Kellogg Brown and Root Mechanical Engineer Interview Questions and Answers

Q1. Describe your most recent Projects.
Ans. 
Designed and implemented a new cooling system for a manufacturing plant.
• Researched different cooling technologies and their efficiency

• Collaborated with a team of engineers to design the system layout

• Performed simulations to optimize the cooling system performance

• Managed the installation and testing of the new system
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Q2. Explain Design Methodology
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Design methodology is a systematic approach to solving engineering problems by following a series of steps.
• Design methodology involves defining the problem, researching, brainstorming solutions, selecting the best solution, prototyping, testing, and refining.

• It helps ensure that the final product meets the desired requirements and functions effectively.

• Examples of design methodologies include Six Sigma, Lean Manufactur
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Q3. Explain 3,2,1 principle of GD &t
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The 3,2,1 principle of GD&T is a method used to establish a datum reference frame for geometric dimensioning and tolerancing.
• 3 points are used to establish a datum plane, 2 points to establish a datum line, and 1 point to establish a datum point.

• The 3,2,1 principle ensures that the part is securely located and oriented in a consistent manner for measurement and manufacturing processes.

• Datum features are used as referen...read more
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Displacement velocity and acceleration diagram when the followers moves with simple harmonic motion

Q1. What is surface
Ans. 
Surface refers to the outermost layer or boundary of an object or material.
• Surface is the area that is exposed to the surrounding environment.

• It can be smooth, rough, porous, reflective, or absorbent.

• Examples include the surface of a table, the skin's surface, or the surface of a lake.
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Q2. What is hardness
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Hardness is a measure of a material's resistance to deformation, scratching, or abrasion.
• Hardness is a physical property of materials.

• It is typically measured using tests like the Mohs scale for minerals or the Rockwell scale for metals.

• Materials with higher hardness values are more resistant to wear and scratching.

• Hardness can be influenced by factors such as composition, microstructure, and processing.

• Examples of har...read more
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Q1. What are the materials used in Aero-Engines
Ans. 
Materials used in Aero-Engines include titanium, nickel-based superalloys, and composites.
• Titanium is used for components like compressor blades and discs due to its high strength-to-weight ratio.

• Nickel-based superalloys are used for high temperature components like turbine blades.

• Composites, such as carbon fiber reinforced polymers, are used for fan blades and other parts to reduce weight and improve fuel efficiency.
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Q2. Difference Concentricity and Run Out
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Concentricity is the condition where two or more features share a common center point, while run out is the amount of deviation from true circularity of an object.
• Concentricity refers to the tolerance of the center point of a feature relative to another feature or axis.

• Run out is the measurement of how much a part deviates from a true circular path when rotated around an axis.

• Concentricity is important for ensuring pro...read more
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Q1. Affinity laws for pump
Ans. 
Affinity laws describe the relationship between pump performance and speed, flow rate, and head.
• Affinity laws state that if the speed of a pump is changed, the flow rate and head will also change proportionally.

• The laws can be used to predict the performance of a pump at different speeds without having to conduct actual tests.

• The three affinity laws are: 1) Flow rate is proportional to speed, 2) Head is proportional to...read more
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Q2. How to calculate NPSH
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NPSH is calculated by subtracting the vapor pressure of the fluid from the absolute pressure at the pump suction.
• NPSH stands for Net Positive Suction Head.

• It is a measure of the pressure required at the suction of a pump to avoid cavitation.

• NPSH is calculated by subtracting the vapor pressure of the fluid from the absolute pressure at the pump suction.

• NPSH is important to ensure the pump operates efficiently and does n...read more
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Q3. How to calculate total head required for a pump
Ans. 
Total head required for a pump can be calculated using Bernoulli's equation
• Determine the flow rate required

• Calculate the friction loss in the piping system

• Determine the elevation difference between the pump and the discharge point

• Add the three values to get the total head required

• Consider any additional losses due to fittings or valves
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Q4. Standard oxygen transfer efficiency for fine bubble diffusers
Ans. 
Standard oxygen transfer efficiency for fine bubble diffusers is typically around 30-40%.
• Fine bubble diffusers are commonly used in wastewater treatment plants to transfer oxygen to the water.

• Factors that can affect oxygen transfer efficiency include bubble size, diffuser design, and water temperature.

• Efficiency can be improved by optimizing these factors and ensuring proper maintenance of the diffusers.

• Typical oxygen ...read more
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Q5. Pipe material for 48% NaOH
Ans. 
The recommended pipe material for 48% NaOH is high-density polyethylene (HDPE) or polyvinyl chloride (PVC).
• 48% NaOH is a highly corrosive substance that can cause damage to certain pipe materials.

• HDPE and PVC are resistant to the corrosive effects of NaOH and are commonly used for transporting this chemical.

• Other materials such as steel or copper should be avoided due to their susceptibility to corrosion.

• The temperatur...read more
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Q6. How to design a wet well pumping station
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Designing a wet well pumping station involves several steps and considerations.
• Determine the flow rate and head requirements

• Select appropriate pumps and piping

• Design the wet well and sump

• Include safety features such as alarms and backup power

• Consider maintenance and accessibility

• Ensure compliance with regulations and standards
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Q7. Accessories used in a pump suction and discharge line
Ans. 
Accessories used in a pump suction and discharge line
• Strainers or filters to prevent debris from entering the pump

• Valves to control the flow of fluid

• Pressure gauges to monitor the pressure

• Flanges to connect the pump to the piping system

• Flexible connectors to absorb vibrations

• Check valves to prevent backflow

• Expansion joints to compensate for thermal expansion

• Flow meters to measure the flow rate
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Q8. Which pipe material is good for NaCl 2500 ppm fluid and why?
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Duplex stainless steel is good for NaCl 2500 ppm fluid due to its high corrosion resistance and strength.
• Duplex stainless steel has a high resistance to corrosion and pitting

• It has a high strength and toughness

• Other materials like carbon steel and copper alloys may corrode in NaCl solutions
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Q9. Gradient required for free flow in a sewage pipe
Ans. 
The gradient required for free flow in a sewage pipe depends on the pipe diameter, flow rate, and type of material used.
• The gradient should be steep enough to ensure that the sewage flows freely without any blockages or backups.

• The gradient is typically expressed as a percentage or ratio of the vertical drop to the horizontal distance.

• For example, a gradient of 1:100 means that for every 100 meters of horizontal distan...read more
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Q1. What is auto mobile? Ans Auto mobile is self profil vehicle which dails good around the passenger with Ono please to another please.
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Q2. Types of fit? Ans-According to ISI system fit are deivde in two three parts provide 1 clearance fit. 2 Interference fit 3 transition fit.
Ans. 
Types of fits include clearance fit, interference fit, and transition fit.
• Clearance fit: parts are intended to have a gap between them

• Interference fit: parts are intended to be pressed or forced together

• Transition fit: parts have a combination of clearance and interference fit

• ISI system divides fits into these three categories

• Fits are important in ensuring proper functioning of mechanical systems
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Q3. What is tollerance? Ans-The permissable very action of a size is called tollerance.
Ans. 
Tolerance is the allowable variation in a dimension or measurement.
• Tolerance is important in engineering to ensure that parts fit together properly and function as intended.

• It is usually expressed as a range of acceptable values, such as +/- 0.1mm.

• Tolerance can be affected by factors such as manufacturing processes, materials, and design requirements.

• Tolerance can also be used to control the fit and clearance between m...read more
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Q4. What is fits? Ans-The relationship between two matting parts is known as fit.
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Q5. Types of sefety? Ans-Safety are three types 1 personal safety 2 General safety 3 Machine sefety.
Ans. 
There are three types of safety: personal safety, general safety, and machine safety.
• Personal safety involves protecting oneself from harm or injury.

• General safety pertains to the safety of the environment and people around us.

• Machine safety involves ensuring that machines are safe to operate and do not pose a threat to workers.

• Examples of personal safety measures include wearing protective gear, such as helmets and gl...read more
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Q1. Pattern features in creo
Ans. 
Pattern features in Creo allow for creating repetitive geometry in a design.
• Pattern features can be linear, circular, or mirror patterns.

• Linear patterns create copies of a feature along a straight path.

• Circular patterns create copies of a feature around a center point.

• Mirror patterns create copies of a feature mirrored across a plane.

• Pattern features help save time and maintain design consistency.
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Q2. Family table in creo
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Family table in Creo allows for creating multiple variations of a part or assembly within a single file.
• Family table is a feature in Creo Parametric that allows for creating multiple instances of a part or assembly with different dimensions or parameters.

• It helps in managing different configurations of a design within a single file, reducing the need for multiple files for variations.

• Users can define different values f...read more
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Q1. About yourself and your experience
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Q2. Your experience and knowledge
Ans. 
I have 5 years of experience in mechanical engineering with a focus on designing and testing automotive components.
• Designed and tested various automotive components such as suspension systems, engine parts, and cooling systems

• Utilized CAD software to create detailed designs and simulations

• Worked closely with manufacturing teams to ensure designs were feasible and cost-effective

• Performed stress and thermal analysis on c...read more
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