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I applied via Naukri.com and was interviewed in Sep 2021. There were 3 interview rounds.
I applied via Walk-in and was interviewed in Feb 2021. There were 4 interview rounds.
Automation is the use of technology to perform tasks without human intervention.
Automation involves the use of software, hardware, and other technologies to perform tasks.
It can be used to increase efficiency, reduce errors, and save time and money.
Examples include automated manufacturing processes, robotic assembly lines, and automated testing.
Automation can also be used in industries such as finance, healthcare, and ...
PLC programs can be written in various languages such as ladder logic, structured text, function block diagram, and sequential function chart.
Ladder logic is the most commonly used language in PLC programming.
Structured text is similar to programming languages like C and Pascal.
Function block diagram uses graphical blocks to represent functions.
Sequential function chart is used for complex processes with multiple steps...
There are various types of PLCs with different communication protocols.
PLC types include Programmable Logic Controller, Compact Programmable Logic Controller, Modular Programmable Logic Controller, and more.
Communication protocols include Modbus, Profibus, DeviceNet, Ethernet/IP, and more.
The type of PLC and communication protocol used depends on the specific automation application.
PLCs can communicate with other devic...
VFD stands for Variable Frequency Drive.
It is an electronic device that controls the speed of an AC motor by varying the frequency of the electrical supply to the motor.
It is used to save energy and improve process control in industrial applications.
VFDs are commonly used in HVAC systems, pumps, fans, and conveyors.
They can also be used to control the speed of electric vehicles and wind turbines.
VFD is used to control the speed of AC motors and save energy.
Variable frequency drive (VFD) is used to control the speed of AC motors.
It saves energy by adjusting the motor speed to match the load requirements.
VFDs also provide soft start and stop, reducing mechanical stress on the motor.
They can improve process control and reduce maintenance costs.
Examples of VFD applications include HVAC systems, pumps, and conveyor
VFD selection depends on motor voltage, current, and power rating.
Check motor nameplate data for voltage, current, and power rating
Select VFD with compatible voltage and current rating
Ensure VFD power rating is equal to or greater than motor power rating
Consider additional features such as overload protection and communication protocols
Consult manufacturer's specifications and guidelines
SCADA stands for Supervisory Control and Data Acquisition. It is a system used for monitoring and controlling industrial processes.
SCADA systems are used in various industries such as oil and gas, water treatment, and manufacturing.
They collect data from sensors and other devices and display it in a graphical interface for operators to monitor.
SCADA systems can also be used to control processes remotely, such as turnin...
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
Ohm's law is a fundamental law of electrical engineering.
It states that the current through a conductor is directly proportional to the voltage across it.
The proportionality constant is the resistance of the conductor.
The formula for Ohm's law is I = V/R, where I is the current, V is th...
Power factor is the ratio of real power to apparent power in an AC circuit.
Power factor = Real power / Apparent power
It is measured in a scale of 0 to 1 or 0 to 100%
A power factor of 1 means all the power is being used efficiently
A power factor of less than 1 means some power is being wasted
Capacitors can be used to improve power factor
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I applied via Recruitment Consultant and was interviewed in Jul 2021. There were 3 interview rounds.
Communication protocols are rules and standards for data exchange between devices.
TCP/IP
HTTP
FTP
SMTP
Modbus
Sink is a destination where data is sent, while source is where data originates from.
Sink receives data, while source sends data
Sink is typically the end point in a data flow, while source is the starting point
Examples: Sink - Database, Source - Sensor
posted on 15 Jan 2024
posted on 20 Feb 2015
posted on 10 Sep 2017
I was interviewed before Sep 2016.
posted on 10 Sep 2015
I applied via PLACEMENT
posted on 12 May 2018
I was interviewed before Mar 2021.
Round duration - 60 Minutes
Round difficulty - Medium
This round started with some questions from Programmable Logic Controllers or PLC followed by some basic questions from Intel 8051 Microcontroller.
PLCs are used to control machinery and automate processes in industrial settings.
Monitoring inputs from sensors
Executing control algorithms
Communicating with other devices
Logging data for analysis
Implementing safety functions
Examples: controlling a conveyor belt, regulating temperature in a furnace
Ladder logic programming is a graphical programming language used for PLCs, with basic elements like contacts, coils, timers, and counters.
Ladder logic consists of rungs, which are made up of inputs (contacts) and outputs (coils).
Contacts represent conditions that must be met for the output to be energized.
Coils are outputs that are energized when the conditions of the contacts are met.
Timers and counters are used to c...
PLC inputs and outputs include digital inputs, digital outputs, analog inputs, and analog outputs.
Digital inputs: used for receiving binary signals (on/off, high/low). Examples: push buttons, limit switches.
Digital outputs: used for sending binary signals. Examples: relays, solenoids.
Analog inputs: used for receiving continuous signals. Examples: temperature sensors, pressure transducers.
Analog outputs: used for sendin...
The S7 controller offers high performance and flexibility but can be complex to program and expensive.
Advantages: high performance, flexibility, scalability
Disadvantages: complexity in programming, expensive
Example: S7-1200 offers fast processing speeds and can be easily expanded with additional modules
Example: Programming for S7 controllers may require specialized training and expertise
The time stamp in S7-200 PLC is used to record the time when a specific event occurs.
Time stamp is a feature in S7-200 PLC that records the time when a specific event happens.
It helps in tracking the sequence of events and troubleshooting issues.
Time stamp can be used to monitor the performance of the PLC system.
Example: A time stamp can be recorded when a sensor detects a change in temperature.
Example: Time stamp can ...
Jnc stands for Jump and Call in the context of microcontrollers.
Jnc is an instruction used in microcontrollers to jump to a specified address if the carry flag is not set.
It is commonly used in conditional branching operations in microcontroller programming.
For example, in 8051 microcontroller assembly language, the instruction JNC label will jump to the specified label if the carry flag is not set.
The types of interrupts in the Intel 8051 microcontroller include external hardware interrupts, timer interrupts, and serial communication interrupts.
External hardware interrupts are triggered by external devices connected to the microcontroller.
Timer interrupts are generated by the internal timers of the microcontroller.
Serial communication interrupts occur when data is received or transmitted through the serial port.
...
Round duration - 50 Minutes
Round difficulty - Medium
This round was heavily inclined towards Operating System and Computer Networks and the interviewer asked questions revolving around the fundamentals of the subject.
A bootstrap program is a small program that initializes the operating system on a computer.
Bootstrap program is stored in ROM or EEPROM and is executed when the computer is powered on.
It loads the operating system kernel into memory and starts its execution.
Bootstrap program is responsible for setting up the initial state of the operating system.
Examples include BIOS (Basic Input/Output System) in PCs and UEFI (Unified
Demand paging is a memory management scheme where pages are only brought into memory when they are demanded by the program.
Pages are loaded into memory only when needed
Helps in reducing the amount of physical memory required
Improves overall system performance by allowing more processes to run simultaneously
Commonly used in virtual memory systems
Five essential UNIX commands are ls, cd, pwd, mkdir, and rm.
ls - list directory contents
cd - change directory
pwd - print working directory
mkdir - make directory
rm - remove files or directories
Different types of VPN include remote access VPN, site-to-site VPN, and client-to-site VPN.
Remote access VPN allows individual users to connect to a private network from a remote location.
Site-to-site VPN connects entire networks together over the internet.
Client-to-site VPN allows individual devices to connect to a private network.
Examples include OpenVPN, IPsec, and SSL VPN.
The OSI Reference Model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.
The OSI Reference Model stands for Open Systems Interconnection Reference Model.
It consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
Each layer has specific functions and communicates with the adjacent layers for data trans...
TCP is a connection-oriented protocol that ensures reliable data delivery, while UDP is a connectionless protocol that focuses on speed.
TCP stands for Transmission Control Protocol and is used for reliable data transmission.
TCP establishes a connection between sender and receiver before data transfer.
TCP uses sequencing and acknowledgment to ensure data integrity.
UDP stands for User Datagram Protocol and is used for fa...
Round duration - 30 Minutes
Round difficulty - Easy
This is a cultural fitment testing round .HR was very frank and asked standard questions. Then we discussed about my
role.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
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Rating in categories
Design Engineer
45
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Production Engineer
42
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Estimation Engineer
34
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Service Engineer
32
salaries
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Design & Development Engineer
28
salaries
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Siemens
ABB
BHEL
Larsen & Toubro Limited