Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty loader's wiring diagram shows a 'normally open' (N.O.) pressure switch in series with a warning lamp circuit. How does this switch operate to illuminate the lamp when pressure drops below a critical level?
A normally open (N.O.) switch is open (no continuity) in its de-energized or 'normal' state. In a pressure switch designed to warn of low pressure, 'normal' hig
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Question: A heavy-duty loader's wiring diagram shows a 'normally open' (N.O.) pressure switch in series with a warning lamp circuit. How does this switch operate to illuminate the lamp when pressure drops below a critical level?
Answer options: ✅ The switch closes when pressure drops, completing the circuit.
- The switch opens when pressure drops, breaking the circuit.
- The switch closes when pressure rises, completing the circuit.
- The switch opens when pressure rises, breaking the circuit.
Correct answer: The switch closes when pressure drops, completing the circuit.
Explanation: A normally open (N.O.) switch is open (no continuity) in its de-energized or 'normal' state. In a pressure switch designed to warn of low pressure, 'normal' high pressure keeps the switch open. When pressure drops below the critical level, the switch changes state and closes, completing the circuit to illuminate the warning lamp. If it were to open when pressure drops, the lamp would not illuminate.
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