# All India Civil Engineering (CE) Group

## A steel bar is stretched between rigid supports .the initial tensile stress in the bar is 30mpa,when the temperature is 200C.if the temperature in the bar is droped to 0C.?

 Tanvi Sarkar answered  •  5 hours ago

Initial Conditions:

- Initial tensile stress: 30 MPa
- Initial temperature: 20°C

Effect of Temperature Change:

When the temperature of the bar is dropped to 0°C, the bar will contract due to thermal contraction. This contraction will induce compressive stress in the bar.

Calculating the Final Stress:

To calculate the final stress in the bar at 0°C, we can use the formula:

$\sigma_f = \sigma_i + \alpha \cdot E \cdot \Delta T$

where:
- $$\sigma_f$$ = Final stress
- $$\sigma_i$$ = Initial stress
- $$\alpha$$ = Coefficient of thermal expansion of steel
- $$E$$ = Young's Modulus of steel
- $$\Delta T$$ = Change in temperature

Final Stress Calculation:

Given:
- Coefficient of thermal expansion of steel, $$\alpha$$ = 12 x 10^-6 /°C
- Young's Modulus of steel, $$E$$ = 200 GPa = 200 x 10^3 MPa
- Change in temperature, $$\Delta T$$ = 20°C

Substitute these values into the formula to calculate the final stress in the bar at 0°C.

Conclusion:

After the temperature drop to 0°C, the final stress in the steel bar can be calculated using the formula mentioned above. It is important to consider the thermal expansion and contraction effects when analyzing the behavior of materials subjected to temperature changes.

## First step in this method is to find stiffness coefficient.State whether the above statement is true or false.a)trueb)falseCorrect answer is option 'B'. Can you explain this answer?

 Tanvi Sarkar answered  •  5 hours ago

Explanation:

Finding the stiffness coefficient is not the first step in the method for solving structural analysis problems. The correct first step usually involves defining the problem, gathering all the necessary information such as loads, materials, and boundary conditions, and creating a model of the structure.

Here is a breakdown of the typical steps involve
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## Find the inner and Outer diameter of hollow Steel shaft subjected to Torque of magnitude 13,000lb and having premissible shear stress of 9000psi.the outer diameter istwice the innner diameter?

 Tanvi Sarkar answered  •  5 hours ago

Given Data:
- Torque (T) = 13,000 lb
- Permissible shear stress (τ) = 9000 psi

Assumptions:
- Material of the shaft is steel
- The outer diameter is twice the inner diameter

Calculations:
Let the inner diameter be d inches. Therefore, the outer diameter will be 2d inches.

Torque transmitted through the shaft:
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## The accident cost analysis is estimated by conductinga)Origin and destinationb)Traffic surveyc)Transportation facilitiesd)Geometric designCorrect answer is option 'B'. Can you explain this answer?

 Tanvi Sarkar answered  •  5 hours ago

Importance of Traffic Survey in Accident Cost Analysis:

Traffic survey is a crucial component in estimating accident cost analysis as it provides valuable data on the volume and flow of traffic in a particular area. Here's why it is essential:

Accurate Data Collection:
- Traffic surveys help in collecting accurate data on the number of vehicles
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## An open channel carries water with a velocity of 0.605 m/s. If the average bed shear stress is 1 N/m2, then the Chezy’s constant C is equal toa) 6b) 60c) 7d) 70Correct answer is option 'B'. Can you explain this answer?

 Bhavya Rane answered  •  14 hours ago

Calculating Chezy’s constant (C):

- The Chezy’s formula is given by: $$V = C \sqrt{RS}$$, where V is the velocity of flow, R is the hydraulic radius, and S is the slope of the channel.
- The bed shear stress (τ) is related to the Chezy’s constant by: $$\tau = \rho g R S$$, where ρ is the density of water and g is the acceleration due to grav
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A

## The discharge through a rectangular channel is 16.62 m3/s and the wetted area is equal to 12m2. The width of the channel is 6m and the bed slope is 1 in 1000, calculate the value of the Chezy’s constant.a)35b)40c)45d)50Correct answer is option 'B'. Can you explain this answer?

The Chezy formula is given by:

Q = C * A * sqrt(S)

Where:
Q = discharge (m^3/s)
C = Chezy coefficient
A = cross-sectional area of flow (m^2)
S = bed slope

Given:
Q = 16.62 m^3/s
A = 12 m^2
S = 1/1000
Width of the channel = 6m

First, calculate the hydraulic radius (R) using the formula:

R = A/Wetted perim
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## Consider the following logical inferences.I1: If it rains then the cricket match will not be played.The cricket match was played.Inference: There was no rain.I2: If it rains then the cricket match will not be played.It did not rainInference: The cricket match was played.Which of the following is TRUE?a)Both I1 and I2 are correct inferencesb)I1 is correct but I2 is not a correct inferencec)I1 is not correct but I2 is a correct inferenced)Both I1 and I2 are not correct inferencesCorrect answer is option 'B'. Can you explain this answer?

Explanation:

I1:
- The given statement is: "If it rains then the cricket match will not be played."
- Inference I1 states: "The cricket match was played."
- From the given statement, we can infer that if it rains, the cricket match will not be played. However, the statement does not provide any information about what happens if it does not rain. Theref
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## Which one of the following is NOT a technique of inventory control?a)ABC analysisb)FSN analysisc)GOLF analysisd)FTMN analysisCorrect answer is option 'D'. Can you explain this answer?

Inventory Control Techniques

ABC Analysis
ABC analysis is a technique used for categorizing inventory items based on their importance. Items are classified into three categories - A, B, and C - based on their value and contribution to overall inventory costs.

FSN Analysis
FSN analysis is a technique used to classify inventory items b
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## The process of maintaining or improving the performance of a soil as a constructional material, usually by the use of admixtures, is known as:a)Soil explorationb)Soil stabilizationc)Soil compactiond)Soil consolidationCorrect answer is option 'B'. Can you explain this answer?

Soil Stabilization

Soil stabilization is the process of maintaining or improving the performance of a soil as a construction material. This process is essential in ensuring the durability and strength of structures built on the soil.

Methods of Soil Stabilization

- Mechanical Stabilization: This method involves physically changing t
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## Consider the given statement/s to be true and decide which of the given conclusions/assumptions can definitely be drawn from the given statements.Statements:I. All elephants are men.II. All men are socks.Conclusions:I. Some socks are elephants.II. All elephants are socks.a)Only Conclusion I followsb)Only Conclusion II followsc)Both Conclusions I and II followd)Neither conclusion I nor II followsCorrect answer is option 'C'. Can you explain this answer?

Given Statements:

I. All elephants are men.
II. All men are socks.

Conclusions:

I. Some socks are elephants.
II. All elephants are socks.

Explanation:

Conclusion I:
- From statement I, we know that all elephants are men.
- From statement II, we know that all men are socks.
- Combining
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## In a pipe of diameter 5 cm, water is flowing at a rate of 8 cm/sec. If the dynamic viscosity of water is 1.6 × 10-2 Pa-s, what type of flow is present?a)Laminar flowb)Transient flowc)Turbulent flowd)Cannot sayCorrect answer is option 'A'. Can you explain this answer?

× 10^-3 Pa·s, calculate the Reynolds number for this flow.

Reynolds number (Re) is defined as the ratio of inertial forces to viscous forces in a fluid flow. It is given by the formula:

Re = (ρ * v * D) / μ

where:
ρ = density of the fluid = 1000 kg/m^3 (density of water)
v = velocity of the fluid = 0.08 m/s (converted from 8 cm/sec to m/s)
D = diamet
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## The observed N value from a standard penetration test conducted on a saturated sandy soil stratum is 35. The corrected N value for dilatancy can be estimated as:a)25b)45c)20d)15Correct answer is option 'A'. Can you explain this answer?

 Ishani Basu answered  •  2 days ago

Explanation:

1. Standard Penetration Test (SPT) N value:
- The observed N value from the standard penetration test conducted on a saturated sandy soil stratum is 35.

2. Correcting for Dilatancy:
- When correcting for dilatancy in sandy soils, the N value is typically reduced by about 10 units.
- This correction is made to account for
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## As applied to staff readings, the corrections for curvature and refraction are respectivelya)+ and –b)– and +c)+ and +d)– and –Correct answer is option 'B'. Can you explain this answer?

 Ishani Basu answered  •  2 days ago

Corrections for Curvature and Refraction in Staff Readings:

Corrections:
- When taking staff readings, it is essential to account for both curvature and refraction in order to obtain accurate measurements.
- The correction for curvature is necessary due to the Earth's curvature, which causes the line of sight to be slightly higher than the staff reading wo
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## Differential manometer has gauge difference of 0.5 m difference in pressure?

 Ishani Basu answered  •  2 days ago

Explanation of Differential Manometer with 0.5m Gauge Difference

The differential manometer is a device used to measure the pressure difference between two points in a fluid. In this case, the gauge difference is 0.5m, which means there is a difference in pressure of 0.5 meters of the fluid column.

Working Principle of Differential Manometer

- T
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## The range of concrete’s failure strain in uniaxial tension is found to be:a)0.001 - 0.02b)0.0002 - 0.0005c)0.05 - 1.0d)0.0001 - 0.0002Correct answer is option 'D'. Can you explain this answer?

 Anmol Roy answered  •  2 days ago
Is vast, with applications in construction, infrastructure, and architecture. From high-rise buildings and bridges to sidewalks and driveways, concrete is a versatile and durable material that can be molded and shaped to fit a wide range of needs. It is also used in the construction of roads, dams, and other critical infrastructure projects. In the realm of architecture, concrete is often used for... more

## Uniformity coefficient is also known as ______a)water conveyance efficiencyb)consumptive use efficiencyc)water distribution efficiencyd)water storage efficiencyCorrect answer is option 'C'. Can you explain this answer?

 Anmol Roy answered  •  2 days ago

Water Distribution Efficiency

Uniformity coefficient is a measure of the uniformity of water distribution in irrigation systems. It indicates how evenly water is applied across a field or area.

Definition

The uniformity coefficient (UC) is defined as the ratio of the average application rate to the highest application rate. A low uniformity coe
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## The liquid forms of particulate air pollutants area)fly ash and fumesb)dust and mistc)mist and sprayd)smoke and sprayCorrect answer is option 'C'. Can you explain this answer?

 Anmol Roy answered  •  2 days ago

Types of Liquid Forms of Particulate Air Pollutants:

Particulate air pollutants can exist in various forms, including liquid forms. The two common types of liquid forms of particulate air pollutants are mist and spray.

Mist:
- Mist is a suspension of tiny liquid droplets in the air.
- It is formed when liquid particles are dispersed in the air th
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## Which of the following is not an overhead cost?a)Rent and taxesb)Stationary expensec)Establishment chargesd)Materials costCorrect answer is option 'D'. Can you explain this answer?

 Poulomi Khanna answered  •  2 days ago

Materials cost is not an overhead cost

Overhead costs are the ongoing expenses of operating a business that are not directly attributed to creating a specific product or service. Materials cost, on the other hand, are directly related to the production of goods or services and are considered a direct cost rather than an overhead cost.

Here are some key points to
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## If in a closed traverse, the sum of the north latitudes and also the sum of west departures ismore than the sum of the east departures, the bearing of the closing line is in the a)NE quadrant b)NW quadrant c)SE quadrant d)SW quadrant Correct answer is option 'B'. Can you explain this answer?

 Musavir Sheikh answered  •  2 days ago
Answer will be SE because bearing of closing line is measured in opposite direction

## The suitable method of forecasting population for a young and rapidly increasing city isa)Arithmetic methodb)Geometrical increase methodc)Incremental increase methodd)Graphical methodCorrect answer is option 'B'. Can you explain this answer?

 Partho Singh answered  •  2 days ago

Geometrical increase method for forecasting population:

Population forecasting for a young and rapidly increasing city like in this scenario requires a method that takes into account the exponential growth trend. The geometrical increase method is the most suitable approach for such a situation. Here's why:

Understanding the method:
- Geometrica
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## Which one of the following statements is NOT correct?a)When the water content of soil lies between its liquid limit and plastic limit, the soil is said to be in plastic state.b)Boussinesq’s theory is used for the analysis of stratified soil.c)The inclination of stable slope in cohesive soil can be greater than its angle of internal friction.d)For saturated dense fine sand, after applying overburden correction, if the Standard Penetration Test value exceeds 15, dilatancy correction is to be applied.Correct answer is option 'B'. Can you explain this answer?

 Naina Das answered  •  3 days ago
B) Boussinesq

## The Bernoulli's equation is written with usual notation as p/w + v2/2g + z = constant. In this equation each of the terms representsa)energy in Kg.m/Kg mass of fluidb)energy in N.m/Kg mass of fluidc)energy in N.m/N weight of fluidd)power in kw/Kg mass of fluidCorrect answer is option 'C'. Can you explain this answer?

 Naina Das answered  •  3 days ago

Explanation:

Energy in N.m/N weight of fluid:
- The Bernoulli's equation represents the conservation of energy for flowing fluids.
- The terms in the equation represent different forms of energy per unit weight of fluid.
- The term p/w represents the pressure energy per unit weight of fluid.
- The term v^2/2g represents the kinetic energy pe
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## According to I.S. 456-1978, the thickness of reinforced concrete footing on piles at its edges is kept less than a)5 cm b)10 cm c)15 cm d)20 cm Correct answer is option 'C'. Can you explain this answer?

 Anuj Chakraborty answered  •  3 days ago
Explanation:

Reinforced Concrete Footing on Piles

- The thickness of reinforced concrete footing on piles at its edges is governed by the guidelines provided in I.S. 456-1978.
- The purpose of keeping the thickness less at the edges is to ensure proper load distribution and structural stability.

Guidelines in I.S. 456-1978

- Acc
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