Which one of the following is not part of DFMD ?

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Which one of the following is not part of DFMD ?

Electronic Unit
Lead Curtain
Remote Control Unit
Cross Piece
This question was previously asked in
UPSC CISF-AC-EXE – 2020
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A Lead Curtain is not a standard component of a Door Frame Metal Detector (DFMD).
– DFMDs use electromagnetic fields to detect metallic objects as a person walks through the frame. Key components include the electronic unit (generating fields, processing signals), the frame structure (cross piece, side panels), and sometimes a remote control or interface.
– Lead curtains are used for shielding against X-rays, commonly found in X-ray baggage scanners to protect operators and the environment from radiation. They are not part of the metal detection principle.
Understanding the basic working principles of common security screening equipment helps differentiate their components. DFMDs rely on electromagnetism, while X-ray scanners rely on ionization radiation and require shielding materials like lead.

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