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Question

An industrial engineer wants to optimize a photoelectric switch system for detecting various packages on a conveyor belt, where the packages differ in shape, color, and surface reflectivity. Which of the following changes would most improve the switch's detection reliability for all package types?

This question was previously asked in
RRB NTPC 2025 Graduate Level CBT 1 Question Paper (25-Mar-2026) (Shift 3)
The correct answer is

Adjusting the sensor's sensitivity and alignment to account for target surface characteristics

To determine the best way to optimize a photoelectric switch system for detecting various packages on a conveyor belt, it's important to understand what factors influence the performance of such systems:

  1. Factors Influencing Detection: Photoelectric switches rely on optical components to detect objects, and their performance can be affected by factors such as the shape, color, and surface reflectivity of the packages being detected.
  2. Understanding Package Variability: Since the packages on the conveyor belt differ in these optical characteristics, it becomes crucial for the detection system to adapt accordingly for consistent and reliable performance.
  3. Correct Option Analysis: Let's analyze each of the options provided to find the most suitable solution:
    • Using a heavier sensor for mounting stability: While mounting stability is important, using a heavier sensor doesn't directly address detection reliability concerning varying package characteristics. Thus, this option is not ideal.
    • Increasing supply voltage to the sensor within rated limits: Increasing supply voltage could enhance the sensor’s range but doesn't specifically address issues related to the package's surface characteristics.
    • Adjusting the sensor's sensitivity and alignment to account for target surface characteristics: This option directly tackles the issue by modifying the sensor's operation to suit different package types. Adjusting sensitivity can help the sensor better detect packages with varying reflectivity and alignment adjustments can ensure correct targeting, thereby enhancing reliability.
    • Changing wire insulation material for better signal integrity: While better signal integrity is generally beneficial, it doesn't directly improve the detection of packages with different visual properties.

Based on the analysis above, the most effective change to improve the detection reliability for all package types is adjusting the sensor's sensitivity and alignment to account for target surface characteristics. This directly affects the sensor's ability to adapt to the varying reflective properties of different packages by tuning how the sensor perceives and responds to optical signals.

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