Johnson Controls BMS Technician Interview Questions and Answers

I took an aptitude exam that measures critical thinking skills.

Q1. What are your salary expectations?
Ans. 
My salary expectations are based on my experience, qualifications, and the industry standard.
• Consider my experience and qualifications when determining salary expectations

• Research industry standards for Instrumentation Technicians in the area

• Open to negotiation based on benefits and opportunities for growth
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Q2. Where are you from?
Ans. 
I am from a small town in the Midwest called Springfield.
• I grew up in a close-knit community surrounded by farmland.

• The town had a population of around 10,000 people.

• It was known for its annual county fair and local diner.

• I attended the local high school before moving to pursue my career.
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Q1. What is combined-cycle power plant?
Ans. 
A combined-cycle power plant is a type of power plant that uses both gas and steam turbines to generate electricity efficiently.
• Combines gas turbine and steam turbine in one plant

• Gas turbine generates electricity by burning fuel and spinning a generator

• Waste heat from gas turbine used to produce steam for steam turbine

• Steam turbine generates additional electricity

• Higher efficiency compared to traditional power plants
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Q2. What is surge protection?
Ans. 
Surge protection is a measure taken to protect electrical equipment from voltage spikes or surges.
• Surge protectors are devices that divert excess voltage away from sensitive equipment.

• They are commonly used to protect computers, TVs, and other electronics from power surges.

• Surge protection can help prevent damage to equipment and data loss.

• Lightning strikes and power outages are common causes of power surges.
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Q3. What is the difference between Thermocouple and RTD?
Ans. 
Thermocouples measure temperature using the voltage generated by two different metals, while RTDs use the change in resistance of a metal wire.
• Thermocouples use two different metals to generate a voltage proportional to temperature, while RTDs use a metal wire with a known resistance-temperature relationship.

• Thermocouples are typically less accurate but have a wider temperature range compared to RTDs.

• RTDs are more stab...read more
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Q1. Why you want to join Rockwell
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Q1. How does chiller operate
Ans. 
A chiller operates by removing heat from a liquid through a refrigeration cycle and then transferring that heat to the air outside.
• Chiller absorbs heat from a liquid coolant, typically water or a mixture of water and glycol.

• The absorbed heat is transferred to the refrigerant in the evaporator, causing it to evaporate and absorb more heat.

• The refrigerant is then compressed, raising its temperature and pressure, before b...read more
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Q2. What is the protocol used in bMS and what is the buadrate
Ans. 
BMS uses BACnet protocol and the baud rate can vary depending on the system.
• BMS typically uses the BACnet protocol for communication

• The baud rate in BMS systems can vary depending on the specific system and requirements

• Common baud rates for BMS systems include 9600, 19200, and 38400
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Q3. Difference between PLC and DDC
Ans. 
PLC is a programmable logic controller used for industrial automation, while DDC is a direct digital control system used for building automation.
• PLC is typically used in industrial settings to control machinery and processes.

• DDC is commonly used in building automation systems to control HVAC, lighting, and other building systems.

• PLC programming is usually ladder logic or function block diagram, while DDC programming is...read more
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Q1. Who is the encoder
Ans. 
An encoder is a device or circuit that converts information from one format to another.
• An encoder can be a hardware device or a software program.

• In the context of electrical engineering, an encoder is often used to convert analog signals into digital signals.

• Encoders are commonly used in communication systems, robotics, and industrial automation.

• Examples of encoders include rotary encoders used in motor control and opt
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