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I was interviewed in Jan 2025.
Active power is the actual power consumed by a system, while reactive power is the power that oscillates between the system and the source.
Active power is the real power consumed by electrical devices and is measured in watts (W).
Reactive power is the power that flows back and forth between the source and the load, without performing any useful work.
The combination of active power and reactive power gives the total pow...
Different types of temperature sensors include thermocouples, RTDs, thermistors, and infrared sensors. RTD stands for Resistance Temperature Detector and PT100 is a type of RTD.
Thermocouples: measure temperature based on voltage produced by two different metals joined together
RTDs (Resistance Temperature Detectors): measure temperature by changes in electrical resistance
Thermistors: measure temperature based on changes...
BMS are systems that control and monitor building operations, such as HVAC, lighting, and security, to improve efficiency and occupant comfort.
BMS integrate various building systems to centralize control and monitoring.
They use sensors and actuators to collect data and adjust settings based on predefined parameters.
BMS can optimize energy usage, reduce maintenance costs, and improve occupant comfort.
Examples of BMS inc...
Forward flow is the direct action of the controller on the process, while backward flow is the feedback from the process to the controller in a PID control system.
Forward flow is the control action that directly affects the process based on the setpoint and error signal.
Backward flow is the feedback mechanism where the process output is compared to the setpoint to generate an error signal for the controller.
In a PID co...
I am a Senior Application Engineer with 8 years of experience in developing and implementing software solutions for various industries.
8 years of experience in software development
Proficient in programming languages such as Java, C++, and Python
Strong background in designing and implementing complex applications
Experience working with cross-functional teams to deliver high-quality solutions
Proven track record of succes...
My family background is diverse with members in various professions. My father is a retired engineer.
Diverse family background
Father is a retired engineer
Seeking new challenges and opportunities for growth in a different environment.
Desire for new challenges and learning opportunities
Seeking career advancement and growth
Interest in working with different technologies or industries
Better work-life balance or company culture
Relocation or commute reasons
Modbus and BACnet are communication protocols used in Building Management Systems (BMS) to enable devices to communicate with each other.
Modbus is a serial communication protocol commonly used for connecting industrial electronic devices. It is simple and easy to implement.
BACnet is a protocol specifically designed for building automation and control networks. It allows different devices from different manufacturers to...
I applied via Naukri.com and was interviewed in Feb 2024. There were 2 interview rounds.
Choose voice alarm system based on building size, occupancy, layout, and emergency response requirements.
Consider building size and layout to determine coverage area
Evaluate occupancy levels to ensure system can reach all occupants
Assess emergency response requirements to determine necessary features
Choose a system with clear and intelligible voice messages for effective communication
Ensure system complies with relevan...
I applied via Naukri.com and was interviewed before Jan 2022. There were 5 interview rounds.
I applied via Campus Placement and was interviewed before Jan 2023. There were 3 interview rounds.
General Aptitude Test.
BMS stands for Building Management System, used to monitor and control building systems like HVAC, lighting, and security.
BMS helps optimize energy usage and improve building efficiency.
It can integrate various systems like HVAC, lighting, security, and fire alarms for centralized control.
BMS can provide real-time data and analytics for better decision-making in building management.
Examples of BMS vendors include Sieme
PID loops are a type of control loop feedback mechanism used in systems to maintain a desired setpoint by adjusting the process inputs.
PID stands for Proportional-Integral-Derivative, which are the three control terms used in the loop.
Proportional term responds to the current error value.
Integral term deals with the accumulation of past errors.
Derivative term predicts future errors based on the rate of change.
PID loops...
Johnson Controls interview questions for designations
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posted on 22 Mar 2015
I applied via Walk-in and was interviewed before Sep 2020. There were 5 interview rounds.
I applied via Naukri.com and was interviewed before May 2020. There were 5 interview rounds.
I applied via Naukri.com and was interviewed before Jun 2019. There were 3 interview rounds.
Implement stack data structure
Use an array or linked list to store elements
Push operation adds element to top of stack
Pop operation removes element from top of stack
Peek operation returns top element without removing it
Global variables are accessible from any part of the program and can be modified by any function.
Global variables are declared outside of any function.
They can be accessed and modified by any function in the program.
If a function modifies the value of a global variable, the new value is visible to all other functions.
Global variables can be useful for sharing data between functions.
However, overuse of global variables
Program to transpose a matrix
Iterate through rows and columns of the matrix
Swap the elements at (i,j) and (j,i) positions
Return the transposed matrix
Pre and post fix operators are used to increment or decrement a value before or after it is used in an expression.
Pre-fix operator (++x) increments the value of x and returns the new value.
Post-fix operator (x++) returns the value of x and then increments it.
Both operators can be used with variables of numeric data types.
They can also be used with pointers to increment or decrement the memory address they point to.
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