = 1000 lb
Average penetration last six blows = 1/5 in./ blow
Hint: W,+ KWp
R = (5+01) W-+w
R = safe load (Ib)
S = average penetration per blow, last six blows (in.)
E = energy of hammer (ft-b)
K = 0.20 coefficient of restitution
W, = weight of hammer ram (Ib)
W= weight of pile, including driving appurtenances (Ib)
A. 56289
B. 52869
C. 58268lb D. 59862 lb
A
59862
24
Q
- Calculate the safe load capacity of a bulb pile based on
the following driving data.
Selected K value = 25
Volume of base and plug = 25 cu ft
of blows to drive last batch = 40
Volume in last batch driven = 5 cu ft
Height of drop = 20 f
Hammer weight = 3 tons
WXHXBX/2/3
Hint: R =
25
A. 144 tons
C. 155 tons
B. 172 tons
D. 164 tons
A
164 tons
25
Q
- Calculate the number of bricks 95x57x203 mm laid in
running bond required for a double wythe wall 2.44 m high by
4.27 m wide having one opening 1.22x1.83 m and one
opening 0.81x1.22 m. Mortar joints are 13 mm. Allow 3% for
brick waste.
A. 918
C. 981
B. 891
D. 819
A
981
26
Q
- Find the maximum safe unsupported height in meters for
a 20-cm heavyweight concrete block wall if the maximum
expected wind velocity is 80 km/h.
A. 2.1 m B. 3.2 m
C. 1.9 m D. 2.3 m
A
1.9 m
27
Q
- Estimate the hourly repair cost for the first year of
operation of a crawler tractor costing $136,000 and having a
5-year life. Assume average operating conditions and 2000
h of operation during the year.
Hint: Lifetime repair cost factor = 0.90
A. $8.04 B. $ 8.40
C. $ 4.80 D. $ 4.08
A
4.08
28
Q
- Calculate the expected hourly owning and operating cost
for the second year of operation of the twin-engine scraper
described below.
Cost delivered = $152,000
Tire cost = $12,000
Estimated life = 5 years
Salvage value = $16,000
Depreciation method = sum-of-the-vears’-digits
Investment (interest) rate = 10%
Tax, insurance, and storage rate = 8%
Operating conditions = average
Rated power = 465 hp
Fuel price = $1.30/gal
Operator’s wages = $32.00/h
A. $ 93.79/h
C. $ 73.99/h
B. $ 79.43/h
D. $ 97.34/h
A
97.34/h
29
Q
- Determine the hourly production of a 0.57 m? capacity
backhoe, excavating a foundation 3 m deep in common
earth.
A. 67 m°/h
C. 113 m ₴ /h
B. 44 m3/h
D. 54 m?/h
A
44
30
Q
- Trucks are loaded by a 1 m capacity tracked loader
machine at the rate of 30 mgh bulked material. The truck
transports the material to a tip 3 km away. Select the size and
number of trucks required.
Select truck size, say,
loader bucket capacity x 5 = 5 m capacity truck. Minutes
Load Time = 60/30 x 5
Cycle time to tip and back (average speed, 20 km/h)
Dumping, turning and accelerating……
31
Truck 1
Truck 2
Truck 3
Truck 4
18
3
10
18
3
10
18
3
10
18 3
1 min waiting
for excavator
A. Four 4m^3 capacity
C. Three 5 m^3 capacity
B. Five 2 m^3 capacity
D. Two 3 m^3 capacity
A
Three 5 m^3 capacity
31
Q
A
Three 5 m^3 capacity
