ChemChina Interview Questions and Answers

Basic Aptitude Questions Reasoning & Verbal Ability

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Q1. What are the tensile forces acts on material
Ans. 
Tensile forces are forces that stretch or pull materials apart.
• Tensile forces act in the opposite direction of compressive forces

• Examples of tensile forces include stretching a rubber band or pulling on a rope

• Tensile strength is a measure of a material's ability to withstand tensile forces
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Q2. Write all formulas you know of Fluid Mechanics
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Formulas in Fluid Mechanics
• Bernoulli's equation: P + 0.5ρv^2 + ρgh = constant

• Continuity equation: A1v1 = A2v2

• Navier-Stokes equation: ρ(∂v/∂t + v∇v) = -∇P + μ∇^2v + ρg

• Ideal gas law: PV = nRT

• Poiseuille's Law: Q = πr^4(ΔP)/(8ηL)
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Q3. Laws of thermodynamics
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The fundamental laws of thermodynamics govern the behavior of energy in systems.
• First Law of Thermodynamics: Energy cannot be created or destroyed, only transferred or converted.

• Second Law of Thermodynamics: The entropy of an isolated system will always increase over time.

• Third Law of Thermodynamics: As temperature approaches absolute zero, the entropy of a system approaches a minimum value.

• Examples: A car engine conve...read more
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Q4. What is Fouriers Law write its equation
Ans. 
Fourier's Law describes the flow of heat through a material.
• Fourier's Law states that the rate of heat transfer through a material is directly proportional to the negative gradient of temperature and the area perpendicular to the direction of heat flow.

• The equation for Fourier's Law is q = -k * A * (dT/dx), where q is the heat transfer rate, k is the thermal conductivity of the material, A is the cross-sectional area, ...read more
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Q5. Explain Iron Carbon phase diagram
Ans. 
The Iron-Carbon phase diagram illustrates the phases and microstructures of iron-carbon alloys as a function of temperature and composition.
• Shows the phases of iron and carbon at different temperatures and compositions

• Includes regions for austenite, ferrite, cementite, and pearlite

• Critical points such as eutectic point and eutectoid point are marked

• Used to predict the microstructure of steel based on composition and he
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Q6. Stress Strain Curve Explain
Ans. 
The stress-strain curve shows the relationship between stress (force applied) and strain (resulting deformation) in a material.
• The curve typically consists of three main regions: elastic deformation, plastic deformation, and fracture.

• In the elastic region, the material deforms elastically and returns to its original shape when the stress is removed.

• The plastic region is where permanent deformation occurs, but the mater...read more
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Q7. Calculate SFD & BMD
Ans. 
SFD and BMD are calculated using equations of equilibrium and relationships between load, shear force, and bending moment.
• Calculate reactions at supports using equations of equilibrium

• Determine the shear force at different points along the beam by considering the applied loads and reactions

• Calculate the bending moment at different points by integrating the shear force diagram

• Plot the SFD and BMD based on the calculated...read more
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Q8. How to Calculate velocity of fluid flowing through pipe
Ans. 
Velocity of fluid flowing through a pipe can be calculated using the formula Q = A * V, where Q is the flow rate, A is the cross-sectional area of the pipe, and V is the velocity of the fluid.
• Calculate the cross-sectional area of the pipe using the formula A = π * r^2, where r is the radius of the pipe.

• Determine the flow rate (Q) of the fluid, which is typically measured in cubic meters per second (m^3/s) or liters per...read more
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Q9. What is Difference between entropy and enthalpy
Ans. 
Entropy is a measure of disorder or randomness in a system, while enthalpy is a measure of the heat energy in a system.
• Entropy is a thermodynamic property that measures the amount of energy in a system that is not available to do work.

• Enthalpy is a thermodynamic property that measures the total heat content of a system.

• Entropy increases in irreversible processes, while enthalpy remains constant.

• Entropy is denoted by S,...read more
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Q10. Draw Refrigeration Cycle Graph
Ans. 
The Refrigeration Cycle graph shows the process of cooling a space by transferring heat from inside to outside.
• The cycle starts with the refrigerant entering the compressor as a low-pressure gas.

• The refrigerant is compressed, raising its temperature and pressure, before entering the condenser where it releases heat to the surroundings.

• After losing heat, the refrigerant becomes a high-pressure liquid and flows into the ...read more
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Q11. Draw vapour absorption cycle graph
Ans. 
The vapor absorption cycle graph shows the relationship between pressure, temperature, and enthalpy during the process.
• The graph typically shows pressure on the y-axis and temperature on the x-axis.

• It includes lines representing the various stages of the cycle such as evaporation, absorption, and desorption.

• The enthalpy values at different points in the cycle can also be plotted on the graph.

• Example: The graph will sho...read more
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Q12. Draw Rankine otto & diesel cycle graph
Ans. 
The Rankine, Otto, and Diesel cycle graphs are commonly used in thermodynamics to analyze different types of heat engines.
• The Rankine cycle is used in steam power plants and consists of four processes: heat addition, isentropic expansion, heat rejection, and isentropic compression.

• The Otto cycle is used in spark-ignition engines and consists of four processes: isentropic compression, constant volume heat addition, isen...read more
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Q1. My Experience is good and best Experience this this my problem is company dropuot , My interview this HR.and CEO. BM .and Accounted this all company best Experience members this me interview show That is ...read more
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Q2. Company manufacturing work this BHEL part and CGL part working this manufacturing company
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Q3. What is skill? Ans:- MS word ms excel and telly knowledge all store keepers knowledge
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Q4. What this professional and personal? Ans:-I am work times professional and that is work out time personal
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Q5. What did you house? Working side areas areng
Ans. 
I managed inventory of various items in the store, including working side areas.
• Managed inventory of products and supplies

• Organized and maintained stock levels

• Handled incoming and outgoing shipments

• Ensured proper storage and labeling of items

• Performed regular inventory checks and audits
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Q1. Introduce yourself
Ans. 
I am a recent graduate with a degree in Business Administration and a passion for marketing and project management.
• Recent graduate with a degree in Business Administration

• Passionate about marketing and project management

• Strong communication and organizational skills

• Experience in internships and extracurricular activities
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Q2. What is material use in road construction
Ans. 
Materials used in road construction include asphalt, concrete, gravel, and crushed stone.
• Asphalt is a common material used for road surfaces due to its durability and flexibility.

• Concrete is often used for highways and major roads because of its strength and longevity.

• Gravel is used for rural roads and driveways as a cost-effective option.

• Crushed stone is used as a base layer for roads to provide stability and drainage...read more
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Q3. What is strength requiredfor constructionof bridge
Ans. 
Strength required for construction of a bridge includes structural stability, load-bearing capacity, and durability.
• Structural stability to withstand various forces such as wind, traffic, and seismic activity

• Load-bearing capacity to support the weight of vehicles, pedestrians, and other loads

• Durability to resist corrosion, weathering, and wear over time

• Materials like steel, concrete, and composite materials are commonl
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Q4. What is general instructionsof building construction
Ans. 
General instructions for building construction involve following safety regulations, using proper materials, and ensuring structural integrity.
• Ensure compliance with building codes and regulations

• Use quality materials to ensure durability and longevity

• Follow proper construction techniques to ensure structural integrity

• Ensure proper foundation and support for the building

• Consider environmental factors and sustainability...read more
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Q5. What is height tallest
Ans. 
The tallest height is the highest point above a given level or surface.
• Height is a measurement of how tall something is

• The tallest height on Earth is the summit of Mount Everest at 29,032 feet

• Height can also refer to the highest point reached by something like a rocket or airplane
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Q1. More on Technical area
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Q1. More on Technical area
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Q1. Technical + Behaviour
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Q1. Technical + Behaviour
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Q1. Expectation and Genaral
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Simple aptitude questions

This is a shortlisting round, and many technically knowledgeable individuals did not qualify for this stage.

Q1. Which flow system is more effective: countercurrent flow or concurrent flow, and what are the reasons for this?
Ans. 
Countercurrent flow is more effective due to increased concentration gradient and better utilization of resources.
• Countercurrent flow allows for a greater concentration gradient between the two fluids, leading to more efficient mass transfer.

• Countercurrent flow also allows for better utilization of resources as the fluids are in contact for a longer period of time.

• Concurrent flow, on the other hand, results in a lower ...read more
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Q2. What is the procedure for designing a heat exchanger?
Ans. 
The procedure for designing a heat exchanger involves determining heat transfer requirements, selecting appropriate materials, designing the geometry, and analyzing performance.
• Determine the heat transfer requirements based on the fluids involved, flow rates, temperatures, and desired heat transfer rate.

• Select appropriate materials for the heat exchanger based on compatibility with the fluids, operating conditions, and...read more
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Regarding RDSS Projects

Q1. Regarding BOQ of 11 KV & 33 KV Feeder Bifurcation
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Q2. Regarding Installation of DTR Structure with transformer
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Q3. Regarding 33/11 KV Augmented substation and installation of Power Transformer
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This test was related to Aptitude as per AMCAT syllabus involves Aptitude, English, Personality, Core branch questions

Q1. Explain Transformer circuit diagram, losses
Ans. 
Transformer circuit diagram consists of primary and secondary coils connected by a magnetic core. Losses include core losses and copper losses.
• Transformer circuit diagram includes primary and secondary coils connected by a magnetic core

• Losses in a transformer include core losses (eddy current and hysteresis losses) and copper losses (due to resistance in windings)

• Efficiency of a transformer is affected by these losses
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Q2. Compare losses of transformer with Induction motor
Ans. 
Transformers have lower losses compared to induction motors due to their simpler design and operation.
• Transformers have core losses (eddy current and hysteresis losses) and copper losses (due to resistance in windings).

• Induction motors have similar losses but also include mechanical losses (friction and windage losses).

• Efficiency of transformers is typically higher than induction motors due to lower losses.

• Losses in tr...read more
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Q1. Introduce yourself
Ans. 
I am a recent graduate with a degree in engineering, passionate about problem-solving and eager to learn and grow in the field.
• Recent graduate with a degree in engineering

• Passionate about problem-solving

• Eager to learn and grow in the field
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Q2. What you know about company?
Ans. 
Company is a leading engineering firm specializing in renewable energy projects.
• Company focuses on renewable energy projects

• Known for innovative engineering solutions

• Has a strong track record of successful projects

• Offers opportunities for growth and development

• Has a diverse and talented team of engineers
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