2018 September - Morning
1. If log2 y = log (1000), the value of y is nearest;
(a) 1.0
(b) 2.0
(c) 4.0
(d) 8.0
Ans: log (1000) = 3
log y = 3
y = 23
y = 8 (d)
2. A regular pentagon is inscribed in a circle having a radius of 5. Area of this pentagon is nearly as;
(a) 59.441
(b) 90.818
(c) 128.2112
(d) 146.616
Ans: log (1000) = 3
log y = 3
y = 23
y = 8 (d)
6. Consider the bolted joint shown in the adjacent figure. The force P is 30 kN and the diameter of the bolt is 10mm. The average value of the shearing stress existing across either of the plane a - a or b - b is _____.
(a) 191 MPa
(b) 382 MPa
(c) 381.97 MPa
(d) 98 MPa
7. The assembly shown in the figure consists of a brass core (diameter d1 = 6 mm) surrounded by a steel shell (inner diameter d2 = 7 mm, outer diameter d3 = 9 mm). A load P compresses the core and shell, which have length L = 85 mm. The moduli of elasticity of the brass and steel are Eb = 100 GPa and Es = 200 GPa, respectively. What load P will compress the assembly by 0.1 mm?
(a) 3325.9 N
(b) 5912.9 N
(c) 7831.6 N
(d) 9238.8 N
8. The maximum bending stress in the beam shown in the following figure is _____. Note Ix = 301.3 x 10-6 m4 .
(a) 11.2 MPa
(b) 12.7 MPa
(c) 22.5 MPa
(d) 25.4 MPa
9. A specimen of Aluminium having a rectangular cross-section 15 mm x 22.7 mm is pulled in tension with 43,500 N force, producing only elastic deformation. Young's modulus of aluminium is 69 GPa. For that case, the resulting strain will be _____.
(a) 1.65 x 10-3
(b) 1.75 x 10-3
(c) 1.85 x 10-3
(d) 1.95 x 10-3
10. Flow table test is one of the workability tests which has recently become widespread in its use, particularly for flowing concrete with _____ admixtures.
(a) super plasticizing
(b) retarding
(c) waterproofing
(d) water reducing
Ans: (a) super plasticizing (Domone, 1998)
11. Sulphate resisting cement is called Type V Portland cement. This cement has a low _____ content so as to avoid Sulphate attacks from outside of the concrete.
(a) C3S
(b) C2S
(c) C3A
(d) C4AF
Ans: (Mason & Lea, 2021)
Chemical composition
tetra-calcium aluminoferrite, 4CaO · Al2O3Fe2O3
tricalcium aluminate, 3CaO · Al2O3
dicalcium silicate, 2CaO · SiO2
tricalcium silicate, 3CaO · SiO2
Abbreviated Notation
4CaO · Al2O3Fe2O3 → C4AF
3CaO · Al2O3 → C3A
2CaO · SiO2 → C2S
3CaO · SiO2 → C3S
Type V (sulfate-resistant cement) chemical composition
3CaO · SiO2 (C3S) → 38 %
2CaO · SiO2 (C2S) → 43 %
3CaO · Al2O3 (C3A ) → 4 %
4CaO · Al2O3Fe2O3 (C4AF) → 9 %
MgO → 1.9 %
SO3 → 1.8 %
ignition loss → 0.9 %
free CaO → 0.9 %
This type of cement has a very low (C3A) composition which creates high sulfate resistance.
(c) C3A ( 3CaO · Al2O3 Tricalcium Aluminate )
12. In ASTM standards, the ratio of the actual Ultimate Tensile Stress to actual Yield Stress should not be less than _____ for reinforcing steel.
(a) 1.1
(b) 1.15
(c) 1.2
(d) 1.25
Ans: (d) 1.25
(ACI 318-19 Code-20.2.2.5)
(ASTM A615)
13. A strip footing, also known as _____ footing is one of the shallow foundation systems which is provided for a row of columns.
(a) spread
(b) combined
(c) continuous
(d) raft
Ans: (c) continuous (Kimmerling, 2002; Tomlinson & Boorman, 2001)
14. Autoclaving or _____ is one of the curing methods for the development of strength of concrete.
(a) Steam Curing
(b) High-Pressure Steam Curing
(c) Wet Curing
(d) Membrane Curing
Ans: (b) High-Pressure Steam Curing
(Gambhir, 2013)
15. If the liquidity index of the soil is in the range of 0 to 1, the soil will be in the state of _____.
(a) semi-plastic solid state
(b) plastic state
(c) liquid state
(d) solid state
Ans: (b) plastic state
(Budhu, 2015; Sivakugan & Das, 2010)
Liquidity Index, LI
L I < 0 Semisolid state
0 < L I < 1 Plastic state
L I > 1 Liquid state
16. In cohesionless soil, particularly in medium to fine sands, the quick condition is likely to occur at hydraulic gradient of about:
(a) 0
(b) 0.5
(c) 1
(d) 1.5
Ans: (c) 1
Robert F Craig (2004)
The quick condition
Critical hydraulic gradient, ic
ic = ( Gs - 1 ) / ( 1 + e )
Critical hydraulic gradient ( ic ) for most soil is ≃ 1.0
17. The vane shear test is useful to determine the in-situ shear strength for _____.
(a) long term stability of an earthen embankment constructed with homogeneous stiff clay soils
(b) rapid construction of an earthen embankment constructed with homogeneous clay sands and gravels
(c) slow rates of construction of an earthen embankment constructed with homogeneous soft clayey and sensitive soils
(d) none of the above
Ans: (c) slow rates of construction of an earthen embankment constructed with homogeneous soft clayey and sensitive soils
ASTM D 2573-94 (This test method covers the field vane test in soft, saturated, cohesive soils)
18. A saturated soil has a void ratio of 0.5 and a specific gravity of solid soils, Gs = 2.54. The moisture content of the soil is most nearly:
(a) 19%
(b) 20%
(c) 21%
(d) 25%
Ans:
(Das, 2013)
S = ω Gs / e _ _ _ 1.39 (Das, 2013)
e = ω Gs / S
for saturated soil, S = 1,
e = ω Gs _ _ _ 1.40 (Das, 2013)
ω = e / Gs
ω = 0.5 / 2.54
= 0.2 = 20%
(b)
19. In the Bernoulli's Energy equation, " total energy head " means
(a) total energy per unit length
(b) total energy per unit weight
(c) total energy per unit time
Ans: (b) total energy per unit weight
(Featherstone & Nalluri, 1995)
20. Rise of the head (pressure head) caused by the pressure of 7 kN/m2 at the center of circular pipe flowing full is _____.
(a) 0.0165 meter of water
(b) 0.8198 meter of water
(c) 0.7135 meter of water
(d) 1.1089 meter of water
Ans:
Specific weight of water, 𝛾w = 9.81 kN/m3
Pressure, P = 𝛾w h
h = P / 𝛾w
= 7 / 9.81
= 0.7136 (c)
21. The total head available for hydraulic power transmission system is 320m. For getting maximum power transmission through the pipe, the fraction head loss in the pipe must be _____.
(a) 175.6 m
(b) 106.67 m
(c) 120.8 m
(d) 170.6 m
22. Absolute velocity of a jet with the diameter of 80 mm is 75 m/s. Mass rate of the flow (mass/sec) of the jet is _____.
(a) 277 kg / s
(b) 300 kg / s
(c) 377 kg / s
(d) 450 kg / s
Ans:
m = ρ A V
= 1000 kg/m3 × π (0.08)2 / 4 m2 × 75 m/s
= 377 kg/s (c)
23. A Building Costing 500,000 kyats has been constructed on a freehold land measuring 100 m2 recently in a big city. Prevailing rate of land in the neighborhood is 1500 kyats/m2. The owner expects 6 percent interest per year return on the cost of building construction and 4 percent interest per year return on the cost of land. Determine the net rent of the property.
(a) 24,000 kyats
(b) 36,000 kyats
(c) 42,000 kyats
(d) 48,000 kyats
Ans:
Building Cost = 500,000 kyats
Land Cost = 150,000 kyats
6% interest of the cost of building = 30,000 kyats
4% interest of the cost of land = 6,000 kyats
Net rent of the property = 36,000 kyats
(b)
24. One construction company want to build a 100,000 sq.ft, 4 storeyed parking garage for $ 5,000,000. The parking garage include one elevator, which cost $ 120,000 and its costs are included in the $ 5,000,000. Using this information, prepare a preliminary cost estimate for 90,000 sq.ft, 4 storeyed garage with 2 elevators. It is estimated that costs have risen 3% during this year.
(a) $ 2,400,000
(b) $ 4,276,560
(c) $ 4,392,000
(d) $ 4,770,960
25. Calculate the cost of transport of 2,400m3 of stone ballast from a distance of 8 km by truck which can carry 3 m3 per trip.
1st km $ 5.5 per m3 / km
2nd and 3rd km $ 5.5 per m3 / km
4th and 5th km $ 5.5 per m3 / km
6th to 8th km $ 5.5 per m3 / km
(a) $ 24,150
(b) $ 26,160
(c) $ 42,000
(d) $ 62,000
Ans:
1 km = 5.5 $ per m3 / km
2,3 km = 1.0 $ per m3 / km
4,5 km = 0.8 $ per m3 / km
6,7,8 km = 0.6 $ per m3 / km
Cost for 1 km = $ 13,200
Cost for 2,3 km = $ 4,800
Cost for 4,5 km = $ 3,840
Cost for 6,7,8 km = $ 4,320
Total Cost = $ 26,160 (b)
26. An old building has been purchased by a person at a cost of $ 30,000 excluding the cost of the land. Calculate the amount of annual sinking fund at 4% interest assuming the future life of the building as 20 years and the scrap value of the building as 10% of the cost of purchase.
(a) $ 2500
(b) $ 1008
(c) $ 907.2
(d) $ 125
