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MCQ
4261. The steel used for the manufacture of rails, is-
bessemer steel
cast steel
mild steel
stainless steel
ব্যাখ্যা: Bessemer steel was used in the United States primarily for railroad rails. During the construction of bridge should be used of bessemer steel.
4262. The bending stress in a beam at neutral axis is-
zero
maximum
minimum
none
ব্যাখ্যা: There is no load acting on neutral axis so bending stress on the neutral axis is zero, but shear stress are maximum at neutral axis.
4263. What is the unit weight of brick work?
100 Ib/fr^3
120 Ib/ft^3
140 Ib/ft^3
160 Ib/ft^3
ব্যাখ্যা: The unit weight of brick work is 1920kg/m^3 or 120 lb/fr^3.
4264. In frame structure, what transfers the load to columns?
foundation
slabs
beams
roofs
4265. The transverse reinforcement provided at right angles to the main reinforcement in a slab-
Distributed load
Resist the temperature stress
Resist the shrinkage stress
All of the above
ব্যাখ্যা: The distribution reinforcement have termed as transvers reinforcement is provided that to resist the stresses produced by temperature changes and shrinkage of concrete in that direction.
4266. The minimum number of main steel bars provided in RCC.
rectangular column is 4
circular column is 8
octagonal column is 16
all the above
ব্যাখ্যা: Rectangular = 4-16mmф Circular 6-16mmф
4267. Shell structure does not have any-
bending moment
shear stress
tensile stress
compressive stress
ব্যাখ্যা: Shell structure মূলত RCC নির্মিত পাতলা বাঁকানো প্লেট কাঠামো বিশেষ। এটি দেখতে আঁচ- এর মতো বাঁকানো। এটি কাঠামোর টেনসাইল, শিয়ার পীড়ন এবং চাপ প্রতিরোধ করতে সক্ষম কিন্তু এতে কোনো রকম বেন্ডিং মোমেন্ট উৎপন্ন হয় না।
4268. Why are steel reinforcing rods used in concrete beams-
To make it carry compression
To make it carry tension
To make it carry both compression and tension
None of these
ব্যাখ্যা: Steel reinforcing rods used in concrete beam because they have good tensile strength. concrete carry only compression strength.
4269. The shear reinforcement in RCC is provided to resist-
vertical shear
horizontal shear
diagonal compression
diagonal tension
ব্যাখ্যা: Reinforcement which is designed to resist shear or diagonal tension stresses. Shear reinforcement is usually provided in the form of stirups to hold the longitudinal reinforcement and also to take the shear to which the structure is subjected to
4270. The factor of safety due to sliding of the retaining wall is generally taken as-
1
2
4
1.5
ব্যাখ্যা: স্লাইডিং-এর জন্য Factor of safety 1.5 হতে 2 পর্যন্ত ধরা হয়।
4271. The spacing of stirrups in a rectangular beam is-
kept constant throughout the beam
decrease towards the centre of the beam
increase at the ends
increase at the centre of the beam
ব্যাখ্যা: Maximum spacing of vertical stirrups in a rectangle beam is at its midspan. It's because the shear force at the midspan is very less. The spacing of vertical stirrups is minimum near the supports due to maximum shear force at the supports.
4272. A pretensioned concrete beam, 100 mm wide and 300 mm deep in prestressed by straight wire. Modulus of elasticity of steel and concrete are 210 N/mm² and 35 N/mm² respectively. Find modular ratio.
14
7
6
3
4273. A wall built to resist the pressure of earth filling, is known as-
retaining wall
breast wall
shoring
buttress
4274. The columns whose slendeness ratio is less than 80, are known as-
short columns
long columns
weak columns
medium columns
ব্যাখ্যা: When the columns slendeness ratio is less than 80 is called short column and columns slendeness ratio is greater than 80 is called long column. It is generally fails by buckling.
4275. What is the live load for residential building?
20 lb/ft²
30 lb/ft²
40 Ib/ft²
60 lb/ft²
ব্যাখ্যা: Building codes specify a uniform live loud of 40 pound per square foot for most residential floor designs. This load is intended to account for the large number of load that can occur in a residence.
4276. The live load to be considered for an accessible roof is-
Nil
75 kg/m^3
200 kg/m²
150 kg/m²
ব্যাখ্যা: The permissible live lead of roof is 150 kg/m²
4277. The spacing of transverse reinforcement of column is decided by the following considerations-
The least lateral dimension of the column
Sixteen times the diameter of the smallest longitudinal reniforcing rod is the column
Forty-eight times the diameter of transverse reinforcement
all the above
ব্যাখ্যা: Transverse reinforcement means column stirrups. Spacing ≤16 dia of main bar. Spacing ≤48 dia of fit bar and speacing so lateral dimension of column.
4278. Cast iron is used for:
Structural work in beam
Small size tank
Columns work
Boundary walls
ব্যাখ্যা: Cast iron is used for columns and struts because the column is designed for compression stresses and cast iron is good in compression
4279. Thickness of base, in no case, should be more than-
10 cm
15 cm
20 cm
30 cm
ব্যাখ্যা: Base-এর Thickness 100-300mm-এর বেশি হবে না।
4280. In a single reinforced beam, the effective depth is measured from its compression edge to-
tensile edge
tensile reinforcement
neutral axis of the beam
longitudinal central axis