ESE 2022 CE Technical Quiz 7

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: