🔍 Key Concepts

• Identify what physical quantity device F is sensing or controlling (pressure, temperature, flow, or purely mechanical position). • Match the style of actuator in device F (lever/shaft) with the added symbol on the switch contact (circle, triangle, etc.). • Notice which symbols (1, 3, 6, 8) show a single-pole switch versus a more complex, multi-contact switch.

💭 Think About

• Is device F operated by a process variable (like pressure or flow) or by direct mechanical/hand movement on a shaft? • Among symbols 1, 3, 6, and 8, which one represents a simple switch with a mechanical actuator, rather than a diaphragm, float, or flow/pressure element? • Does any choice show extra internal parts (like multiple steps or stages) that do not appear in the simple construction of device F?

✅ Before You Answer

• Confirm whether device F has any sensing bulb, bellows, diaphragm, or paddle; if not, rule out symbols that clearly represent those features. • Verify which of the candidate symbols shows only one moving contact and one fixed contact, like a basic lever-operated limit switch. • Make sure the extra shape attached to the switch (circle, triangle, etc.) correctly represents the kind of actuator you see on the shaft of device F.