Civil Engineering Test

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Civil Engineering Test - 5

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Weekly Quiz Competition

Question 1
2 / -0.66

A prismatic bar of cross-sectional area 1 mm² and E = 200 GPa is fastened between two rigid walls at A and B and are subjected to loads as shown.

The support reactions at B and A (in kN) are

A
The support reactions at B is 12.77 kN

B
The support reactions at A is 24.93 kN

C
The support reactions at A is 45.32 kN

D
The support reactions at B is 20.86 kN

Solution
Question 2
2 / -0.66

A cast-in-situ bored pile 0.50 m diameter and 10 m deep is placed in a purely cohesive soil. If the cohesion of the soil is 4t/m² and adhesion between the pile and the soil is half the value of cohesion, then the ultimate bearing capacity of the pile is given by

A

B

C

D

Solution

Concept:

Ultimate load carrying capacity for piles in clays can be given as,
Question 3
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If staff readings taken on B and C by a tacheometer placed at A are

Staff Distance (m) Stadia Reading

B 120 1.23 1.81 2.39

C 200 0.95 1.93 2.91

Calculate the sum of multiplying and additive constants of the tacheometer(in integer).

A
104

B
105

C
107

D
103

Solution

Concept:

Distance from instrument to staff by tachometer is given as,

D = KS + C

K = Multiplying constant, S = Staff intercept, C = Additive constant

Calculation:

Given, D_B = 120m, D_C = 200 m,

S_B = 2.39 – 1.23 = 1.16 m

S_C = 2.91 – 0.96 = 1.96 m

Therefore,

120 m = K (1.16) + C -------(1)

200 m = K (1.96) + C -------(2)

From (1) & (2)

80 = 0.8K

K = 100, C = 4

K + C = 104

Question 4

2 / -0.66

The longitudinal section of the runway provides the following data:

End to end of runways (m)	Gradient (%)
0 to 200	+1
200 to 600	- 1.5
600 to 1200	+ 0.8
1200 to 1600	+1.2
1600 to 2000	-0.5

Calculate the effective gradient of the section.

0.25 %

0.96 %

0.48 %

0.62 %

Solution

Question 5
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Determine the thickness (in mm, round to next even integer) of a bearing plate at the support for ISMB 600 resting on a concrete masonry wall 250 mm thick for the following data.

Reaction = 200 kN

Grade of concrete: M20

Properties of ISMB 600 @ 1202.71 N/m are:

b_f = 210 mm, t_f = 20.8 mm, t_w = 12 mm, Radius at root = 20 mm

A
22

B
23

C
25

D
26
Solution
Concept-
- The area of the plate required is calculated by dividing the bearing pressure from the masonry to the reaction.
- For concrete bearing pressure is given by 0.45 f_ck.
- The thickness of the bearing plate will be,
Question 6
2 / -0.66

To control vehicular pollution from exhaust of vehicles, following is fitted:

A
Electrostatic precipitator

B
Catalytic converter

C
Bag filter

D
Cyclone separator

Solution

Catalytic Convertor is a vehicular pollution control device used in automobiles, which converts the toxic gases pollutants present in engine exhaust to less toxic pollutants by filtering or absorbing by a catalyst & also a chemical reaction.

It converts nitrogen oxide, carbon monoxide & hydrocarbon like harmful products into carbon dioxide, water vapour & nitrogen gas like less harmful products.

Electrostatic precipitator: It is a device that removes suspended dust particles from a gas or exhaust by applying a high-voltage electrostatic charge and collecting the particles on charged plates.

Cyclone separators are separation devices (dry scrubbers) that use the principle of inertia to remove particulate matter from flue gases.

A bag filter is an air pollution control device and dust collector that removes particulates out of air or gas released from commercial processes or combustion for electricity generation.
Question 7
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The concentration of OH- ion in a water supply is measured as 17 mg / L at 25° C. What is the pH of the water sample?

A
12

B
13

C
10

D
11

Solution

Explanation

Concentration [X] in mg/L = (Concentration [X] in mol/lt) x (Molecular weight of X) x 1000

∴ 17 = (X) x 17 x 1000

X = 10^-3 mol/lt
Question 8
2 / -0.66

A sub grade soil sample was tested using standard CBR apparatus and the observations are given below.

Load (kg)

Penetration (mm)

68.5

2.5

88.5

5.0

Assuming that the load-penetration curve is convex throughout, the CBR value (%) of the sample is

A
4.70%

B
7.5%

C
4.30%

D
5%

Solution

Concept:

CBR test is a strength test conducted on the soil by introducing surcharge load at the compaction rate of 1.25 mm per minute on a completely soaked soil sample passing through 20 mm sieve size.
Question 9
2 / -0.66

A cantilever beam of length L and flexural modulus EI is subjected to a point load P at the free end. The elastic strain energy stored in the beam due to bending (neglecting transverse shear) is

A

B

C

D

Solution
Question 10
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A
c

B
c + 1

C

D

Solution