LC Infra Projects Mechanical Engineer Interview Questions and Answers

Q1. Experience related question
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Q2. My self introduction
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Q1. Manufacturing of cement, Durability of concrete, Chemical reaction of cement with water.
Ans. 
The manufacturing of cement involves chemical reactions with water, resulting in the durability of concrete.
• Cement is made by heating limestone, clay, and other materials in a kiln

• The chemical reaction between cement and water, known as hydration, results in the hardening of concrete

• The durability of concrete depends on factors such as the water-cement ratio, curing time, and quality of materials used
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Q2. Why LnT, Where do you see yourself after 5 years, SWOT analysis, About LnT
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Q3. Calculate deflection at the free end of a cantilever beam with a point load at the end
Ans. 
Calculate deflection at free end of cantilever beam with point load at end
• Use the formula: δ = (PL³)/(3EI)

• P is the point load at the end

• L is the length of the cantilever beam

• E is the modulus of elasticity of the beam material

• I is the moment of inertia of the beam's cross-sectional area

• Example: A steel cantilever beam with a length of 2 meters and a point load of 500 N at the end has a deflection of 0.104 mm
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Q4. What is camber, How do we provide camber, Steps for the construction of a Road
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Camber is the slope provided to the road surface to drain off rainwater. It is achieved by raising the center of the road surface.
• Camber is the curvature provided to the road surface to ensure proper drainage of rainwater.

• It is achieved by raising the center of the road surface.

• The amount of camber depends on the width of the road and the expected rainfall.

• The steps for the construction of a road include surveying, cle...read more
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Q5. What is an admixture, How do they affect the concrete, name various admixtures.
Ans. 
Admixtures are chemicals added to concrete to enhance its properties. They affect the workability, strength, and durability of concrete.
• Admixtures are added to concrete to improve its quality and performance.

• They can affect the setting time, workability, strength, and durability of concrete.

• Examples of admixtures include water reducers, accelerators, retarders, air-entraining agents, and superplasticizers.
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Q6. What is hoop stress, How to provide reinforcement in a dome
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Hoop stress is the stress exerted circumferentially in a cylindrical or spherical object. Reinforcement in a dome can be provided by using steel bars or mesh.
• Hoop stress is caused by the pressure inside the object and is calculated using the formula P*r/t, where P is the pressure, r is the radius, and t is the thickness of the object.

• In a dome, reinforcement can be provided by using steel bars or mesh that are placed i...read more
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Q7. What is estimation and costing, No. of bricks required in 1 m3 of brickwork, various types of contracts
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Estimation and costing involves calculating the expenses of a project. No. of bricks required in 1 m3 of brickwork depends on the size of the bricks. There are various types of contracts in construction.
• Estimation and costing involves calculating the expenses of a project, including materials, labor, and other costs.

• No. of bricks required in 1 m3 of brickwork depends on the size of the bricks used. For example, if stan...read more
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120 questions in 120 minutes. 30 questions from English,30 questions from your stream,30 basic aptitude,30 current affairs type question

Q1. Tell me about 4 stroke diesel or petrol engine?
Ans. 
A 4 stroke engine is an internal combustion engine that completes 4 strokes in one cycle.
• The four strokes are intake, compression, combustion, and exhaust.

• In the intake stroke, the fuel-air mixture is drawn into the cylinder.

• In the compression stroke, the mixture is compressed to increase its temperature and pressure.

• In the combustion stroke, the mixture is ignited and the resulting explosion pushes the piston down.

• In ...read more
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Q2. What is laser beam welding?
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Laser beam welding is a process of joining two metal pieces using a laser beam.
• Laser beam welding is a non-contact process.

• It uses a high-energy laser beam to melt and fuse the metal pieces together.

• It is commonly used in the automotive, aerospace, and electronics industries.

• It produces a narrow and deep weld with minimal distortion.

• Examples include welding of car body parts, aircraft engine components, and electronic
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