Here are the top 75 Mechanical QC Questions And Answers For Aramco CBT Exam. These are the most frequently asked questions in Computer Based Testing (CBT) Exam.
Q: What is the importance of QA QC in the mechanical industry?
Ans: QA QC ensures that mechanical products and processes meet the required quality standards, ensuring safety, reliability, and customer satisfaction.
Q: What are the key responsibilities of a Mechanical QA QC engineer?
Ans: The responsibilities include inspection and testing of materials and equipment, documenting procedures, conducting audits, and ensuring compliance with quality standards.
Q: How do you prevent defects in mechanical manufacturing processes?
Ans: By implementing proper process controls, conducting regular inspections, and addressing any non-conformities promptly.
Q: What is the difference between QA and QC?
Ans: QA (Quality Assurance) focuses on preventing defects, while QC (Quality Control) deals with detecting and fixing defects.
Q: How do you determine the appropriate inspection techniques for a specific mechanical product?
Ans: The choice of inspection techniques depends on the product’s complexity, criticality, and applicable industry standards.
Q: How do you ensure that mechanical products comply with relevant industry codes and standards?
Ans: By conducting regular audits, staying updated with current codes, and actively participating in industry associations.
Q: What are Non-Destructive Testing (NDT) methods commonly used in the mechanical industry?
Ans: Common NDT methods include ultrasonic testing, magnetic particle testing, liquid penetrant testing, radiographic testing, and visual inspection.
Q: How do you handle a situation when a product does not meet the required quality standards?
Ans: Identify the root cause of the non-conformance, implement corrective actions, and prevent recurrence through process improvement.
Q: What is the importance of documentation in QA QC?
Ans: Documentation provides a traceable record of inspections, tests, and corrective actions, ensuring accountability and facilitating continuous improvement.
Q: How do you ensure the calibration of inspection equipment and measuring instruments?
Ans: Regularly calibrate the equipment according to established standards and maintain proper records.
Q: What is the process for conducting a material inspection?
Ans: The process includes verifying material certifications, checking for physical defects, dimensions, and conducting appropriate tests.
Q: How do you ensure that welding processes meet quality requirements?
Ans: By verifying the qualifications of welders, inspecting weld joints, and performing destructive and non-destructive tests as per the applicable standards.
Q: How do you manage quality control in a fast-paced manufacturing environment?
Ans: By implementing efficient inspection procedures, having a skilled QA QC team, and integrating quality checks into the production process.
Q: What is the role of statistical process control (SPC) in QA QC?
Ans: SPC helps monitor and control the variation in manufacturing processes, ensuring they remain within acceptable limits.
Q: How do you handle discrepancies in measuring results between different instruments?
Ans: Investigate the reasons for the discrepancies, recalibrate the instruments if necessary, and resolve any uncertainties.
Q: What is the purpose of conducting supplier audits?
Ans: Supplier audits ensure that suppliers meet the required quality standards, helping to maintain consistency in the supply chain.
Q: Explain the concept of “First Article Inspection” (FAI) and its significance.
Ans: FAI involves inspecting the first manufactured item to verify that it meets all design requirements before proceeding with mass production.
Q: How do you handle quality control when implementing new manufacturing processes?
Ans: By conducting pilot runs, analyzing results, making necessary adjustments, and continually monitoring performance during the implementation phase.
Q: What steps do you take to ensure compliance with health and safety regulations in QA QC activities?
Ans: Implement safety protocols, provide appropriate personal protective equipment (PPE), and conduct regular safety training for the team.
Q: Describe a situation where your QA QC skills helped improve a mechanical process or product.
Ans: Provide a specific example of how your expertise led to identifying and rectifying a quality issue, resulting in improved efficiency or performance.
Q: How do you ensure that the final product meets customer expectations and specifications?
Ans: By regularly communicating with customers, conducting inspections, and ensuring that all specified requirements are met during production.
Q: What are the key elements of a quality control plan for a mechanical project?
Ans: A quality control plan should include clear inspection criteria, testing procedures, responsibilities of team members, and documentation requirements.
Q: How do you stay updated with the latest advancements and best practices in QA QC for the mechanical industry?
Ans: Attend workshops, seminars, and industry conferences, and actively engage with professional networks and publications.
Q: Describe your approach to managing multiple projects with different quality requirements simultaneously.
Ans: Prioritize tasks based on criticality, allocate resources effectively, and ensure that each project adheres to its specific quality plan.
Q: What do you think is the biggest challenge in maintaining quality in mechanical engineering, and how do you address it?
Ans: Highlight a significant challenge and discuss how you apply your expertise and problem-solving skills to overcome it, emphasizing the importance of continuous improvement.
Q: What is NACE MR0175?
Ans. National Association of Corrosion Engineers NACE MR0175: Standard Material Requirement-Sulfide stress cracking resistant metallic material for oilfield equipment.
Q: What is the meaning of CSD?
Ans. Consulting Services Department
Q: What is RTR?
Ans. Reinforce Thermosetting Resin
Q: What is AWWA?
Ans. American Water Works Association AWS.
Q: D1.1 structural, don’t need to qualify for WPS? (True or false)
Ans. False
Q: What is the vision of an inspector?
Ans. Jaeger 1
Q: What electrode is used for the overhead position?
Ans. 6010
Q: Can the 6010 electrode be used in the vertical position over the 7018?
Ans. No
Q: Stud welding is based on AWS D1.1? (True or false)
Ans. True
How can lack of fusion be detected?
Ans. Ultrasonic Test (UT)
Which one will be a shielding?
Ans. Flux
What is the purpose of shielding?
Ans. To prevent atmospheric contamination during welding
What is the Carbon Equivalent? Why is it important?
Ans. To determine the material capabilities
How to measure the raised faced finish?
Ans. Surface comparator gauge
What is thermal expansion?
Ans. The increase of material due to an increase in temperature
PWHT is required to apply on 1″ thickness? (True or false)
Ans. True
In the overhead position, what kind of electrode is acceptable?
Ans. 6010
What other American code is required for testing pipeline and welder qualification?
Ans. ASME IX (Welding & Brazing Qualification)
Is the hardness test used to determine tensile strength?
Ans. No
Is preheat needed in tack welding in thick materials?
Ans. Yes
What are the types of joints?
Ans. Butt, lap, tee, corner, edge
Which is harder, steel containing 0.1% or 0.5% carbon? Ans. 0.5% carbon
What grooves are used for the SAW process? When to use these preparations (grooves)?
Ans. U, V & Square grooves
What is GMAW mode of transfer?
Ans. Globular, spray, pulse, short-circuiting
What are the types of RTR joints?
Ans. Bell & spigot, socket, flange joint
What basic instrument is used to measure preheat temperature?
Ans. Temperature indicating crayon (Tempil stick), contact pyrometer
Is the circumferential seam welded first, then the longitudinal seam? (True or false)
Ans. False
Is the 6010 electrode designed to apply to the 7018 electrode in the vertical position? (True or false)
Ans. False
How to repair too close root gap?
Ans. By means of grinding
What will you do if you find a welder doing something wrong?
Ans. Ask the welding foreman
What American standard is used for structural welding?
Ans. AWS D1.1
Why does 316L have low carbon content in stainless steel?
Ans. L- is to represent low carbon content
What is a good attitude of an inspector?
Ans. Quality-minded, knowledgeable, experienced, impartial, informed, etc.
What are the types of joint categories?
Ans. Category A, B, C, D based on UW 3, table UW 13
What is the minimum tensile strength of a 7018 electrode?
Ans. 70,000 psi
What is the tensile strength of a Grade 8.8 bolt?
Ans. 800 MPa
What is the hardness range for carbon steel material?
Ans. 150-200 HB (Brinell hardness)
What is the maximum allowable carbon content for low carbon stainless steel (L-grade)?
Ans. 0.03%
What is the minimum temperature for post-weld heat treatment (PWHT) of carbon steel?
Ans. 600°C
What is the diameter of a schedule 40 pipe with a nominal size of 8 inches?
Ans. 219.1 mm
What is the yield strength of ASTM A36 steel?
Ans. 250 MPa
What is the maximum allowable hardness for HAZ (Heat Affected Zone) in carbon steel welding?
Ans. 350 HV
What is the minimum preheat temperature required for welding carbon steel with a thickness of 25 mm?
Ans. 100°C
What is the recommended interpass temperature for welding alloy steel?
Ans. 150°C
What is the required minimum impact energy for a Charpy V-notch test at -20°C for structural steel?
Ans. 27 J
What is the minimum holding time in hours for a dye penetrant test (DPT) to detect surface defects effectively?
Ans. 1 hour
What is the recommended inspection interval for pressure vessels as per API 510?
Ans. Every 5 years
What is the minimum temperature required for a ferritic stainless steel material to avoid embrittlement during welding?
Ans. 300°C
What is the recommended thickness range for the magnetic particle test (MT) using the yoke method?
Ans. 2-50 mm
What is the minimum number of hardness indentations required in a weld joint as per ASME IX?
Ans. 3 indentations
What is the maximum allowable surface roughness (Ra) for welds in a food-grade stainless steel vessel?
Ans. 0.8 µm
What is the minimum temperature for conducting a hardness test on carbon steel after PWHT?
Ans. 100°C
What is the recommended holding time in minutes for the temperature indicating crayon (Tempil stick) to indicate preheat temperature?
Ans. 3 minutes
What is the maximum allowable surface contamination level for a test surface before conducting a dye penetrant test (DPT)?
Ans. Level 2 (as per ISO 3452-2)
What is the minimum temperature for conducting a spark test to identify stainless steel material?
Ans. 10°C
What is the purpose of NACE MR0175 standard?
Ans. To ensure sulfide stress cracking resistant metallic materials for oilfield equipment.
What is the formula for calculating carbon equivalent (CE) in welding?
Ans. CE = %C + (%Mn/6) + (%Cr + %Mo + %V)/5 + (%Ni + %Cu)/15
What is the maximum allowable carbon equivalent (CE) for welding carbon steel materials as per NACE MR0175?
Ans. 0.43
What is the minimum required impact energy for a Charpy V-notch test at -50°C for offshore structures?
Ans. 42 J
What is the purpose of a bell and spigot joint in RTR (Reinforced Thermosetting Resin) pipes?
Ans. The bell and spigot joint allows for easy and efficient installation of RTR pipes, ensuring a tight and leak-free connection.
What is the minimum temperature for conducting a liquid penetrant test (PT) on carbon steel?
Ans. 10°C
What is the minimum tensile strength requirement for P1 material as per ASME BPVC Section II Part D?
Ans. 60,000 psi
What is the recommended thickness range for conducting an ultrasonic thickness test (UTT) on a steel plate?
Ans. 6 mm – 100 mm
What is the maximum allowable surface roughness (Rz) for welds in pressure vessels?
Ans. 100 µm
What is the minimum holding time in minutes for the temperature indicating crayon (Tempilstik) to indicate interpass temperature?
Ans. 5 minutes
What is the purpose of a chamfer in welding?
Ans. To provide a smooth transition for the weld metal and to reduce the risk of lack of fusion defects.
What is the minimum required hardness value for HAZ (Heat Affected Zone) in low alloy steel welding as per NACE MR0175?
Ans. 200 HV
What is the recommended holding time in minutes for a dye penetrant test (DPT) on austenitic stainless steel materials?
Ans. 30 minutes
What is the maximum allowable hardness for carbon steel welds in the as-welded condition as per AWS D1.1?
Ans. 350 HV
What is the minimum temperature for conducting a magnetic particle test (MT) on carbon steel?
Ans. 5°C
What is the purpose of a root gap in butt joint welding?
Ans. To allow proper penetration and fusion of the root pass.
What is the minimum temperature for conducting a wet fluorescent magnetic particle test (MT) on non-ferromagnetic materials?
Ans. 10°C
What is the maximum allowable hardness for stainless steel welds in the as-welded condition as per AWS D1.6?
Ans. 350 HV
What is the minimum holding time in hours for a liquid penetrant test (PT) to detect surface defects effectively?
Ans. 2 hours
What is the maximum allowable surface contamination level for a test surface before conducting a magnetic particle test (MT)?
Ans. Level 2 (as per ISO 3452-2)