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)
    true
  • b)
    false
Correct 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 conducting
  • a)
    Origin and destination
  • b)
    Traffic survey
  • c)
    Transportation facilities
  • d)
    Geometric design
Correct 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 to
  • a)
    6
  • b)
    60
  • c)
    7
  • d)
    70
Correct 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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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)
    35
  • b)
    40
  • c)
    45
  • d)
    50
Correct answer is option 'B'. Can you explain this answer?

Aniket Pillai answered  •  yesterday
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 rain
Inference: The cricket match was played.
Which of the following is TRUE?
  • a)
    Both I1 and I2 are correct inferences
  • b)
    I1 is correct but I2 is not a correct inference
  • c)
    I1 is not correct but I2 is a correct inference
  • d)
    Both I1 and I2 are not correct inferences
Correct answer is option 'B'. Can you explain this answer?

Aniket Pillai answered  •  yesterday

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 analysis
  • b)
    FSN analysis
  • c)
    GOLF analysis
  • d)
    FTMN analysis
Correct answer is option 'D'. Can you explain this answer?

Sarthak Kulkarni answered  •  yesterday


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 exploration
  • b)
    Soil stabilization
  • c)
    Soil compaction
  • d)
    Soil consolidation
Correct answer is option 'B'. Can you explain this answer?

Bhargavi Sengupta answered  •  yesterday


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 follows
  • b)
    Only Conclusion II follows
  • c)
    Both Conclusions I and II follow
  • d)
    Neither conclusion I nor II follows
Correct answer is option 'C'. Can you explain this answer?

Jithin Choudhury answered  •  yesterday

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 flow
  • b)
    Transient flow
  • c)
    Turbulent flow
  • d)
    Cannot say
Correct answer is option 'A'. Can you explain this answer?

Bhargavi Sengupta answered  •  yesterday
× 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)
    25
  • b)
    45
  • c)
    20
  • d)
    15
Correct 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 respectively
  • a)
    + 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 - 0.02
  • b)
    0.0002 - 0.0005
  • c)
    0.05 - 1.0
  • d)
    0.0001 - 0.0002
Correct 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 efficiency
  • b)
    consumptive use efficiency
  • c)
    water distribution efficiency
  • d)
    water storage efficiency
Correct 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 are
  • a)
    fly ash and fumes
  • b)
    dust and mist
  • c)
    mist and spray
  • d)
    smoke and spray
Correct 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 taxes
  • b)
    Stationary expense
  • c)
    Establishment charges
  • d)
    Materials cost
Correct 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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The suitable method of forecasting population for a young and rapidly increasing city is
  • a)
    Arithmetic method
  • b)
    Geometrical increase method
  • c)
    Incremental increase method
  • d)
    Graphical method
Correct 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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The Bernoulli's equation is written with usual notation as p/w + v2/2g + z = constant. In this equation each of the terms represents
  • a)
    energy in Kg.m/Kg mass of fluid
  • b)
    energy in N.m/Kg mass of fluid
  • c)
    energy in N.m/N weight of fluid
  • d)
    power in kw/Kg mass of fluid
Correct 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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Sipra Das asked a question

Henry Varnum Poor, editor of American Railroad Journal, drew the important elements of the image of the railroad together in 1851, ―Look at the results of this material progress...the vigor, life, and executive energy that followed in its train, rapidly succeeded by wealth, the refinement and intellectual culture of a high civilization. All this is typified, in a degree, by a locomotive. The combination in its construction of nice art and scientific application of power, its speed surpassing that of our proudest courser, and its immense strength, are all characteristic of our age and tendencies. To us, like the telegraph, it is essential, it constitutes a part of our nature, is a condition of our being what we are.
In the third decade of the nineteenth century, Americans began to define their character in light of the new railroads. They liked the idea that it took special people to foresee and capitalize on the promise of science. Railroad promoters, using the steam engine as a metaphor for what they thought Americans were and what they thought Americans were becoming, frequently discussed parallels between the locomotive and national character, pointing out that both possessed youth, power, speed, single-mindedness, and bright prospects.  
Poor was, of course, promoting acceptance of railroads and enticing his readers to open their pocketbooks. But his metaphors had their dark side. A locomotive was quite unlike anything Americans had ever seen. It was large, mysterious and dangerous; many thought that it was a monster waiting to devour the unwary. There was a suspicion that a country founded upon Jeffersonian agrarian principles had bought a ticket and boarded a train pulled by some iron monster into the dark recesses of an unknown future.
To ease such public apprehensions, promoters, poets, editors, and writers alike adopted the notion that locomotives were really only ―iron horses,‖ an early metaphor that lingered because it made steam technology ordinary and understandable. Iron horse metaphors assuaged fears about inherent defects in the national character, prompting images of a more secure future, and made an alien technology less frightening, and even comforting and congenial.  
Essayist Ralph Waldo Emerson saw the locomotive as an agent of domestic harmony. He observed that ―the locomotive and the steamboat, like enormous shuttles, shoot every day across the thousand various threads of national descent and employment and bind them fast in one web, "adding ―an hourly assimilation goes forward, and there is no danger that local peculiarities and hostilities should be preserved. To us Americans, it seems to have fallen as a political aid. We could not else have held the vast North America together, which we now engage to do"
Direction: Read the above Paragraph and answer the follownig Quetions
Q. The passage is primarily concerned with which of the following? 
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