Vishnu Chemicals Assistant Manager Operations Interview Questions and Answers

General ability test maths reasonings

Q1. Core chemical engg test
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Q2. Pump cavitation reason how u can sloved that problem. Distillation plate design method
Ans. 
Pump cavitation can be caused by low pressure or high temperature. It can be solved by increasing pressure or reducing temperature.
• Pump cavitation occurs when the pressure in the pump drops below the vapor pressure of the liquid being pumped.

• This can be caused by low pressure or high temperature.

• To solve the problem, you can increase the pressure or reduce the temperature.

• Other solutions include increasing the size of ...read more
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Q3. Steam ejector working as pressure sensitivity
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Steam ejector works based on pressure sensitivity.
• Steam ejector uses high-pressure steam to create a vacuum by entraining and compressing low-pressure gas or vapor.

• The pressure difference between the high-pressure steam and low-pressure gas or vapor causes the gas or vapor to be drawn into the ejector.

• The steam ejector is commonly used in refrigeration, distillation, and vacuum systems.

• The efficiency of the steam eject...read more
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Very easy question but time is not more.

1st Introduction.
2nd Project
3rd Favourite Subject
4th Technical Questions
5th General knowledge
6th Hr round

I am selected in 1st round ,so 2nd time Interview for Technical + Hr

Good performance & technical answer

Q1. What is Pump Whay required pump
Ans. 
Pump Whay is a required pump for a specific application.
• Pump Whay is likely a typo and should be corrected to 'Pump What'.

• The required pump depends on the specific application and its requirements.

• Examples of pump types include centrifugal pumps, diaphragm pumps, and gear pumps.
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Q2. What is sop & standard ruals
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SOP stands for Standard Operating Procedure, which are established procedures to ensure consistency and quality in operations. Standard rules are guidelines that must be followed.
• SOPs are detailed step-by-step instructions on how to perform a specific task or operation.

• Standard rules are general guidelines or regulations that must be followed in a particular setting.

• SOPs help in maintaining consistency, quality, and ef...read more
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Online test on technical and aptitude with maths

Q1. Your favorite subject
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Q2. What have you learned in your training
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Domain based questions and basic aptitude question

Q1. About distillation column, basic questions ,cooling tower concept.
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Q2. Difference between CSTR and PFR, Pumps ,Heat Exchanger.
Ans. 
CSTR and PFR are types of reactors, pumps are used to move fluids, heat exchangers transfer heat between fluids.
• CSTR (Continuous Stirred Tank Reactor) has a constant volume and operates under steady-state conditions.

• PFR (Plug Flow Reactor) has a varying volume and operates under unsteady-state conditions.

• Pumps are mechanical devices used to move fluids from one place to another, like centrifugal pumps or positive displ...read more
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Q3. What is cracking
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Cracking is a process in which complex hydrocarbon molecules are broken down into simpler molecules.
• Cracking is a refining process used to convert large hydrocarbon molecules into smaller, more valuable ones.

• It is done by breaking the carbon-carbon bonds in the molecules.

• Examples include catalytic cracking and steam cracking.
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Q4. What is Reforming
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Reforming is a process used in the petroleum industry to convert low-octane naphtha into high-octane gasoline.
• Reforming involves rearranging the molecular structure of hydrocarbons to increase their octane rating.

• It is typically done using a catalyst at high temperatures and pressures.

• The process can also produce hydrogen gas as a byproduct.

• Reforming is an important step in the production of gasoline and other fuels in...read more
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Q5. What is range and approach of cooling tower
Ans. 
The range of a cooling tower refers to the maximum distance at which it can effectively cool air, while the approach is the temperature difference between the cooled water and the entering air.
• Range of a cooling tower is typically around 5-20 degrees Fahrenheit

• Approach of a cooling tower is usually around 8-15 degrees Fahrenheit

• The range and approach of a cooling tower can vary based on factors such as design, size, an
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Q1. What is Heat of formation
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Heat of formation is the energy released or absorbed when one mole of a compound is formed from its elements in their standard states.
• Heat of formation is also known as standard enthalpy of formation.

• It is typically measured in units of kJ/mol.

• Negative heat of formation indicates exothermic reaction, while positive heat of formation indicates endothermic reaction.

• For example, the heat of formation of water (H2O) is -28
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Q2. What is heat of reaction
Ans. 
Heat of reaction is the amount of heat released or absorbed during a chemical reaction.
• Heat of reaction can be exothermic (heat released) or endothermic (heat absorbed).

• It is typically measured in units of joules or calories.

• Examples include combustion reactions releasing heat and photosynthesis reactions absorbing heat.
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1st aptitude followed by psychometric test .

Q1. 1. How you will select a heat exchanger for different type of fluids.
Ans. 
The selection of a heat exchanger for different fluids depends on factors such as fluid properties, flow rates, and heat transfer requirements.
• Identify the properties of the fluids such as viscosity, density, and thermal conductivity.

• Determine the flow rates and pressure drops of the fluids.

• Select the appropriate type of heat exchanger such as shell and tube, plate and frame, or spiral.

• Consider the heat transfer requir...read more
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Q2. What Is reflux ratio.
Ans. 
Reflux ratio is the ratio of the amount of liquid refluxed to the amount of liquid that is being distilled.
• It is an important parameter in distillation processes.

• It helps in determining the efficiency of the distillation column.

• A high reflux ratio results in a higher purity of the distillate.

• Reflux ratio can be adjusted to optimize the distillation process.

• It is calculated as the ratio of the reflux flow rate to the di
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