questions for ies master reso€¦ · 4.(c) a suspension cable of 160 m span and 16 m central dip...

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Questions from Resources

in Mains Exam UPSC ESE 2019 IES Master

CIVIL ENGINEERING Paper-I

IES M

ASTER

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CIVIL ENGINEERING - Paper IMains Exam

Questions from IES Master resources


CIVIL ENGINEERING - Paper IQuestions from IES Master resources

1.(a) (i) Explain briefly the various tests conducted on Bricks mentioning the relevant codalprovisions.

[8 Marks]

Source 1: IES Master Conventional Question Practice Book Page No.278 Question No. 36

Source-2: IES Master Booklet Bulding Material From Page No. 196 To198

1(a) (ii) Explain the products of hydration of C3S and C2S (Bogues compounds) giving therelevant equations involving the reactions.

[4 Marks]





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Source: IES Master Booklet Bulding Material From Page No. 4 To 5

1.(b) (i) Explain the following defects in timber with neat sketches :(A) Shakes (B) Knots

[4 Marks]

Source: IES Master Booklet Bulding Material From Page No. 165 To 167

1(b) (ii) A compound tube consists of a steel tube 150 mm internal diameter and 170 mmexternal diameter and a brass tube of 170 mm internal diameter and 190 mm externaldiameter. The two tubes are of the same length. The compound tube carries an axialload of 1000 kN. Find the stresses and the load carried by each tube and the amountit shortens. Length of each tube is 140 mm. Take E for steel as 2×105 N/mm12 and forbrass as 1×105 N/mm2.

[8 Marks]

IES M

ASTER







Source: CQPP 2019 Test-8 Q. 4(a)

1(c) (ii) Direct stresses of 120 MN/m2 in tension and 90 MN/m2 in compression are applied toan elastic material at a certain point on planes at right angles to each other. If themaximum principal stress is not to exceed 150 MN/m2 in tension, to what shearingstress can the material be subjected ? What is then the maximum resulting shearingstress in the material ? Also find the magnitude of the other principal stress and itsinclination to 120 MN/m2 stress.

[8 Marks]

Source: IES Master Conventional Question Practice Book Page No. 20 Question No. 17





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ASTER

1.(e) A water main of 1200 mm internal diameter and 12 mm thick is running full. If thebending stress is not to exceed 56 MPa, find the longest span on which the pipe may befreely supported. Steel and water weight 76.8 kN/m3 and 10 kN/m3 respectively.

[12 Marks]

Source: CQPP 2019 Full Test-3 Q. 5(e)

2.(a) (ii) What are the various factors that promote the Alkali Aggregate Reaction ? How canthis be controlled ?

[8 Marks]

Source: IES Master Booklet Bulding Material From Page No. 93

2.(b) (i) Three vertical rods carry a tensile load of 100 kN. Area of cross-section of each rodis 500 mm2. Their temperature is raised by 60°C and the load is now so adjusted thatthey extend equally. Determine the load shared by each. The outer two rods are ofsteel and the middle one is of brass.

6 6S B S BE 2E 210GPa. 11 10 C ; 18 10 C

IES M

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[12 Marks]

Source: IES Master Booklet Strength of Material From Page No. 46

2.(b) (ii) A solid steel shaft has to transmit 75 kW at 200 rpm. Taking allowable shear stress as70 N/mm2, find suitable diameter for the shaft, if the maximum torque transmitted ateach revolution exceeds the mean by 30%.

[8 Marks]

Source: CQPP 2019 Test-1 Q. 2(c)

2.(c) A uniformly distributed load of 40 kN/m and 5 m long crosses a simply supported beam ofspan 15 from left to right. Draw the influence line diagram for shear force and bendingmoment at a section 6 m from left end. Use these diagrams to get the maximum shear forceand bending moment at this section.

[20 Marks]

Source: IES Master Booklet Structure Analysis From Page No. 402





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ASTER

3.(b) (ii)

Strain Gauge

F

P

200 mm200 mm

100 m

Strain Gauge

4 mm

12 mm

12 mm

4 mm

4 mm

A small T-section is used in inverted positions as a beam and is shown in figure overa span of 400 mm. If due to the application of forces shown, the longitudinal straingauge at F registers a compressive strain of 1500 microstraints, determine the magnitudeof P. Take E = 200 GPa.

[10 Marks]

Source: CQPP 2019 Test-4 Q. 6(b)

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4.(a) (i) Write briefly about the following :(A) Air Entraining admixtures(B) Role of Flyash as a part replacement of cement.

[10 Marks]

Source: IES Master Booklet Bulding Material From Page No. 106 & 108





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4(a) (ii) Calculate the quantities of ingredients required to produce one cubic meter of structuralconcrete. The mix is to be used in the proportions of 1 part of cement of 1.42 parts ofsand to 2.94 parts of 20 mm nominal size crushed coarse aggregate by dry volumeswith a w/c ratio of 0.49 (by mass). Assume the bulk densities of cement, sand andcoar se aggr egate to be 1500, 1700 and 1600 kg/m3 respectively. The percentage ofentrained air is 2.0. Take specific gravity of cement, sand and coarsed aggregate as3.15, 2.6 and 2.6 respectively.

[10 Marks]

Source-1: IES Master Conventional Question Practice Book Page No. 188 Question No. 4

Source-2: CQPP 2019 Test-7 Q. 3(a)(ii)

4.(b) (i) Explain briefly with an example of the Acceptance Criteria for Concrete as per IS 456-2000.

[8 Marks]

IES M

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Source: IES Master Booklet RCC From Page No. 2

4.(c) A suspension cable of 160 m span and 16 m central dip carries a load of 1 2kN per linearhorizontal meter. Calculate the maximum and minimum tension in the cable. Also find thehorizontal and vertical forces in each pier under the following alternate conditions.(i) If the cable passes over the frictionless pulley on the top of the piers.(ii) If the cable is firmly clamped to saddles carried on frictionless roller on the top of the

piers.In each case the backstay is inclined at 30° to the horizontal.

[20 Marks]

Source: IES Master Booklet Structure Analysis From Page No. 546





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SECTION ‘B’

5.(a) In a roof truss, a diagonal consists of an ISA 60 mm × 60 mm × 8 mm (ISA 6060 @ 0.07 kN/m) and it is connected to gusset plate by one leg only by 18 mm diameter rivets in one chainline along the length of the member. Determine tensile strength of the member, if yieldstress for steel is 250 MPa.

[12 Marks]

Sol. We will follow the recommendation of IS 800 : 1984 since the necessary data for analysis is not givenlike the location of connection of bolt, fu.

Diameter of rivet hole = 18 + 1.5 = 19.5 mmNet effective area provided. Aeff = A1 + KA2

Where, A1 = Net sectional area of the connected legA2 = Area of the outstanding leg.

If angle connected by one leg only

K =1

1 2

3A3A A

Here, A1 = 2860 19.5 8 292 mm2

A2 = 2860 8 448 mm2

K =3 292 0.6616

3 292 448

Aeff = 292 + 0.6616 × 448 = 588.41 mm2

Allowable tensile stress, (fa) = 2y0.6 f 0.6 250 150 N/mm

So, Tensile strength = fa × Aeff = 150 × 588.41= 88.261 kN

5.(c) A prestressed concrete beam supports an imposed load of 6.5 kN/m over an effective spanof 12 m. The beam has a rectangular section of width 250 mm and depth of 700 mm. Findthe effective prestressing force in the cable if it is parabolic with an centricity of 110 mmat the centre and zero at the ends, for the following conditions :

(i) If the bending effect of the prestressing force is nullified by the imposed load for themid-span section (neglecting self weight of the beam).

(ii) If the resultant stress due to self-weight, imposed load and prestressing force is zeroat the soffit of the beam for the mid-span section. Assume the density of concrete is 24kN/m3.

[12 Marks]

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IES Master Conventional Question Practice Book Page No. 189and 190 Question No. 18 and Q. 24

5.(d) Define the terms activity, event and Net work.

[12 Marks]

Sol.

Source-1: IES Master Conventional Question Practice Book PageNo. 237 Question No. 11

Source-2: IES Master Booklet PERT CPM From Page No. 46





IES M

ASTER5.(e) Find the moment of resistance of a beam 300 × 600 mm deep if it is reinforced with 3 Nos.

of 20 mm dia. bars in compression and tension, each at an effective cover of 40 mm. UseM 20 grade concrete and steel grade Fe415.

Points on stress-strain curve for Fe 415 steel

Stress levelFe 415 grade

Strain Stress (N/mm )2

0.80 fy

0.85 f0.90 f0.95 f0.975 f1.00 f

y

y

y

y

y

0.001440.001630.001920.002410.002760.00380

288.7306.7324.8342.8351.8360.9

[12 Marks]

Source: CQPP 2019 Full Test-2 Q. 1(d)

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ASTER







6(a) (ii) A pitched roof to be provided for a workshop of effective span 18 m. The trusses arespaced at 4 m centre to centre and purlins at 1.6 m centre to centre. The pitch of theroof is 28°, weight of the roofing material is 0.162 kN/m, normal wind pressure is 1.2kN/m2 and permissible bending stress is 165 MPa. check the suitability of ISLB 12575@ 0.119 kN/m section for purlins, if IXX = 406.8 cm4 and IYY = 43.4 cm4 for given section.

[14 Marks]

Source: CQPP 2019 Full Test-2 Q. 1(d)

6.(b) Design a two way slab for an office room 5.8 m × 4.2 m clear in size if the superimposedload is 4 kN/m2. Use M 25 grade of concrete and steel grade Fe415. The bending momentcoefficients for two-way slabs simply supported on four sides is given below :

y x

x

y

l / l 1.0 1.1 1.2 1.3 1.4 1.5 1.75 2.00.062 0.074 0.084 0.093 0.099 1.104 0.113 0.1180.062 0.061 0.059 0.055 0.051 0.046 0.037 0.029

Assume the edges simply supported and the corners not held down. Assume the shape factorfor shear k = 1.3.Design shear strength of concrete of M 25 grade.

2st c100 A / bd N/mm

0.25 0.360.50 0.490.75 0.571.00 0.64

[20 Marks]





IES M

ASTER

Source-1: CQPP 2019 Test-7 Q. 6(a)]

Source-2: Class-notes

7.(a) Design the counter forts of a retaining wall to retain earth for a height of 6.5 m above theground level. The unit weight of soil is 16 kN/m3 and the angle of repose of soil is 30°. thesafe bearing capacity of soil is 180 kN/m2. Use M 20 grade concrete and steel of grade Fe415. The cross-section of the retaining wall is given below. The spacing of counterfort istaken as 3.5 m. Assume a cover of 40 mm for counterforts.

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200

6500

11001300

4500

400

3200

All dimensions are in mm.Assume the maximum pressure at toe end is 166.05 kN/m2 and the minimum pressure at theheel end is 38.92 kN/m2. Sketch the reinforcement details.

[20 Marks]

Source: CQPP 2019 Test-6 Q. 4(c)(i)

questions for ies master reso€¦ · 4.(c) a suspension cable of 160 m span and 16 m central dip...

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