ISRO Draughtsman Civil Mock Test - 4 - Civil Engineering (CE) MCQ

Option is A. 2.0 m

• It gives the graphical method of designing the channel dimensions based on Kennedy's Theory.

• The diagram has discharge plotted on the abscissa.

• The ordinates on the left indicate the slope and on the right water depth in the channel & critical velocity Vo.

For a perfectly cohesion-less soil C=0

If the soil normally consolidated (N.C. soil)

For over consolidated soil (OC soil) K_0oc=K₀NC

Where, (μ)= Poisson’s ratio (ϕ)= friction angle (I_P)= plasticity index

O.C.R. = Over consolidated ratio

Porosity- The ratio of the volume of voids to the total volume of the soil mass, i.e. (n=V_v/V)

Voids ratio - The ratio of the volume of holes to the volume of the solids., i.e., e = V_v/V_s

Skidding of vehicle occurs when centrifugal force exceeds lateral friction

i_c = (G + 1) ÷ (1 + e)
= i_c = (2.65 - 1) ÷ (1 + 0.65) = 1

The concrete gains strength due to the hydration of cement.
The concrete does not set at freezing point.
Excessive rates of heating and cooling should be avoided to prevent damaging volume changes. Temperatures in the enclosure surrounding the concrete should not be increased or decreased more than 22°C to 33°C (40°F to 60°F) per hour depending on the size and shape of the concrete element. For example, there is reduced drying shrinkage and creep as compared to concrete cured at 23°C (73°F) for 28 days.
One-day strength increases with increasing curing temperature, but 28-day strength decreases with
increasing curing temperature.

Kaolinite – H₂ bond

Little – Ionic Bond

Montmorillonite – Water bond

Hence the correct answer is option C.

It is that portion of the slab that acts integrally with the beam and extends on either side of the beam forming the compression zone. The effective width of the flange mainly depends upon the span of beams, the thickness of the slab, and the breadth of the web. It also depends upon the type of loads and support conditions.

The effective width of the flange should not be greater than the breadth of the web plus half the sum of clear distances to the adjacent beams on either side.

Hence the correct answer is option B.

Hence the correct answer is option A.

Critical Velocity

Critical Velocity is the maximum velocity of a fluid, above which, the streamline flow get the change to turbulent flow.

• Lower critical Velocity
  (i) It is the velocity at which the laminar flow stops.
  (ii) In this, the flow enters from laminar to transition period which exists between the laminar and turbulent flow.
• Upper Critical velocity
  (i) It is the velocity at which the turbulent flow starts.
  (ii) In this, the flow enters from the transition period to turbulent flow.

Hence the correct answer is option C.

reaction time t = 0.8 sec

length of vehicles L = 5 m

space s = 0.278 Vt + L

= 0.278 x 45 x 0.8 + 5

= 10.008 + 5

= 15.008 m

theoretical capacity C = 1000V/S

= 2998.4

= 2998(say)

So theoretical capacity C = 2998 vehicles/hour/lane

Hence the correct answer is option B.

Hence the correct answer is option D.

To measure the discharge over the broad-crested weir, two heads (i.e., H and h) need to be measured. However, experiments have shown that the flow adjusts itself to have maximum discharge for the available head. The downstream head over the weir can be computed mathematically by differentiating equation (1) with respect to and equating it to zero i.e.

This value of h is known as depth of flow.

Hence the correct answer is option B.

Hence the correct answer is option C.

Grain size - 0.06 - 2mm

Hardness - variable, soft to hard, depends on clast and cement composition.

Colour - variable through a grey, yellow, red to white reflecting the variation in mineral content and cement.

Hence, the correct option is (D)

Hence, the correct option is (C)

Hence, the correct option is (C)

The increase in the volume of sand due to increase in moisture content is known as bulking of sand. A film of water is created around the sand particles which forces the particles to get a side from each other and thus the volume is increased.

The increase in moisture in sand increases the volume of sand. The volume increase in dry sand is known as the bulking if sand. Bulking of sand depends on the quantity of moisture in the sand and also the size of the particles. Five to eight percent of the increase in moisture in the sand can increase the volume of sand up to 20 to 40 percent. Again the finer the sand is more will be the increase in volume and increase in volume will be relatively less for coarser sand.

Hence, the correct option is (D)

Good brick earth should contain about 20% to 30% of alumina.

It is responsible for the plasticity characteristic of the earth, which is essential in a molding operation.

If present in excess, then the raw brick shrink and warps during drying.

• A map is a two-dimensional representation of the earth surface which uses graphics to convey geographical information

• It describes the geographical location of features and the relationship between them; Maps are fundamental to society

• Rectangular coordinates, Scales, and Plotting accuracy are the main important factors that needs to be considered while preparing maps

• Polar coordinates provide a method of rendering graphs and indicating the positions of points on a two-dimensional (2D) surface; It is not used in preparing maps

According to Lacey's theory, the hydraulic mean depth,

where V = velocity of the flow in the channel,

f = Lacey's silt factor