🔍 Key Concepts

• Electrical vs. mechanical pyrometers and how each senses temperature • What it means to indicate temperature at a remote or distant point • Typical uses of temperature instruments on engines and boilers

💭 Think About

• Ask yourself: Which feature would be especially useful if the hot surface or gas is in a dangerous or hard‑to‑reach location? • Consider whether an electrical signal from a sensor can be transmitted more easily than a mechanical movement (like expansion or a linkage). • Think about which option actually describes a general advantage of the instrument type itself, not just a special or unlikely mechanical add‑on.

✅ Before You Answer

• Identify which choice describes an advantage that clearly requires electrical transmission rather than direct mechanical motion. • Eliminate any options that talk about functions unrelated to temperature measurement (e.g., RPM) or not specific to electrical construction. • Focus on the option that describes using the pyrometer away from the heat source while still getting an accurate indication.