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MCQ
181. Hole kept in a retaining wall for seepage of water is-
Brick hole
Weep hole
Steam hole
Black hole
ব্যাখ্যা: Weep hole রিটেইনিং ওয়ালে ড্রিল করা একটি ছিদ্র, যা রিটেইনিং ওয়ালের অভ্যন্তরস্থ পানি নির্গমনে সহায়তা করে।
182. What is the hook length for steel reinforcement of diameter d?
2d
6d
9d
16d
183. A single triangular system is formed in the case of-
single lacing
double lacing
both a and b
none of these
184. 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.
185. 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।
186. The lateral system used in built-up columns, to carry the transverse shear force, is-
lacing
perforated plates
batten plates
any one of these
187. 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.
188. A wall built to resist the pressure of earth filling, is known as-
retaining wall
breast wall
shoring
buttress
189. 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
190. 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.
191. 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
192. 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
193. 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.
194. Slenderness ratio of the lacing bar for compression member should not exceed-
125
145
135
155
ব্যাখ্যা: As per IS 800 Design specification of lacing are: 1. The angle of inclination of the lacing with the longitudinal axis of the column should be between 40° to 70° 2. Slenderness ratio of lacing bar should not exceed 145.
195. The common section used in lacing, is-
rolled steel flat
rolled angle
rolled channel
all of these
196. In frame structure, what transfers the load to columns?
foundation
slabs
beams
roofs
197. 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।
198. The effective length of a battened columns should be increased by-
5%
10%
15%
20%
ব্যাখ্যা: Shear deformation effect নেওয়ার জন্য কলামে বেটেনস ব্যবহার করা হয়। Lacing members-এর তুলনায় Batens ব্যবহারে শিয়ার ডিফরমেশন বৃদ্ধি পায়, তাই 10% হারে কার্যকরী দৈর্ঘ্য বৃদ্ধি করা লাগে।
199. 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
200. 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.