BARC OCES 2022 Quiz 23

Gantry girders are subjected to:

1. Dead load

2. Live load

3. Wind load

4. Lateral load

5. Longitudinal load

6. Impact load

Which of the above loads:

An ISMB 500 is used as a propped cantilever beam of span 15 m. assuming f_y = 250 MPa, calculate plastic moment capacity of the beam. For ISMB 500, I_xx = 4.522 × 10⁸ mm⁴; I_yy = 13.69 × 10⁶ mm⁴. Assume section to be plastic.

In a built up beam gross area of compression flange is 300 cm² and net area of tension flange is 250 cm². If calculated bending compressive stress is 150 MPa, then bending tensile stress is:

Which of the following is NOT correctly matched?

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I

P. Portland pozzolana cement

Q. Burnt clay bricks

R. Brick work construction

S. Preparation and use of masonry mortars

List-II

1. IS : 2212

2. IS : 1077

3. IS : 2250

4. IS : 1489

Codes:

Consider the following statements regarding Cyclopean concrete

1) Size of aggregate is more the 150 mm

2) Size of aggregate is less than 150 mm

3) High slump

4) High temperature rise due to heat of hydration

Which of the above statement are correct

Which of the following explosive contains 21% nitro benzol and 79% potassium chlorate?

A project network diagram is shown in the figure below

Normal time and crash time for each activity are given below

The minimum time required for the completion of the project is:

The initial cost of a obstruction equipment is Rs. 20,00,000 having a useful life of 10 years. The estimated salvage value of the equipment at the end of useful life is Rs. 2,00,000. The book value (in Rs.) of the equipment at the end of 2^nd year using double decline method is:

Consider following statements related to under reamed piles as per IS : 2911 part 3:

1. The diameter of bulb should be two to three times the diameter of shaft.

2. For piles upto 30 cm diameter, spacing between the bulbs should not exceed 1.5 times the diameter of bulb.

3. For expansive soil, top most bulb should be at a minimum depth of two times the bulb diameter below the ground level.

Correct statement(s) is / are:

Following are the details for the backfill material used in a vibroflotation project.

D₁₀ = 0.15 mm, D₂₀ = 0.60 mm, D₅₀ = 2.0 mm

Rating of the backfill material based on the suitability number would be:

A soil profile is shown in figure below. If a uniformly distributed load of 54 KN/m² is applied at the ground surface and the clay is normally consolidated, then the settlement of the clay layer caused due to primary consolidation is. [Take Y_w = 10 kN/m²]

Consider following statements regarding various types of cements and their uses:

1. Initial setting time of rapid hardening cement is less than ordinary portland cement.

2. High Alumina cement should not be used for massive concrete work.

3. Blast furnace slag cement is preferred for marine structures

Correct statement(s) is/are:

Statement (I): Super sulphated cement is preferred for used in construction of dams, retaining walls and other mass concreting work.

Statement(II): super sulphated cement has high resistance to chemical attack

Consider following statements regarding methods of resource allocation:

1) Resource smoothing is done when time constraint takes priority.

2) In resources smoothening resources are considered to be unlimited.

3) In resource levelling peak demand of resources are not crossed.

4) In resource levelling prevent duration is allowed to change.

Correct statements (s) is/are:

Crashing of a network

1) Decreases the project completion time

2) Increases indirect cost

3) Increases number of working hours

4) May change the critical path of the network

of these, correct statement(s) is/are

If the area of cross section of a circular beam is made four times, keeping load, length, support conditions and material of the beam unchanged, then the quantities (List -I) will change through different factors (List-II). Match the List -I with List-II and select the correct answer using the codes given below the lists:

A steel rod as shown is figure possesses an elastic strain energy of 15.70 N – m. Taking Young’s modules as 200 Gpa, the required yield strength in Mpa) of the steel, if the factor of safety with respect to permanent deformation is 4.0:

A column is fixed at both ends. The material of the column has Young’s modules of elasticity, E = 190 kN/mm². Crushing stress,  = 225 N/mm². The slenderness ratio should be:

A 12 – hour storm rainfall with following depths (in cm) occurred over a basin:

1.4, 3.1, 6.5, 4.5, 9.6, 6.2, 7.4, 9.4, 4.6, 3.2, 1.3 and 1.3.

Surface runoff resulting from the above storm is equivalent to 28.5 cm of rainfall depth over the basin. Average infilteration index for the basin will be:

Consider following statement regarding types of cement:

1) High alumina cement is produced by fusing together a mixture of lime stone, bauxite and gypsum.

2) Final setting time of high alumina cement is less than OPC

3) Initial setting time of rapid hardening cement is less than OPC

4) Rapid hardening cement contains higher percentage of C₃S than OPC

Correct statement(s)/are:

If a member is subjected to a compressive stress of 50 N/mm²_, compressive stress of 50 N/mm²_, and tensile stress of 100 N/mm²_, along X, Y and Z directions respectively then the resultant strain along the Z – direction is:

(Take E = 2 x 10⁵ MPa, μ = 0.25)

Hoop strain in a cylindrical vessel is 3.5 times the longitudinal strain. The value of Poisson’s ratio is:

A beam of length l is fixed at its both ends and carries two concentrated loads w₁ and w₂ at a distance of l/4 and 3l/4 respectively from the left end. If fixed end moment at the left support is twice of that at the right support, correct value of ratio  is:

Two point loads of 9 kN and 8 kN spaced at 1m; with 9 kN load leading; roll on a beam from left to right as shown in the figure.

The maximum vertical reaction at ‘C’ is:

The elements of flexibility matrix of a structure:

1. Are dependent of the choice of coordinates

2. Are always dimensionally homogenous

3. Must always be positive

Correct statement (s) is/are:

If the shear reinforcement is not provided in a footing supporting a column of dimension 600 mm x 1000 mm, then the maximum shear stress at critical section using limit state method is: (Take M 25 grade concrete).

As per recommendations made by Is 456 : 2000, side face reinforcement in a RCC beam should be provided when the depth of the beam is more than X mm. However, if the beam is subjected to torsion, the side face reinforcement should be provided if depth of the beam exceeds Y mm. The ratio  has value:

Sample of the water to be used at a construction site was tested in the laboratory and following results were reported:

Chloride Content = 646.52 ppm

Hardness = 130.5 mg/l

pH = 7.80

Consider following statements regarding the water as per IS 456 : 2000.

1. pH of the water is not satisfactory for construction work.

2. Water is suitable any for PCC work and not suitable for RCC work.

3. Hardness of water is within permissible limits.

Correct statements is/are:

Consider following statements related to Khosla’s theory of seepage below a hydraulic structure for a weir shown below :

Consider following expressions as per Lacey’s theory for design of stable channels:

1. Velocity,

2. Perimeter,

3. Silt factor,

4. Slope,

(Symbols have usual meaning)

Correct expressions is/are:

Consider following statements related to wave pressure generated on surface of reservoir behind a gravity dam:

1. Maximum pressure intensity is given by P_w = 2.4 Y_wh_w

2. Maximum pressure intensity occurs at  meters above still water surface.

3. Total pressure due to waves generated is given by Pt = 2γ_wh_w²

4. Total pressure acts at a distance of 0.625 h_w above still water surface.

(h_w = height of waves in meter)

Correct statement(s) is /are :

As per recommendation made by IS 456:2000, minimum cement content in concrete to be used for RCC work at a site under ‘severe’ exposure condition should be:

The loss due to creep in a pre tensioned beam. If the actual stress in concrete at the level of steel is 8.08 N/mm². Take, E_s = 210 kN/mm², E_c = 36.85 kN/mm². ϕ = 1.60

According to the concept of limit state design as per IS 456 : 2000; the probability failure of a structure is.

Which of the following statements is NOT correct:

Which of the following statements with respect to loads on the roof truss as per IS 875 : 2010 is/are correct.

1. For slope of the truss to be more than 10°, live load is assumed to be 1.5 kN/m² minus 0.02 kN/m² for every degree increase in slope above 10° subject to a minimum value of 0.4 kN/m²

2. Snow load is assumed to be 2.5 N/m² for every ‘mm’ depth of snow.

3. Snow load is neglected for slope of the truss greater than 50°.

4. IS 875 part 3 deals with wind loads to be considered for designing buildings and structures.

Statement (I): In design of a gantry girder, it is considered that lateral load and longitudinal load do not act simultaneously.

Statement (II): In a gantry girder crane movement and crab movement are not permitted simultaneously.

Statement (I): The permissible stresses in steel are increased by 33^1/3 percent when the effect of wind or seismic load is taken into account.

Statement (II): The permissible stress in bolts are increased by 66^2/3 percent when the effect of wind or seismic load is taken into account.

The mean drag coefficient for an entirely laminar boundary layer over a flat plate is given by K₁×. Similarly mean drag coefficient for an entirely turbulent boundary layer over a flat plate is given by K₃× correct values of K₁, K₂, K₃ and K₄ are respectively given by:

What would be the critical velocity of water flowing through a rectangular channel of width 4 m carrying discharge of 10 m³/s.

For the fixed steel beam shown in figure below, the value of load P at collapse is given by:

Statement (I): For fine sand below water table, dilatency correction should be applied to ‘N’ (SPT) value, if N > 15.

Statement (II): In granular soil, confining pressure increases with the depth, hence ‘N’ value at shallow depth is underestimated and that at greater depths is overestimated.

Statement (I): Terzaghi’s theory of bearing capacity is applicable for shallow foundation only.

Statement (II): In Terzaghi’s theory, shear strength of the soil above the base of footing is neglected.

In a direct shear test done on a dry sand sample the shear stress is 0.5 kg/cm² and corresponding normal stress is 1.2 kg/cm².

Calculate the shear stress for a sample when normal stress applied is 2 kg/cm².

For nine free standing pile group having arc tan value of 21.2. The efficiency of pile group by converse Labarre formula.

Which of the following statements is NOT correct

Statement (I): Surge tank provided as close to the reservoir as possible.

Statement (II): Surge tank protects the penstock against water hammer.

Statement (I): If velocity potential function (ϕ) satisfies laplace equation, it represents possible steady incompressible rotational flow.

Statement (II): If stream function (ψ) satisfies the laplace equation, it is a possible case of an irrotational flow.