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MCQ
201. 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.
202. Tied column-এর reduction factor কত হবে?
0.85
0.75
0.70
0.80
ব্যাখ্যা: (i) Tied কলাম Reduction factor = 0.70. (ii) Spiral কলাম Reduction factor = 0.75 (iii) মোমেন্ট ক্ষেত্রে ৫= 0.90 (iv) শিয়ার = 0.85
203. বাংলাদেশের প্রচলিত নির্মাণে স্বাভাবিক অবস্থায় Beam-এর bottom-এর Reinforcement-এর Clear cover কত?
3/4"
1.5"
1"
2"
204. আরসিসি বিম বা স্নাব-এর জন্য সর্বোচ্চ স্লাম্প (Slump) কত সেমি গ্রহণযোগ্য?
১০ সেমি
২০ সেমি
১৫ সেমি
২৫ সেমি
ব্যাখ্যা: আরসিসি বিম স্ল্যাবের জন্য সর্বোচ্চ স্ল্যাম্প = 50mm-100mm বিম, স্ল্যাব, দেওয়াল 50mm- 100mm কলাম, রিটেইনিং ওয়াল 75mm -100mm RCC বুনিয়াদ 50mm-100 mm স্ন্যাপ দেওয়া হয়।
205. Factor of safety বলা হয়-
অন্তিম পীড়ন (ultimate stress) এবং কার্যকরী পীড়নের (working stress) অনুপাতকে
কার্যকরী পীড়ন এবং অন্তিম পীড়নের অনুপাতকে
ভাঙানো পীড়ন (breaking stress) এবং অন্তিম পীড়নের অনুপাতকে
অন্তিম পীড়ন এবং ভাঙানো পীড়নের অনুপাতকে
206. Steel generally used in RCC work is-
Mild steel
Stainless steel
High carbon steel
High tension steel
ব্যাখ্যা: Mild steel is a ferrous metal made from iron and carbon. It is a low-priced material with properties that are suitable for most general engineering application. Low carbon mild steel has good magnetic properties due to its high iron content.
207. 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.
208. A Slab may be designed as one way if the ratio of its longer side to shorter side exceeds.
1.5
1.75
2.00
2.25
ব্যাখ্যা: One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. The ratio of longer span to shorter span is equal or greater than 2, consider as one way slab because this slab will bend in one direction.
209. On the basis of intensity of earthquaks, Bangladesh has been divided into generalised seismic zones of
2
3
4
5
210. A flat slab is supported on-
beams
columns
beams and columns
None of these
ব্যাখ্যা: A flat slab is a two-way reinforced concrete slab that usually does not have beams and girders and the loads are transferred directly to the supporting concrete columns.
211. 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.
212. 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
213. A column is considered long if the effective length of column to its least lateral dimension is more than-
10
15
12
20
ব্যাখ্যা: Long column is considered to be long if the ratio of effective length of column to its least lateral dimension is greater than 12 and short column is considered to be short if the ratio of effective length to its least lateral dimension is less than or equal to 12.
214. 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
215. ACI Code অনুসারে Circular Column-এর Minimum diameter কত?
12 inch
10 inch
8 inch
1/4 of column height in inches
216. Minimum number of reinforcing bars required in a circular column is-
4
6
5
8
নোট: (i) Min of 6 bars in circular arrangement enclosed by spiral reinforcement. (ii) Min of 4 bars in rectangular or circular arrangement enclosed by ties reinforcement. (iii) Min of 3 bars in triangular arrangement of ties.
217. 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.
218. Euler-এর formula প্রযোজ্য শুধু-
বেঁটে column-এর জন্য
দুর্বল column-এর জন্য
বেঁটে এবং লম্বা উভয় column-এর জন্য
লম্বা column-এর জন্য
ব্যাখ্যা: Euler Formule জন্য প্রযোজ্য লম্বা কলাম। শর্ট ও লম্বা কলামের জন্য প্রযোজ্য Rankin Formule.
219. 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।
220. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to-
the weight of the body
more than the weight of the body
less than the weight of the body
weight of the fluid displaced by the body