Vivo Auditor Interview Questions, Process, and Tips for Freshers

Types of solder paste used in SMT include leaded, lead-free, water-soluble, no-clean, and low-temperature.

• Leaded solder paste contains lead and is commonly used in electronics manufacturing.

• Lead-free solder paste is environmentally friendly and complies with regulations such as RoHS.

• Water-soluble solder paste can be easily cleaned with water after soldering.

• No-clean solder paste leaves minimal residue after soldering a...read more

SMT (Surface Mount Technology) is a process used in electronics manufacturing to mount electronic components directly onto the surface of a printed circuit board (PCB).

• Components are placed onto the PCB using pick-and-place machines.

• Solder paste is applied to the PCB pads before components are placed.

• The PCB is then heated in a reflow oven to melt the solder and create a permanent connection.

• SMT allows for smaller, lig...read more

The zones name of a reflow oven typically include preheat, soak, reflow, and cooling zones.

• Preheat zone

• Soak zone

• Reflow zone

• Cooling zone

Different types of issues in SMT include solder joint defects, component misalignment, and insufficient solder paste.

• Solder joint defects: such as cold solder joints, insufficient solder, or solder bridges

• Component misalignment: components not placed correctly on the PCB

• Insufficient solder paste: can lead to incomplete solder joints or poor connections

ESD stands for Electrostatic Discharge. Its role is to prevent damage to electronic components.

• Preventing damage to electronic components

• Protecting sensitive equipment from electrostatic discharge

• Implementing ESD control measures in manufacturing facilities

• Training employees on ESD prevention techniques

Wi,Twi is a programming language used for statistical computing and graphics.

• Wi,Twi is a dialect of the R programming language.

• It is commonly used for data analysis, statistical modeling, and visualization.

• Wi,Twi has a large number of packages available for various statistical tasks.

• Some popular packages in Wi,Twi include ggplot2 for data visualization and dplyr for data manipulation.

7 QC tools are a set of basic statistical tools used for quality control and process improvement.

• Check sheet: Used to collect and organize data in a structured format.

• Histogram: Represents data distribution visually to identify patterns and trends.

• Pareto chart: Helps prioritize issues by showing the most significant factors affecting quality.

• Cause-and-effect diagram (Fishbone diagram): Identifies root causes of problem...read more