Johnson Controls Commissioning Engineer Interview Questions and Answers

TCS system stands for Turbine Control System, which is used in power plants to control and monitor the operation of turbines.

• TCS system is essential for ensuring the safe and efficient operation of turbines in power plants.

• It helps in controlling the speed, temperature, and other parameters of the turbine.

• TCS system also includes safety features to protect the turbine from damage.

• Examples of TCS systems include Woodwar

TCS (Temperature Control System) can be controlled using various methods such as PID controllers, PLCs, and SCADA systems.

• Use PID controllers to regulate temperature by adjusting the output based on the difference between the setpoint and actual temperature.

• Program PLCs to monitor and control temperature by receiving input from sensors and activating outputs to adjust heating or cooling devices.

• Implement SCADA systems ...read more

Scalance type selection is based on factors like network size, speed requirements, and redundancy needs.

• Consider the size of the network to determine the number of ports needed

• Evaluate the speed requirements to choose between Fast Ethernet or Gigabit Ethernet

• Assess the redundancy needs to decide on features like ring redundancy or port redundancy

• Examples: Scalance X-200 for small networks, Scalance X-400 for larger net

Load calculation in Engineering Design involves determining the amount of force or weight that a structure or component will need to support.

• Load calculation considers factors such as dead load, live load, wind load, seismic load, and temperature variations.

• Dead load refers to the weight of the structure itself and any permanent fixtures.

• Live load includes the weight of people, furniture, and other temporary items.

• Wind...read more

The challenge in designing and site activity is ensuring that the design is practical and can be successfully implemented on site.

• Ensuring that the design meets all technical requirements and specifications

• Coordinating with various teams involved in the project to ensure smooth execution

• Managing unexpected challenges that may arise during the erection and commissioning process

• Adapting the design if necessary to overcom...read more

Current is the flow of electric charge in a circuit.

• Current is measured in Amperes (A)

• It is the rate of flow of electric charge

• Current flows from high voltage to low voltage

• In a series circuit, the current is the same at all points

• In a parallel circuit, the total current is the sum of the currents through each branch

Soft starters are preferred over star-delta starters for motor start and run due to their ability to reduce inrush current and provide smoother acceleration.

• Soft starters provide a gradual increase in voltage to the motor, reducing inrush current and mechanical stress on the motor.

• Star-delta starters provide a sudden increase in voltage, resulting in high inrush current and mechanical stress on the motor.

• Soft starters ...read more

Encoders used in industrial include absolute, incremental, linear, rotary, magnetic, and optical encoders.

• Absolute encoders provide a unique code for each position

• Incremental encoders provide a pulse output for each position change

• Linear encoders measure linear motion

• Rotary encoders measure rotational motion

• Magnetic encoders use a magnetic field to detect position

• Optical encoders use light to detect position

VFD parameters are settings that control the operation of a variable frequency drive.

• VFD parameters include frequency, voltage, current, acceleration/deceleration time, and motor overload protection

• Frequency parameter determines the speed of the motor

• Voltage parameter determines the amount of voltage supplied to the motor

• Current parameter determines the amount of current supplied to the motor

• Acceleration/deceleration t...read more