California Alarm Company Operator Licensing Practice Exam

Which surface is described as best for mounting a photoelectric device?

Wood Plastic Glass Metal

Correct Answer:

Metal

Explanation:

Mounting a photoelectric device requires a surface that stays absolutely stable so the emitted beam remains precisely aimed. The device’s transmitter and receiver must stay in exact alignment; any movement, flexing, or vibration can cause misalignment, leading to unreliable detection or false alarms. Metal provides the most rigid, durable mounting surface, resisting warping, bending, or significant changes with temperature. Screws grip metal securely, giving a solid anchor that stays put over time. Wood can warp or crack with humidity; plastic can creep or deform under load; glass is brittle and can crack if tightened or bumped. So metal best preserves alignment and reliability for the sensor.

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