Hitachi Energy Engineer Trainee Interview Questions and Answers

In aptitude test , the question comes on reasoning and aptitude and English which carries 70 mark and 30 mark questions comes under respective branch ( Basically in electrical engineering)

Q1. Question regarding Transformer Protection and distribution system
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Q2. What is deferential Protection of transformer? What is relay? What is CTand PT? Etc .
Ans. 
Differential protection of a transformer is a method of protecting the transformer from internal faults by comparing the currents entering and leaving the transformer.
• Differential protection compares the current entering and leaving the transformer to detect any internal faults.

• Relays are devices that sense abnormal conditions in electrical circuits and initiate appropriate actions to protect the system.

• CT (Current Tra...read more
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Q1. What is difference between electrical and electronics
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Electrical engineering deals with the study and application of electricity, while electronics focuses on the study and application of electronic devices and circuits.
• Electrical engineering primarily deals with the generation, transmission, and distribution of electrical power.

• Electronics focuses on the design and development of electronic circuits and devices.

• Electrical engineering involves working with large-scale pow...read more
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Q2. Working principle generator and transformer
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Q3. What do you means by Plant capacity
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Plant capacity refers to the maximum output or production capability of a manufacturing facility.
• Plant capacity is the maximum amount of goods or services that a plant can produce within a given time period.

• It is often measured in terms of units produced per hour, day, week, or month.

• Factors that determine plant capacity include the size of the facility, the efficiency of the production process, and the availability of...read more
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The test included both technical and aptitude questions of 100 marks each question contains 1 marks each. the passing marks was 50 and the level of questions is easy to moderate.

Q1. Difference between overhead and underground cables.
Ans. 
Overhead cables are installed above ground while underground cables are buried below ground.
• Overhead cables are exposed to weather conditions and can be affected by storms or falling trees.

• Underground cables are protected from weather and physical damage, but are more expensive to install and repair.

• Overhead cables are easier to access for maintenance and repairs compared to underground cables.

• Examples: Overhead power ...read more
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Quantitative,verbal and reasoning

Q1. What is fuse and its benefit?
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Q2. Explain your final year pro4
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Written & MCQ test conducted

Imaginary topic on industrial situation, easy one, time 20 minutes

Q1. HR questions and technical questions
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Q2. Basic technical question on subject
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Q1. Power plants supply working
Ans. 
Power plants supply electricity to meet the demand of consumers and industries.
• Power plants generate electricity through various methods such as burning fossil fuels, nuclear reactions, or renewable sources like wind or solar power.

• The electricity generated is transmitted through power lines to homes, businesses, and industries.

• Power plants play a crucial role in ensuring a reliable supply of electricity to meet the ne...read more
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First was Assesment which consists of 4 section quant, logical, verbal and last one technical , and duration of test was 3 hours. test difficulty level is medium. You have to be very good with aptitude and core electronics subjects in curriculum.

Q1. Explain communication protocols, what is radio waves and microwaves, network topologies, basic network theorems , RTOS
Ans. 
Explanation of communication protocols, radio waves, microwaves, network topologies, basic network theorems, and RTOS.
• Communication protocols are a set of rules that govern the exchange of data between devices.

• Radio waves and microwaves are types of electromagnetic waves used for wireless communication.

• Network topologies refer to the physical or logical arrangement of devices in a network.

• Basic network theorems include...read more
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Q2. In detail questioning on project everything from scratch it's architecture , block diagram , working etc.
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Q3. Basic concepts from analog and digital electronics .
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Q4. Some of the questions on Hobbies mentioned in interview, just be perfect with your resume.
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Q1. Are you willing to relocate ? Do you have any plans for post graduation? About family background .
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There are 60 Questions of aptitude including 30 questions of logical reasoning and 30 quantitive aptitude

They gives us topic of electrical vehicle pros and cons

Q1. Stress strain Curve in SOM
Ans. 
Stress-strain curve is a graphical representation of the relationship between stress and strain in a material.
• It shows how a material behaves under stress and how it deforms under strain.

• It is used to determine the elastic modulus, yield strength, and ultimate strength of a material.

• The curve has three regions: elastic, plastic, and fracture.

• Examples of materials with different stress-strain curves include rubber, stee
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Q2. Iron carbon diagram from material Engineering
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Iron carbon diagram is a graphical representation of the phases of iron-carbon alloys at different temperatures and carbon concentrations.
• The diagram shows the relationship between carbon content, temperature, and the resulting microstructure of the alloy.

• It is used to determine the properties of steel and cast iron.

• The diagram consists of three regions: austenite, ferrite, and cementite.

• The eutectic point on the diagr...read more
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Q3. Project Related questions
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Q4. Internship related questions
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Q5. Practical Examples of Engineering in surrounding
Ans. 
Engineering is all around us, from the buildings we live in to the technology we use daily.
• The design and construction of buildings and infrastructure

• The development of transportation systems

• The creation of electronic devices and software

• The design and manufacture of medical equipment

• The development of renewable energy sources
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