APT POWER ENGINEERING CAD Design Engineer Interview Questions and Answers

Q1. What are the Parts of Inverter
Ans. 
The parts of an inverter include DC input, power transistors, transformer, output filter, and control circuit.
• DC input: where the direct current is supplied to the inverter

• Power transistors: responsible for converting DC to AC

• Transformer: used to step up or step down the voltage

• Output filter: smoothens the output waveform

• Control circuit: manages the operation of the inverter
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Q2. Formula of Radiation of the Day.
Ans. 
The formula for radiation of the day is based on the Stefan-Boltzmann law, which states that the total energy radiated per unit surface area of a black body is directly proportional to the fourth power of the body's absolute temperature.
• Radiation of the day is calculated using the Stefan-Boltzmann law: P = σAT^4

• P represents the power radiated per unit area, σ is the Stefan-Boltzmann constant, A is the surface area, and...read more
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Q3. What are the challenges you have faced in your previous plant and How did you overcome this.
Ans. 
Challenges faced in previous plant and how they were overcome
• One challenge was outdated equipment causing frequent breakdowns

• Implemented a preventive maintenance schedule to address the issue

• Another challenge was lack of skilled manpower

• Conducted training programs and hired experienced technicians

• Difficulty in meeting production targets due to inefficiencies

• Implemented lean manufacturing principles to streamline proces...read more
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Q1. Solar energy releted
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Q2. Manufacturing process of the printing line
Ans. 
The manufacturing process of the printing line involves various steps to produce printed materials efficiently.
• Designing the layout of the printing line

• Selecting the appropriate printing technology (e.g. offset, digital, flexography)

• Calibrating and setting up the printing equipment

• Testing the printing quality and making adjustments as needed

• Implementing quality control measures throughout the process
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Q1. What is optimize moisture content?
Ans. 
Optimize moisture content refers to adjusting the amount of moisture in a material to achieve the desired properties.
• Optimizing moisture content involves finding the right balance to enhance the quality and performance of a material.

• It is important in industries like agriculture, food processing, and construction.

• For example, in agriculture, optimizing moisture content in soil can improve crop growth and yield.
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Q2. Types of cement?
Ans. 
Types of cement include Portland cement, white cement, rapid hardening cement, and low heat cement.
• Portland cement is the most common type used in construction.

• White cement is used for architectural purposes and to create colored concrete.

• Rapid hardening cement sets quickly and is used in projects with tight deadlines.

• Low heat cement generates less heat during hydration and is used in large concrete structures.
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Last three projects compilition within the time, two International projects (Armenia , Sierra Leone ) . Around 32 minutes , As discussed with QA and QC of the projects 110 KV, 220KV , 400KV , 765 KV .

Q1. Only CTC discussion .
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Q2. What is your salary required ?
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Q1. CTC enquiry current and expected
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Q2. Previous employer and projects
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Q1. What does a practical CAD test involve?
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Q2. Design the layout
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Q1. Why you would like to switch?
Ans. Career Growth and better career-life balance
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Q2. Would you like to relocate?
Ans. Relocation is not an issue.
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Q1. What are the basic IEC standards in PV module design & type qualification; and safety qualification?
Ans. 
The basic IEC standards in PV module design & type qualification are IEC 61215 and IEC 61730 for design qualification, and IEC 61215 and IEC 61730 for type qualification. The safety qualification standard is IEC 61730.
• IEC 61215 is the standard for crystalline silicon terrestrial photovoltaic (PV) modules

• IEC 61730 is the standard for safety qualification of PV modules

• Design qualification ensures the module design meets ...read more
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Q2. Solar Backsheet layers regarding..
Ans. 
Solar backsheet layers provide protection and insulation for solar panels.
• Solar backsheet layers are typically made of a combination of materials such as polyester, fluoropolymer, and ethylene-vinyl acetate (EVA).

• The backsheet layers act as a barrier against moisture, UV radiation, and other environmental factors that can degrade the solar cells.

• They also provide electrical insulation to prevent short circuits and ensu...read more
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