Johnson Matthey Quality Control Chemist Officer Interview Questions and Answers for Experienced

Q1. You should be aware of the process SPC, MSA, POKE YOKE, KAIZEN,
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Q1. Gernal introduction must prepared
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Q1. What is micrometre
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A micrometre is a unit of length equal to one millionth of a meter, commonly used in precision engineering and measurement.
• A micrometre is also known as a micron.

• It is commonly used in fields such as engineering, physics, and biology for precise measurements.

• One micrometre is equal to 0.001 millimeters or 0.000001 meters.

• Micrometres are often used to measure the thickness of materials, the size of cells, and the wavele
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Q2. What is hight gauge
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A height gauge is a precision measurement tool used to measure the height of objects with high accuracy.
• Height gauges typically consist of a base, a vertical column, a measuring scale, and a scriber or probe.

• They are commonly used in manufacturing and engineering for quality control purposes.

• Height gauges can be manual or digital, with digital versions offering higher precision and ease of use.

• Examples of height gauges...read more
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Q3. What is CNC machine
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CNC machine stands for Computer Numerical Control machine, which is a computer-controlled machine tool used for cutting and shaping materials.
• CNC machines are used in manufacturing to automate processes such as cutting, drilling, milling, and more.

• They operate based on pre-programmed computer software that controls the movement of the machine's tools.

• Examples of CNC machines include CNC routers, CNC mills, CNC lathes,
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Q1. What is Quality ?
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Quality is the measure of excellence or superiority of a product or service.
• Quality is meeting or exceeding customer expectations.

• It involves consistency, reliability, and conformance to requirements.

• Quality is achieved through continuous improvement and prevention of defects.

• Examples include high durability of a product, low defect rate in manufacturing, and excellent customer service.
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Q2. What is casting and its defects ?
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Casting is a manufacturing process in which a liquid material is poured into a mold and allowed to solidify into the desired shape. Casting defects are imperfections that occur during this process.
• Casting involves pouring molten metal, plastic, or other materials into a mold to create a specific shape.

• Common casting defects include porosity, shrinkage, cold shuts, misruns, and inclusions.

• Porosity is the presence of air...read more
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Q3. What is manufacturing ?
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Manufacturing is the process of producing goods through the use of labor, machines, tools, and chemical or biological processing.
• Manufacturing involves transforming raw materials into finished products

• It includes processes such as cutting, shaping, assembling, and packaging

• Examples include automobile manufacturing, electronics production, and food processing
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Q1. What is tolerence
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Tolerance is the acceptable range of variation in a measurement or dimension.
• Tolerance is the maximum and minimum limits within which a product or process must operate to meet specifications.

• It ensures that parts fit together properly and function correctly.

• Examples include the tolerance on the diameter of a shaft or the thickness of a sheet of metal.
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Q2. Types of Tolerance
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Types of tolerance include bilateral, unilateral, and geometric.
• Bilateral tolerance: allows for variation in both directions from the nominal dimension

• Unilateral tolerance: allows for variation in only one direction from the nominal dimension

• Geometric tolerance: specifies the allowable variation in form, profile, orientation, or location of a feature
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Q3. How many types of casting are there
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There are two main types of casting: expendable mold casting and permanent mold casting.
• Expendable mold casting includes sand casting, investment casting, and plaster mold casting.

• Permanent mold casting includes die casting and centrifugal casting.
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Q1. Verify ur documents
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Q2. About ur self
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Questions related to previous company experiences.

Basic logical question

Reasoning ability question

Q1. Machining questions related to GD&T
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Q2. What is positioning tolerance
Ans. 
Positioning tolerance refers to the allowable deviation from the desired position of an object or component.
• Positioning tolerance is a measure of how much an object or component can deviate from its intended position without affecting its functionality.

• It is typically specified in terms of a maximum allowable distance or angle.

• For example, in manufacturing, positioning tolerance is used to ensure that parts fit togethe...read more
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Q1. 1) What are the measuring instrument used and there least counts. 2) knowledge of GD & T
Ans. 
Measuring instruments used in quality inspection and their least counts.
• Common measuring instruments include calipers, micrometers, height gauges, and dial indicators.

• Calipers are used to measure dimensions and have a least count of 0.02 mm.

• Micrometers are used for precise measurements and have a least count of 0.01 mm.

• Height gauges are used to measure heights and have a least count of 0.02 mm.

• Dial indicators are used ...read more
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