Rakuten Symphony Interview Questions, Process, and Tips for Experienced

Q1. What is the UPS
Ans. 
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
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Q2. What is the VRF System
Ans. 
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
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Q3. What is the starring torque of DG
Ans. 
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
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Q4. What are the connectionof transformer primary winding & secondry winding
Ans. 
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
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Q5. What is the power fecoter
Ans. 
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
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Q1. Tell me about collection framework and lambda expression
Ans. 
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
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Q2. What is the difference between Spring Boot and Hibernate ORM?
Ans. 
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
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Q1. How do you maintain effective customer service?
Ans. 
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
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Q1. Generic HR questions
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Q1. Telecommunications Knowledge and Peoduct Management questions
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Q2. Requirements gathering and sign off
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Q1. Behavioural and Leadership questions
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Q2. Situation based questions
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Q1. Asking questions on java only
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2 java coding question woth some java fundamental mcqs