UTL Solar PCB Design Engineer Interview Questions, Process, and Tips

Basic electronic, op-amp, online offline inverter block diagram, current/voltage calculation in loop

Q1. Clearance/creepage, trace width calculation, EMI-EMC
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Q2. Diff between clearance and creepage?
Ans. 
Clearance is the shortest distance between two conductive parts, while creepage is the shortest distance along the surface of an insulating material between two conductive parts.
• Clearance is the shortest distance between two conductive parts, measured through air or other insulating materials.

• Creepage is the shortest distance along the surface of an insulating material between two conductive parts.

• Clearance is importan...read more
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Q3. How to calculate trace width? if u have 15A current then what is your trace width?
Ans. 
Trace width can be calculated using online calculators or formulas based on current carrying capacity and copper thickness.
• Use online trace width calculators or formulas like IPC-2221 to determine trace width based on current carrying capacity and copper thickness.

• Consider factors like temperature rise, copper weight, and trace length when calculating trace width.

• For example, for a 15A current, with 1oz copper thicknes...read more
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Q4. What is EMI/EMC? how to reduce it from your design?
Ans. 
EMI/EMC stands for Electromagnetic Interference/Electromagnetic Compatibility. It refers to the unwanted electromagnetic emissions and susceptibility of electronic devices.
• Use proper grounding techniques to minimize EMI/EMC

• Shield sensitive components with metal enclosures or shields

• Use EMI filters on input/output lines

• Minimize signal loop area to reduce EMI

• Properly route high-speed signals to minimize EMI
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Q5. You are very slow in designing what should you do to improve yourself?
Ans. 
To improve my speed in designing, I would focus on improving my efficiency, time management skills, and seeking feedback for areas of improvement.
• Identify areas where I am spending too much time and find ways to streamline the process

• Set specific goals and deadlines for each stage of the design process

• Seek feedback from colleagues or mentors on ways to improve my efficiency

• Practice regularly to improve my skills and sp...read more
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