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

Concept:

The yield of a well means the discharge from the well excavated through the given aquifer

Q = nv_a A = KiA

where,

n = porosity

v_a = the actual flow velocity of groundwater

A = the area of the aquifer opening onto the wells

K = the permeability of the soil

From the above relation, we can say that yield of a well (Q) is directly proportional to flow velocity, area of aquifer and permeability of soil.

Rivet hole diameter is calculated as:

• 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.

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

Ctrl + X are shortcut for cut in computer. Similarly, Ctrl + C are shortcut in computer for Copy.

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.

1. Friction between the plates is neglected.

2. Initial tensile stress in the rivet is neglected.

3. The plates are rigid.

4. The rivet fills the hole completely.

5. Deformation of the plates under the load is neglected.

6. Shearing deformation in the rivet is assumed proportional to the shearing stress.

7. Shearing stress in the rivet is assumed to be uniformly distributed over the rivet crossing section.

8. Unit shearing stress in all the joint rivets is uniform.

9. Tensile stress concentration due to rivet holes in the plates is neglected.

10. Bearing stress between rivets and plates is assumed to be uniformly distributed over the nominal contact surface between the rivets and plates.

11. Bending of rivets is neglected.

Hence the option B is correct.

Hence the option C is correct.

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.

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.

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 B.

Hence the correct answer is option C.

Where σ_cbc is the permissible compressive stress.

For M20,

The initial setting time is the period elapsing between the time when water is added to the cement and the time at which the needle fails to pierce the test block by = 5 ± 0.5 mm.

Maximum deflection = Ax/EI = 0.0075 × 1.33

y = 9.975 mm.

Hence, the correct option is (A)

• 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

pH of a water sample is given by

H⁺ = concentration of H⁺ ions (mg/l)

If, pH < 7,="" it="" is="" reported="" as="" />

pH > 7, it is reported as basic

pH = 7, it is reported as neutral

This implies, the lesser the pH value, the stronger the acid is.

So, among 2 and 5,

pH = 2 represents stronger acid.