RRB JE CE (CBT II) Mock Test- 4 - Civil Engineering (CE) MCQ

• Nikoloz Basilashvili emerged victorious after a three-set battle with Andrey Rublev to successfully defend his title at the German Tennis Championships.

• The reigning champion claimed his 12th straight win in Hamburg 7-5 4-6 6-3.

• With the win, he has become the first player to win the event in successive years since Roger Federer in 2004-2005.

Loads on Purlins are as follows:

Gravity Loads = P kN/m (Dead Load + Live Load)

Wind Loads = w kN/m

Moment for which purlins is designed:

Moment along z−z axis ⇒M_z−z=(w+P cos⁡θ)×(L/10)

Moment along y−y axis ⇒My−y=(P cos⁡θ)×(L²/10)

Converting uniform distributed to total load. For e.g. w × L = W

∴ In general, Maximum bending moment in roof purlins is taken as WL/10.

• It is also called as a tree system, it consists of one main supply line, from which originates (generally at right angles) a number of sub main pipes. Each submain is then divided into several branch pipes, called laterals.

• This type of distribution system is suitable for older towns which have developed in a haphazard manner, without properly planned road e.g. old city, irregularly grown city, etc. It is economical and simple.

Gridiron System:

• It is also known as interlaced system or reticulation system, the mains, sub-mains, and branches are all connected with each other.

• There is no dead end in the system as looping is provided and is most suitable for well-planned cities. There is equal pressure in all pipe and multiple flow path.

Radial system:

• If a city or town is having a system of radial roads emerging from different centers, the pipeline can be best laid in a radial method by placing the distribution reservoir at these centers.

• The water from distribution reservoir is then supplied radially to distribution pipes and thus also known as zonal distribution.

Ring System:

• It is also called a circular system. In this system, a closed ring, either circular or rectangular, of the main pipes, is formed around the area to be served. The distribution area is divided into rectangular or circular blocks, and the main water pipes are laid on the periphery of the blocks.

• This system is very suitable for towns and cities having well-planned roads. It is economical and pressure at the ends are reasonably equal.

Prandtl mixing length is zero at the pipe wall as the flow is laminar i.e. negligible velocity fluctuation at the boundary of the pipe wall.

ii) Useful storage: The volume of water stored in the reservoir between normal and minimum pool level is called useful storage.

iii) Surcharge Storage: The volume of water stored between the maximum pool and normal pool levels is called surcharge storage.

iv) Valley Storage: Before constructing the dam, a variable amount of water stored in the stream channel is called valley storage.

After construction of the dam, storage increases, and there is a net increase in the storage is equal to the storage capacity of a reservoir minus natural valley storage.

Effective storage for flood mitigation = Useful Storage + Surcharge Storage–Valleys Storage

∴ The volume of water held by a natural stream channel is known as Valley Storage.

i) The window area should be 15 – 20 percent of the floor area.

ii) For every 30 m³ internal volume, there should be at least 1 m² of a window opening.

iii) The windows are located at the height of 0.75 to 0.90 meters from the floor level.

iv) For bathrooms, the level of the windows may be about 2 m above the ground level.

The different crushers used for the production of aggregates are as follows:

i. Jaw crusher

ii. Gyratory crusher

iii. Cone crusher

iv. Roll crusher

v. Hammer Mill

vi. Road Mill and Ball Mill

The length of gyratory crusher is limited about 20 cm to 200 cm.

• Vikram Seth is the author of the book named ‘A Suitable Boy’.

• The novel revolves around the story of four families over a period of 18 months.

Variance,

where

t₀ = optimistic time

t_M = most likely time

t_P = pessimistic time

The probable range is from (t_E – 3σ) to (t_E + 3σ)

Two types of test apparatus may be used for conducting flash point tests on bitumen, namely the Pensky-Martens Closed Cup Tester and Open Cup Tester.

If the bituminous binder is further heated to a temperature higher than the flashpoint, the binder material itself catches fire and continues to burn, the lowest temperature causing this condition is called the "fire point.”

Fire Point: It is the lowest temperature at which application of a test flame causes the binder material to ignite and burn at least for five seconds under specified test conditions.

Note: The fire point is always higher than the flashpoint of a material.

Pensky-Martens Open Cup Tester is used to determine the fire point of the bituminous binders.

1. For the main title: 6 mm × 6 mm to 12 mm × 12 mm

2. For subtitle and headings: 4 mm × 4 mm to 5 mm × 5 mm

3. Notes, dimensions, Construction Notes, etc: 2 mm × 2 mm to 4 mm × 4 mm

1. reduce the water – cement ratio thus to improve the workability of concrete.

2. To delay the setting time of cement.

Note: Admixtures has no direct affect on the strength of concrete

• Microsoft Excel is the electronic spreadsheet program within the Microsoft Office suite.

• An electronic spreadsheet is an application used to perform numeric calculations and to analyze and present numeric data.

• In Excel, the electronic spreadsheet is called a worksheet, and it is contained in a file called a workbook, which has the file extension .xlsx

• Cells are the basic unit for storing data.

• In any spreadsheet program such as Excel, each rectangular box is referred to as a cell

• A cell is the intersection point of a column and a row

• Data entered into an Excel spreadsheet is entered into a cell

• Each cell can hold only one piece of data at a time

• The 20th Anniversary of Kargil Vijay Diwas was celebrated on 26 July 2019.

• The day is named after the successful Operation Vijay in 1999, when India regained control of the high outposts which Pakistan had stealthily taken over.

• The celebrations of 20th Anniversary of Kargil Vijay Diwas began in Delhi on 14 July 2019.

• UNCTAD is the principal organ of the UN General Assembly dealing with trade, investment, and development issues.

• The organization's goals are to "maximize the trade, investment and development opportunities of developing countries and assist them in their efforts to integrate into the world economy on an equitable basis”.

• The headquarters of the United Nations Conference on Trade and Development is located in the Palace of Nations (United Nations Office at Geneva, Switzerland).

Mass of solvent (water) = 320 g

We know,

Mass of solution = Mass of solute + Mass of solvent

= 40 g + 320 g

= 360 g

mass percentage of solution mass percentage of solution = (40/360) x 100 = 11.11%

i. 40% excess force than carried by the outstanding leg of main angle section.

ii. 20% excess force than carried by the outstanding leg of the main channel section.

So, the camber of the road should be approximately equal to half of the longitudinal gradient.

1. Slab = 15 mm

2. Beam = 25 mm

3. Column = 40 mm

4. Footings = 75 mm.

Agricultural waste is waste produced as a result of various agricultural operations. It includes manure and other wastes from farms, poultry houses and slaughterhouses; harvest waste; fertilizer run off from fields; pesticides that enter into the water, air or soils; and salt and silt drained from fields.

A pathogen or infectious agent is a biological agent that causes disease or illness to its host.

1. Needle scaffolding or Cantilever scaffolding

2. Suspended scaffolding

3. Mason’s scaffolding or Double scaffolding

4. Bricklayer’s scaffolding or Single scaffolding

5. Trestle scaffolding

6. Steel scaffolding

7. Patented scaffolding

Trestle and suspended scaffolding are majorly used for minor works such as painting, pointing, whitewashing, distempering, etc.

• phagu Chauhan, a six-time member of the Uttar Pradesh Assembly, was sworn in as the 29th Governor of Bihar on 29 July 2019.

• He was administered the oath of office by Chief Justice of Patna High Court Amreshwar Pratap Shahi at the Raj Bhavan in Patna.

• Chief Minister Nitish Kumar, Deputy Chief Minister Sushil Kumar Modi and several other leaders were present during the ceremony.

(i) Plane sections normal to the axis remain plane after bending.

(ii) The maximum strain in concrete at the outermost compression fibre is taken as 0.0035 in bending.

(iii) The acceptable stress-strain curve of concrete is assumed to be parabolic, as shown in the figure below:

(iv) The tensile strength of concrete is ignored.

(v) The design stresses of the reinforcement are derived from the representative stress-strain curves as shown in the figure below:

Partial safety factors for steel and concrete should be considered as 1.15 and 1.5, respectively.

(vi) The maximum strain in the tension reinforcement in the section at failure shall not be less than (f_y/1.15E_s )+0.002,

where f_y is the characteristic strength of steel and E_s = modulus of elasticity of steel.

In the case of uniaxial stress, maximum principal stress σ1 and minimum principal stress σ2 will be PA and zero, respectively.

Maximum shear stress (\tau)

Plane of maximum shear stress,

tan⁡2θ=∞,⇒θ=45^∘

∴ The maximum shear stress and its inclination with the direction of load, respectively, are P/2A and 45°.

Reciprocal levelling

Reciprocal levelling is adopted to accurately determine the level difference between two points which are separated by obstacles like a river, ponds, lakes, etc.

It eliminates the following errors:

• error in instrument adjustments i.e error due to collimation
• the combined effect of Earth's curvature and the refraction of the atmosphere
• variation in the average refraction