Eternis Fine Chemicals QC Officer Interview Questions and Answers

This is chemistry based test for the QC Chemist and their questions moderate level.

Q1. What is resolution?
Ans. 
Resolution refers to the ability of a system to distinguish between two closely spaced objects or points.
• Resolution is a measure of the clarity or sharpness of an image produced by a camera or display.

• It is often expressed in terms of pixels for digital images or lines per millimeter for optical devices.

• Higher resolution results in more detailed and clearer images.

• For example, a camera with a resolution of 12 megapixel...read more
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Q2. What type of standard used in AAS?
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The standard used in AAS is the atomic absorption standard.
• Atomic absorption standard is used to calibrate and validate the accuracy of AAS instruments.

• It helps in determining the concentration of elements in a sample by measuring the absorption of light at specific wavelengths.

• Common examples of atomic absorption standards include solutions of known concentrations of elements like copper, lead, and zinc.
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Q3. What is the principal of HPLC?
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HPLC stands for High Performance Liquid Chromatography, a technique used to separate, identify, and quantify components in a mixture.
• HPLC involves a stationary phase (usually a column packed with particles) and a mobile phase (liquid solvent).

• The sample mixture is injected into the HPLC system and carried by the mobile phase through the column.

• Different components in the sample interact differently with the stationary ...read more
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Q1. Family background?
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Q2. Why we are hiring to you?
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Q1. Type of reactor
Ans. 
There are various types of reactors used in production processes, such as batch reactors, continuous stirred-tank reactors, and plug flow reactors.
• Batch reactors are used for small-scale production and allow for easy control of reaction conditions.

• Continuous stirred-tank reactors are used for continuous production and have good mixing capabilities.

• Plug flow reactors are used for reactions that require a specific reside...read more
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Q2. Types of distillation column
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Types of distillation columns include batch, continuous, fractional, and steam distillation.
• Batch distillation: Used for small-scale production and involves separating components based on boiling points.

• Continuous distillation: Used for large-scale production and involves a continuous feed of mixture and product removal.

• Fractional distillation: Used to separate components with closer boiling points by creating multiple...read more
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Q1. What are difference between flash point and fire point???
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Flash point is the temperature at which a substance gives off enough vapor to ignite momentarily, while fire point is the temperature at which a substance will continue to burn after ignition.
• Flash point is the temperature at which a substance can ignite momentarily when exposed to an ignition source.

• Fire point is the temperature at which a substance will continue to burn after ignition.

• Flash point is typically lower t...read more
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Q2. What is centrifugal pump mechanism???
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Centrifugal pump mechanism involves the conversion of mechanical energy into kinetic energy to increase the fluid's velocity and pressure.
• Centrifugal pump consists of an impeller that rotates to create centrifugal force.

• Fluid enters the pump through the center of the impeller and is flung outwards by centrifugal force.

• The fluid gains kinetic energy and pressure as it moves through the pump.

• The fluid is then discharged ...read more
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Q1. As per experience and Study related all Questions.
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Q2. Nothing else all regular basis of questions.
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Q1. How to create vacuum in column
Ans. 
Vacuum in a column can be created by using a vacuum pump to remove air and other gases from the column.
• Use a vacuum pump to remove air and other gases from the column

• Ensure all connections are airtight to maintain the vacuum

• Monitor the vacuum level regularly to ensure it is maintained

• Adjust the vacuum pump settings as needed to achieve the desired vacuum level
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Q2. How steam ejector work
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Steam ejectors work by using high-pressure steam to create a vacuum for removing gases or vapors from a system.
• Steam is expanded through a nozzle to increase its velocity

• The high-velocity steam entrains the gases or vapors to be removed

• The mixture of steam and gases is then condensed and separated in a diffuser

• The condensed steam is usually discharged to a condenser or a drain
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Q1. What is lel & uel of hydrogen?
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LEL (Lower Explosive Limit) and UEL (Upper Explosive Limit) are the concentration range of a gas in air that can result in an explosion if ignited.
• LEL of hydrogen is 4% in air

• UEL of hydrogen is 75% in air

• Concentrations below LEL are too lean to burn, while concentrations above UEL are too rich to burn
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