🔍 Key Concepts
• Review how a normally open (NO) contact is drawn versus a normally closed (NC) contact in standard control schematics.
• Recall that a limit switch is a mechanically actuated switch (cam, lever, or plunger operated), and its symbol usually shows some kind of mechanical actuator next to the contact.
• Look at which symbols show a plain contact versus a contact that is position‑sensing / cam‑operated, and note which of those is drawn in the open position.
💭 Think About
• Among choices 5, 7, 12, and 13, first eliminate any symbol that clearly is not a contact (for example, one that looks like a heater or resistor rather than a switch).
• Of the remaining symbols that are contacts, decide which are simple NO contacts (like a basic pushbutton) and which show an actuating lever or cam that would make it a limit switch.
• Check which of those limit‑type symbols is drawn with the contacts separated (open) in the normal, unoperated position.
✅ Before You Answer
• Make sure the symbol you choose actually represents switch contacts, not a heater, resistor, or other device.
• Confirm that the contact is normally open – the line should be broken in the rest position, not touching.
• Verify that there is some indication of mechanical actuation (a lever, cam, or similar marking) to distinguish it as a limit switch, not just a regular NO pushbutton.