Rishi Techtex Interview Questions and Answers

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Q1. Quality Stander Manufacturing sop
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Q1. Give introduction and tell how many members in your family and what do you do your father?
Ans. 
I have a small family with four members. My father is a retired government employee.
• I come from a small family with four members.

• My father is a retired government employee.

• I can provide more details about my family if required.
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Q2. Define distillation column.
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A distillation column is a vertical vessel used for separating a mixture of liquids into its individual components.
• It works on the principle of differential boiling points of the components in the mixture.

• The mixture is heated and vaporized, then the vapor rises up the column and condenses on the trays or packing material.

• The condensed liquid is then collected and separated into its individual components.

• Distillation c...read more
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Q3. Define T-x-y diagram.
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T-x-y diagram is a graph that shows the phase behavior of a mixture of three components.
• T-x-y diagram is used in chemical engineering to analyze the behavior of a mixture of three components.

• It shows the relationship between temperature, composition, and pressure.

• The diagram is used to determine the conditions under which a mixture will be in a single phase or multiple phases.

• It is also used to determine the compositio...read more
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Q4. Define MC thele diagram.
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MC Thele diagram is a graphical representation of the relationship between the main characteristics of a control system.
• MC Thele diagram is used to analyze and design control systems.

• It shows the relationship between the main characteristics of a control system, such as stability, speed of response, and steady-state error.

• The diagram consists of two axes, one representing the gain of the system and the other representi...read more
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Q5. Define reflux ratio and how is work in distillation column? How do work if increase or decrease the reflux ratio?
Ans. 
Reflux ratio is the ratio of liquid reflux to the distillate and affects the separation efficiency of a distillation column.
• Reflux ratio is a key parameter in distillation column design and operation.

• It is defined as the ratio of liquid reflux to the distillate.

• Increasing the reflux ratio increases the purity of the distillate but decreases the distillate flow rate.

• Decreasing the reflux ratio decreases the purity of th...read more
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Q6. Minimum reflux ratio and how do work? What is optimum reflux ratio?
Ans. 
Reflux ratio is the ratio of liquid reflux to the distillate. Optimum reflux ratio is the minimum reflux ratio that gives the desired purity.
• Minimum reflux ratio is the ratio at which the desired purity is achieved.

• Reflux ratio is important in distillation process to achieve desired purity.

• Optimum reflux ratio is the minimum reflux ratio that gives the desired purity.

• Reflux ratio can be calculated using the McCabe-Thie...read more
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Q7. Define heat exchanger and type of heat exchanger. How do work for type of fluid? Define baffles and what is role in heat exchanger?
Ans. 
Heat exchanger is a device used to transfer heat between two or more fluids of different temperatures.
• Types of heat exchangers include shell and tube, plate and frame, and finned tube.

• The type of fluid being used determines the material of construction for the heat exchanger.

• Baffles are plates or rods placed inside the heat exchanger to direct the flow of fluid and increase heat transfer efficiency.
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Q8. Define pump and valve and type of pumps and valve.
Ans. 
Pump is a mechanical device that moves fluids from one place to another. Valve is a device that controls the flow of fluids.
• Types of pumps include centrifugal, positive displacement, and axial flow pumps.

• Types of valves include gate, globe, ball, and butterfly valves.

• Pumps are used in various applications such as water supply, oil and gas, and chemical processing.

• Valves are used in industries such as power generation,
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Q9. Define centrifugal pump with diagram and proof why do call NSPH?
Ans. 
Centrifugal pump is a mechanical device used to transport fluids by converting rotational kinetic energy to hydrodynamic energy.
• Centrifugal pump consists of an impeller, casing, and inlet/outlet ports.

• The impeller rotates and creates a centrifugal force that moves the fluid towards the outlet.

• NSPH stands for Net Positive Suction Head and is a measure of the pressure required at the inlet to prevent cavitation.

• Cavitatio...read more
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Q1. Electrical department OSBL
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Q1. What is an electromagnetic flowmeter, and what are its applications?
Ans. 
An electromagnetic flowmeter is a device used to measure the flow rate of conductive liquids in a pipe by inducing a magnetic field and measuring the voltage generated.
• Works based on Faraday's law of electromagnetic induction

• Suitable for measuring flow rates of conductive liquids like water, acids, and slurries

• Commonly used in industries such as water treatment, chemical processing, and food & beverage

• Provides accu...read more
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Q2. What are logic gates, and what are their corresponding truth tables?
Ans. 
Logic gates are electronic devices that perform logical operations based on input signals.
• Logic gates are the building blocks of digital circuits.

• They take one or more binary inputs and produce a single binary output based on a specific logic function.

• The basic types of logic gates include AND, OR, NOT, NAND, NOR, XOR, and XNOR gates.

• Each logic gate has a corresponding truth table that shows the output for all possible...read more
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Q3. What is your understanding of SCADA (Supervisory Control and Data Acquisition) and DCS (Distributed Control System)?
Ans. 
SCADA is a centralized system used to monitor and control industrial processes, while DCS is a distributed system that allows for control at a local level.
• SCADA is used for monitoring and controlling processes in industries such as power plants, water treatment facilities, and manufacturing plants.

• DCS allows for control at a local level, with each control unit being responsible for a specific area of the process.

• SCADA ...read more
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Q4. What is the difference between a Programmable Logic Controller (PLC) and a Distributed Control System (DCS), and in what scenarios are each typically used?
Ans. 
PLC is used for discrete control of machines, while DCS is used for continuous control of processes.
• PLC is typically used for controlling individual machines or processes in manufacturing, automotive, and packaging industries.

• DCS is commonly used in industries such as oil and gas, chemical, and power generation for controlling continuous processes.

• PLCs are more cost-effective for small to medium-sized applications, whi...read more
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Q5. What parameters do we measure, and what are the various methods used for measurement?
Ans. 
Parameters measured in engineering and methods used for measurement
• Parameters measured include dimensions, temperature, pressure, flow rate, and electrical properties

• Methods used for measurement include rulers, thermocouples, pressure gauges, flow meters, and multimeters

• Calibration of instruments is important for accurate measurements

• Data acquisition systems can be used for continuous monitoring and recording of measur
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Q6. What is your understanding of the 4-20mA signal?
Ans. 
4-20mA signal is a standard current loop used in industrial control systems.
• 4-20mA signal is commonly used for transmitting analog signals in industrial automation.

• The signal range of 4-20mA allows for easy detection of faults in the system.

• It is a robust and reliable method of signal transmission, less susceptible to noise compared to voltage signals.

• Devices like sensors, transmitters, and controllers in industrial se...read more
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Through campus placement, Basics of chemical engineering principles.

Q1. Type of heat exchanger
Ans. 
Heat exchangers are devices used to transfer heat between two or more fluids, without them mixing together.
• There are three main types of heat exchangers: shell and tube, plate, and finned tube.

• Shell and tube heat exchangers consist of a shell with tubes running through it, allowing one fluid to flow through the tubes while another flows over the tubes.

• Plate heat exchangers use plates to separate the fluids and transfer...read more
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Q2. Types of distillation
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Distillation is a process used to separate components of a liquid mixture based on their boiling points.
• Types of distillation include simple distillation, fractional distillation, and steam distillation.

• Simple distillation is used to separate components with a large difference in boiling points.

• Fractional distillation is used for components with closer boiling points, using a fractionating column to achieve better sepa...read more
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