Rakuten Symphony Interview Questions, Process, and Tips

UPS stands for Uninterruptible Power Supply, a device that provides emergency power to a load when the input power source fails.

• UPS devices typically provide power for a short amount of time to allow for proper shutdown of equipment during a power outage.

• They can also protect against power surges and fluctuations.

• UPS units come in various sizes and capacities, ranging from small units for personal computers to large un...read more

VRF system stands for Variable Refrigerant Flow system, which is a type of HVAC system that can control the amount of refrigerant flowing to multiple indoor units.

• VRF system uses refrigerant as the cooling and heating medium

• It can provide individualized comfort control in different zones of a building

• The system can adjust the refrigerant flow based on the heating or cooling requirements of each zone

• VRF systems are ener...read more

The starting torque of a DG (diesel generator) is the torque produced by the engine when it starts up.

• Staring torque is the torque produced by the engine at the moment of starting.

• It is important for ensuring the engine can overcome initial inertia and start rotating.

• Staring torque is typically higher than running torque to overcome initial resistance.

• Factors affecting starting torque include engine size, design, and l...read more

The primary winding of a transformer is connected to the input voltage source, while the secondary winding is connected to the output load.

• Primary winding is connected to the input voltage source

• Secondary winding is connected to the output load

• The ratio of turns between primary and secondary windings determines the voltage transformation

• The windings are usually insulated to prevent short circuits

The power factor is a measure of how effectively electrical power is being converted into useful work output.

• Power factor is the ratio of real power to apparent power in an electrical system.

• It is a number between 0 and 1, with 1 indicating perfect efficiency.

• Low power factor can result in increased energy costs and inefficient use of electrical power.

• Power factor correction techniques can be used to improve power fact...read more

Reverse a given string

• Create an empty string to store the reversed string

• Iterate through the original string from end to start and append each character to the new string

• Return the reversed string

Collection framework is a set of classes and interfaces that provide a way to store and manipulate groups of objects. Lambda expressions are a way to write concise code for functional interfaces.

• Collection framework in Java includes interfaces like List, Set, Map, and classes like ArrayList, HashSet, HashMap.

• Lambda expressions in Java allow you to write inline functions for functional interfaces, reducing boilerplate c...read more

Spring Boot is a framework for building Java-based web applications, while Hibernate ORM is a tool for mapping Java objects to database tables.

• Spring Boot is a framework that simplifies the process of building Java-based web applications by providing a set of pre-configured tools and libraries.

• Hibernate ORM is a tool that maps Java objects to database tables, allowing developers to interact with databases using object-...read more

Effective customer service is maintained through clear communication, timely responses, empathy, and going above and beyond to meet customer needs.

• Maintain clear and open communication with customers to address their concerns and provide updates on their inquiries.

• Respond to customer inquiries and issues in a timely manner to show that their concerns are being taken seriously.

• Show empathy towards customers by actively ...read more