Johnson Controls BMS Operator & BMS Technician Interview Questions and Answers

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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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. What is encoder, proxy
Ans. 
An encoder is a device that converts motion into an electrical signal. A proxy is a server that acts as an intermediary for requests from clients.
• Encoders are used in various applications such as robotics, automation, and CNC machines.

• Proxies are commonly used in computer networks to improve security and performance.

• An example of an encoder is a rotary encoder that converts the rotational motion of a shaft into an elec...read more
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Q2. How to chake transformer
Ans. 
To check a transformer, perform visual inspection, measure voltage and current, and test insulation resistance.
• Perform a visual inspection of the transformer for any physical damage or signs of overheating.

• Measure the voltage and current using a multimeter to ensure they are within the rated values.

• Test the insulation resistance using a megohmmeter to ensure it is above the minimum value.

• Perform a polarity test to ensu...read more
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Q3. How to chake motor conditions
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To check motor conditions, perform visual inspection, measure voltage and current, check for abnormal noises, and test motor performance.
• Perform a visual inspection to check for any physical damage or loose connections.

• Measure the voltage and current using a multimeter to ensure they are within the specified range.

• Listen for any abnormal noises such as grinding or squealing that may indicate motor issues.

• Test the motor...read more
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Q4. Why use in VFD drive
Ans. 
VFD drives are used to control the speed and torque of electric motors, resulting in energy savings and improved motor performance.
• VFD drives allow for precise control of motor speed and torque.

• They can be used to match the motor speed to the load requirements, resulting in energy savings.

• VFD drives can improve motor performance by reducing mechanical stress and wear.

• They enable soft starting and stopping of motors, re...read more
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Q5. What different in Acb, vcb breaker
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ACB and VCB breakers are both types of circuit breakers used in electrical systems, but they differ in their operating mechanisms.
• ACB stands for Air Circuit Breaker, while VCB stands for Vacuum Circuit Breaker.

• ACB breakers use air as the medium for arc extinction, while VCB breakers use vacuum.

• ACB breakers are typically used for low voltage applications, while VCB breakers are used for medium to high voltage applicatio...read more
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Q6. What is Di or Do how to work
Ans. 
Di and Do are electrical protection devices used in low voltage systems to protect against overcurrent and short circuits.
• Di stands for Differential Current Protection and is used to detect and protect against ground faults and leakage currents.

• Do stands for Overcurrent Protection and is used to protect against overloads and short circuits.

• Di works by comparing the current flowing in the live and neutral conductors, an...read more
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