Johnson Controls Hitachi Air Conditioning Interview Questions, Process, and Tips

VCR cycle is a technology that allows the compression ratio of an engine to be varied for optimal performance and efficiency.

• VCR cycle adjusts the compression ratio of an engine based on operating conditions.

• It can improve fuel efficiency and power output of the engine.

• Examples of VCR systems include Mazda's Skyactiv-X engine and Infiniti's VC-Turbo engine.

An expansion valve is a device in a refrigeration system that controls the flow of refrigerant into the evaporator.

• Regulates the flow of refrigerant into the evaporator to maintain proper temperature and pressure

• Helps in converting high-pressure liquid refrigerant into low-pressure liquid-vapor mixture

• Controls the superheat in the evaporator to ensure efficient cooling

• Examples include thermostatic expansion valves (TXV

I have knowledge about HVAC industry including principles of heating, ventilation, and air conditioning systems.

• Understanding of HVAC systems and components such as boilers, chillers, air handlers, and ductwork

• Knowledge of HVAC design principles and calculations for heating and cooling loads

• Familiarity with HVAC codes and standards like ASHRAE and building regulations

• Experience with HVAC troubleshooting and maintenance...read more

I completed multiple projects during my college experience, including a smart irrigation system and a mobile app for waste management.

• Developed a smart irrigation system using Arduino and sensors to optimize water usage in agriculture

• Created a mobile app for waste management to track waste collection schedules and promote recycling

• Collaborated with a team to design and implement a solar-powered car for a national compe

I come from a close-knit family of four with supportive parents and a younger sibling.

• Family of four

• Supportive parents

• Close-knit

• Younger sibling

Yes, I am willing to relocate for the right opportunity.

• I am open to relocating for career growth and new experiences.

• I understand that relocation may be necessary for certain job opportunities.

• I am flexible and adaptable to new environments and challenges.

The electrostatic force equation describes the force between two charged objects.

• The electrostatic force equation is given by F = k * (q1 * q2) / r^2, where F is the force, k is the electrostatic constant, q1 and q2 are the charges of the objects, and r is the distance between the objects.

• The force is attractive if the charges are opposite (one positive and one negative) and repulsive if the charges are the same (both ...read more

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Consists of two coils of wire, known as primary and secondary coils

• Primary coil is connected to a power source, inducing a magnetic field

• Magnetic field causes a voltage to be induced in the secondary coil

• Used in power distribution, voltage regulation, and isolation

• Examples include step-up transforme...read more

Voltage is the force that pushes electric current through a circuit.

• Voltage is the difference in electric potential between two points in a circuit

• It is measured in volts (V)

• Higher voltage means more force pushing the current

• Voltage is necessary for electrical devices to function properly

The Zeroth Law states that if two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other. The First Law states that energy cannot be created or destroyed, only transferred or converted. The Second Law states that the total entropy of an isolated system can never decrease over time.

• Zeroth Law: Systems in thermal equilibrium with a third system are in thermal equilibrium w...read more

To overcome office politics, focus on building positive relationships, maintaining professionalism, and communicating openly.

• Build positive relationships with colleagues by being friendly and supportive.

• Maintain professionalism by staying neutral in conflicts and avoiding gossip.

• Communicate openly and directly with colleagues to address any misunderstandings or issues.

• Focus on the work and goals of the organization rat...read more