10+ Contactx Resource Management Interview Questions and Answers

Answers to common questions related to electric bus maintenance and operation.

• The lifespan of a typical electric bus battery is around 5-10 years, depending on factors like usage patterns, charging practices, and temperature conditions.

• Total cost of ownership (TCO) for an electric bus includes initial purchase cost, maintenance expenses, fuel/electricity costs, and potential incentives. TCO for electric buses is usually lower than diesel buses over the long term.

• Safety precau...read more

The components used in EV powertrain department include battery, motor, inverter, gearbox, and charging system.

• Battery provides power to the motor

• Motor converts electrical energy into mechanical energy

• Inverter converts DC power from battery to AC power for the motor

• Gearbox controls the speed and torque of the motor

• Charging system charges the battery

IPM synchronous motor uses permanent magnets to create a rotating magnetic field that interacts with the stator windings.

• IPM synchronous motor has a rotor with permanent magnets that create a magnetic field

• The stator windings are energized with AC current to create a rotating magnetic field

• The interaction between the rotor and stator magnetic fields causes the motor to rotate

• IPM synchronous motor is more efficient and has better performance than traditional induction motors

Root Cause Analysis is a method used to identify the underlying cause of a problem, while Design of Experiments is a systematic approach to conducting experiments to optimize processes.

• Root Cause Analysis involves identifying the primary cause of a problem by asking 'why' multiple times to get to the root issue.

• Design of Experiments is a structured method for planning, conducting, analyzing, and interpreting controlled tests to optimize processes or products.

• Both techniques a...read more

Different types of relays are used depending on the application and requirements.

• Electromechanical relays

• Solid-state relays

• Thermal relays

• Reed relays

• Polarized relays

• Time-delay relays

• Overload protection relays

• Mercury-wetted relays

• Hybrid relays

A relay is an electrically operated switch that uses an electromagnet to mechanically open or close a circuit.

• Relays are used to control high voltage or high current circuits with a low voltage signal.

• They are commonly used in industrial control systems, automotive applications, and home automation.

• When a current flows through the coil of the relay, it creates a magnetic field that pulls the contacts together, completing the circuit.

• Relays can be normally open (NO) or normall...read more

There are three types of EV vehicles: Battery Electric Vehicles (BEVs), Plug-in Hybrid Electric Vehicles (PHEVs), and Hybrid Electric Vehicles (HEVs).

• Battery Electric Vehicles (BEVs) run solely on electricity and have no internal combustion engine.

• Plug-in Hybrid Electric Vehicles (PHEVs) have both an electric motor and a gasoline engine, and can run on either power source.

• Hybrid Electric Vehicles (HEVs) have an electric motor and a gasoline engine, but the electric motor is n...read more

Different kinds of CNC milling include vertical milling, horizontal milling, and 5-axis milling.

• Vertical milling: Spindle is vertical and workpiece is mounted on top of the table.

• Horizontal milling: Spindle is horizontal and workpiece is mounted on the side of the table.

• 5-axis milling: Allows for cutting on multiple axes simultaneously, increasing precision and complexity.

• Other types include gantry milling, high-speed milling, and specialty milling processes.

Stress strain curves show the relationship between stress and strain in a material under tension.

• Stress strain curves typically have three main regions: elastic deformation, plastic deformation, and necking.

• The elastic region shows linear relationship between stress and strain, where the material returns to its original shape once the stress is removed.

• The plastic region shows non-linear relationship between stress and strain, where permanent deformation occurs.

• Necking is the...read more

Line capacity enhancement involves optimizing production processes to increase output.

• Identify bottlenecks in the production line

• Implement lean manufacturing principles to streamline processes

• Invest in new equipment or technology to improve efficiency

• Train employees to work more effectively and reduce downtime

Value stream mapping is a lean management tool used to visualize and analyze the steps involved in delivering a product or service.

• It helps identify waste and inefficiencies in the process

• It provides a visual representation of the flow of materials and information

• It helps in identifying areas for improvement and optimizing the process

• Commonly used in manufacturing, healthcare, and service industries

To reduce RPT or PPM, focus on improving processes, training staff, implementing quality control measures, and utilizing technology.

• Implement lean manufacturing principles to streamline processes and reduce waste

• Provide regular training to staff to improve efficiency and reduce errors

• Implement quality control measures to catch issues before they escalate

• Utilize technology such as automation and data analytics to identify areas for improvement

• Regularly review and analyze perfo...read more

Safety in production line can be maintained by implementing strict safety protocols, providing proper training to employees, conducting regular safety inspections, and promoting a safety culture.

• Implement strict safety protocols to ensure all employees follow safety guidelines

• Provide proper training to employees on safety procedures and equipment usage

• Conduct regular safety inspections to identify and address potential hazards

• Promote a safety culture where employees prioritiz...read more

Welding is a process of joining two or more metal parts by heating the surfaces to their melting points and allowing them to cool and fuse together.

• Welding involves melting the metal parts to be joined

• The melted metal cools and solidifies to form a strong joint

• Different types of welding processes include MIG, TIG, and stick welding

• Welding requires protective gear such as gloves, helmets, and aprons

• Welding is used in various industries such as construction, manufacturing, and ...read more