civil engineering Mcqs
5151. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?
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A. 1 in 503 upward

B. 1 in 500 upward

C. 1 in 100 upward

D. 1 in 100 downward
5152. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?
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A. 0.50 m/sec

B. 0.75 m/sec

C. 0.70 m/sec

D. 0.60 m/sec

5153. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?
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A. 1 hour

B. 1 hour and 30 minutes

C. 2 hours

D. 30 minutes

5154. The gas which may cause explosion in sewers, is_________________?
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A. Methane

B. Ammonia

C. Carbondioxide

D. Carbon monoxide

5155. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?
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A. Imhoff tanks

B. Sludge sedimentation tanks

C. None of these

D. Trickling filters
5156. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?
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A. 1 in 100

B. 1 in 60

C. None of these

D. 1 in 120

5157. If q is the average sewage flow from a city of population P, the maximum sewage flow______________?
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A. Q = [(18 + P)/(4 + )] q

B. Q = [(18 + )/(4 + )] q

C. Q = [(5 + )/((15 + )] q

D. Q = [(4 + )/(18 + )] q

5158. Pick up the incorrect statement from the following?
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A. Sludge digestion is carried out in sludge tank

B. The gases produced in sludge digestion process, contain 75% carbon dioxide

C. The gases produced in sludge digestion process, contain 75% methane

D. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion

5159. Pick up the correct statement from the following?
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A. Indore method of composting involves decomposition under aerobic conditions

B. Bangalore method of composting involves decomposing under anaerobic conditions

C. all of these

D. Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus

5160. Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?
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A. The men entering the manhole should be advised to smoke in the sewer

B. Proper tests for the presence of poisonous gases must be carried out

C. Warning signals should be erected

D. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes

5161. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?
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A. 40,000 to 50,000 litres/sqm/day

B. 80,000 to 100,000 litres/sqm/day

C. 50,000 to 60,000 litres/sqm/day

D. 25,000 to 35,000 litres/sqm/day

5162. At the junction of sewers___________________?
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A. Top of smaller sewer is kept lower

B. Top of larger sewer is kept lower

C. Tops of both the sewers are at the same level

D. None of these
5163. Pick up the correct statement from the following?
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A. The boning rod is used for checking the levels of the sewer inverts

B. A manhole is classified as shallow manhole if its depth is less than 0.9 m

C. All the above

D. Manhole covers are made circular for the convenience of the cleaning staff

5164. In sewers the velocity of flow should not be_________________?
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A. Less than 10 m/sec

B. More than 20 m/sec

C. Less than the self-cleansing velocity

D. More than the self-cleansing velocity

5165. By providing sufficient edge distance, which of the following failures of riveted joint can be avoided ?
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A. shear failure of the rivet

B. shear failure of the plate

C. tension failure of the plate

D. crushing failure of the rivet

5166. Rivets connecting flange angles to cover plates in a plate girder are subjected to_________________?
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A. horizontal shear only

B. vertical load only

C. both (A. and (B.

D. none of the above

5167. The moment of inertia of the pair of vertical stiffeners about the center line of the web should not be less than__________________?
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A. 1.5d/C2

B. 1.5dV/C

C. 1.5dY/C3

D. 1.5d/C

5168. Maximum pitch of rivets, used in steel stacks, is limited to_______________?
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A. re t is thickness of thinner plate being connected

B. 161

C. 121

D. 101

E. 6t

5169. Which of the following types of riveted joint is free from bending stresses ?
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A. lap joint

B. none of the above

C. butt joint with single cover plate

D. butt joint with double cover plates
5170. The mechanism method of plastic analysis satisfies___________________?
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A. equilibrium condition only

B. equilibrium and mechanism conditions

C. equilibrium and plastic moment conditions

D. mechanism and plastic moment conditions

5171. Normally, the angle of roof truss with asbestos sheets should not be less than_______________?
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A. 40

B. 30

C. 35

D. 26/2

5172. According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as________________?
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A. 0.67 L

B. 0.8 L

C. L

D. 1.5 L

5173. A circular column section is generally not used in actual practice because________________?
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A. it is difficult to connect beams to the round sections

B. all of the above

C. it cannot carry the load safely

D. it is uneconomical

5174. The best arrangement to provide unified behaviour in built up steel columns is by______________?
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A. tie plates

B. lacing

C. perforated cover plates

D. battening

5175. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwins formula will be__________________?
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A. 27 mm

B. 20 mm

C. 24 mm

D. 16 mm

5176. The allowable shear stress in the web of mild steel beams decreases with__________________?
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A. decrease in h/t ratio

B. re h is height and t is thickness

C. increase in h/t ratio

D. increase in height

E. decrease in thickness

5177. Shape factor is a property which depends________________?
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A. only on the ultimate stress of the material

B. only on the yield stress of the material

C. only on the geometry of the section

D. both on the yield stress and ultimate stress of material

5178. The internal pressure coefficient on walls for buildings with large permeability is taken as_______________?
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A. 0.5

B. 0

C. 0.7

D. 0.2

5179. The effective length of a fillet weld should not be less than___________________?
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A. six times the weld size

B. two times the weld size

C. four times the weld size

D. weld size

5180. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as______________?
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A. 120 mm

B. 160 mm

C. 200 mm

D. 300 mm

5181. The use of tie plates in laced columns is_________________?
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A. not prohibited

B. prohibited

C. permitted at start and end of lacing system only

D. permitted between two parts of the lacing

5182. Area of openings for buildings of large permeability is more than_________________?
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A. 20% of wall area

B. 50% of wall area

C. 30% of wall area

D. 10% of wall area

5183. The ratio of plastic section modulus to elastic section modulus__________________?
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A. is always greater than 1

B. is equal to 1

C. is always less than 1

D. can be less than 1

5184. Bearing stiffener in a plate girder is used to__________________?
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A. decrease the effective depth of web

B. prevent excessive deflection

C. prevent buckling of web

D. transfer the load from the top flange to the bottom one

5185. In case of plastic design, the calculated maximum shear capacity of a beam as per IS:800 shall be________________?
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A. 0.65 Awfy

B. 0.85 Awfy

C. 0.75 Awfy

D. re, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel

E. 0.55 Awfy
5186. In moment resistant connections, the moment resistance of riveted connection depends upon________________?
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A. tension in rivets

B. strength of rivets in bearing

C. shear in rivets

D. compression in rivets

5187. Which of the following conditions is to be satisfied both in elastic and plastic analysis ?
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A. equilibrium condition

B. plastic moment condition

C. yield condition

D. mechanism condition

5188. The actual thickness of butt weld as compared to the thickness of plate is usually________________?
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A. more

B. equal

C. none of the above

D. less

5189. Bending compressive and tensile stresses respectively are calculated based on_________________?
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A. net area and gross area

B. gross area and net area

C. net area in both cases

D. gross area in both cases

5190. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is_________________?
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A. 70%

B. 50%

C. 60%

D. 40%

5191. The bracing provided in the plane of end posts is called__________________?
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A. portal bracing

B. top lateral bracing

C. bottom lateral bracing

D. sway bracing

5192. The mechanism method and the statical method give__________________?
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A. upper and lower bounds respectively on the strength of structure

B. lower bound on the strength of structure

C. upper bound on the strength of structure

D. lower and upper bounds respectively on the strength of structure

5193. According to IS Specifications, the maximum pitch of rivets in compression is_____________________?
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A. lesser of 200 mm and 161

B. lesser of 200 mm and 12 t

C. re t is thickness of thinnest outside plate or angle

D. lesser of 300 mm and 32 t

E. lesser of 3 00 mm and 24 t

5194. The maximum slenderness ratio of a compression member carrying both dead and superimposed load is___________________?
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A. 180

B. 250

C. 350

D. 200

5195. The relation between intensity of wind pressure p and velocity of wind V is taken as_______________?
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A. paV2

B. p a (1/V)

C. paV2

D. pa V

5196. In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate__________________?
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A. 75% by direct bearing and 25% through fastenings

B. fully by direct bearing

C. fully through fastenings

D. 50% by direct bearing and 50% through fastenings
5197. When the axis of load lies in the plane of rivet group, then the rivets are subjected to________________?
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A. only shear stresses

B. only tensile stresses

C. both (A) and (B)

D. none of the above

5198. As compared to field rivets, the shop rivets are________________?
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A. any of the above

B. stronger

C. equally strong

D. weaker

5199. The slenderness ratio of lacing bars should not exceed________________?
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A. 100

B. 120

C. 145

D. 180

5200. The allowable tensile stress in structural mild steel plates for steel tank is assumed as________________?
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A. 150.0 MPa on gross area

B. 105.5 MPa on net area

C. 105.5 MPa on gross area

D. 95.0 MPa on net area