Nalco water General Operator Interview Questions and Answers

Q1. Maintenance phylosophy
Ans. Depends on equipment running hour, criticality, availability and standby.
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Q1. Basics of Water Treatment
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Q2. Working Principle of DM Plant
Ans. 
DM Plant removes impurities like salts and minerals from water using ion exchange process.
• DM Plant stands for Demineralization Plant.

• It uses ion exchange process to remove impurities like salts and minerals from water.

• It consists of cation exchange resin and anion exchange resin columns.

• Cations and anions in water are exchanged with hydrogen and hydroxyl ions in the resins.

• The treated water is then passed through mixed...read more
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Q1. Concrete structure and water supply related
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Q1. What are your salary expectations?
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Q2. Share details of your previous job.
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Q3. Where do you see yourself in 5 years?
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Detailed information about the previous company where i worked.Discussed with project manager regarding my roles and assignments i had taken on work location.Along with that we discussed about my academic projects and skills that i had mastered in my career

Interviewers gave me the task to elaborate the design of pollution control equipments and assessments

Q1. Which are the equipment used in steam turbine? And their principal and working and troubleshooting?
Ans. 
Equipment used in steam turbine include turbine blades, nozzles, casing, rotor, bearings, and governor.
• Turbine blades: convert steam energy into mechanical energy

• Nozzles: control the flow of steam into the turbine

• Casing: contains and directs the steam flow through the turbine

• Rotor: connected to the turbine blades and rotates to generate power

• Bearings: support the rotor and reduce friction

• Governor: regulates the speed o
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Q2. Tell us about the Woodward 505 ?
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Woodward 505 is a versatile control system used in industrial applications.
• The Woodward 505 is a widely used control system in industries such as power generation, oil and gas, and marine.

• It offers advanced features like PID control, sequencing, and communication capabilities.

• The Woodward 505 is known for its reliability and robustness in harsh operating environments.

• It can be easily integrated with various types of se
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Q3. Explain the structure of the Honeywell DCS ?
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The Honeywell DCS (Distributed Control System) is a modular system consisting of controllers, I/O modules, and operator stations.
• Consists of controllers, I/O modules, and operator stations

• Uses a network to communicate between components

• Allows for centralized control and monitoring of processes

• Supports various communication protocols such as Modbus, OPC, etc.

• Example: Honeywell Experion PKS
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Q4. What is PID and How does it work ?
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PID stands for Proportional-Integral-Derivative, a control loop feedback mechanism used in engineering.
• PID is a control algorithm that calculates an error value as the difference between a desired setpoint and a measured process variable.

• Proportional (P) control responds to the current error value.

• Integral (I) control accumulates past errors to correct the present error.

• Derivative (D) control predicts future errors bas...read more
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Q5. How to assign new chennal in Honeywell DCS ?
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To assign a new channel in Honeywell DCS, you need to access the configuration software and follow the steps to add the channel.
• Access the Honeywell DCS configuration software

• Navigate to the channel configuration section

• Add a new channel by specifying the channel number, type, and other relevant parameters

• Save the changes and verify the new channel is successfully assigned
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Q6. Tell the interlock and permissive of boiler and turbine?
Ans. 
Interlocks and permissives are safety mechanisms in place to prevent unsafe operation of boiler and turbine systems.
• Interlocks prevent certain actions from taking place unless specific conditions are met

• Permissives allow certain actions to take place only if specific conditions are met

• Example of interlock: Boiler feed pump interlock prevents the boiler from starting unless the feed pump is running

• Example of permissive:...read more
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