Which of the following direct reading...

🔍 Key Concepts

• How different types of pressure gauges operate (single pressure, dual pressure, positive vs negative) • The meaning of positive pressure (above atmospheric) and negative pressure (vacuum/below atmospheric) • Which gauge types are typically used on systems where you must see vacuum on one side of zero and pressure on the other

💭 Think About

• Which type of gauge scale must cross through zero so it can indicate both vacuum (negative) and pressure (positive) on the same dial? • Does a differential, duplex, or simplex gauge necessarily show readings on both sides of atmospheric pressure, or do they usually show separate pressures or a difference between them? • Think about boiler and pump systems: which gauge is commonly used to see suction (vacuum) and discharge (pressure) on a single pointer and dial?

✅ Before You Answer

• Identify which term specifically implies a gauge that reads pressure relative to atmospheric, on both sides of zero • Confirm which gauge name is commonly associated with boiler service for showing vacuum and pressure on the same dial • Eliminate any gauges that read two separate pressures or the difference between two pressures rather than a single pressure that can be either positive or negative

Which of the following direct reading pressure gauges is capable of measuring and displaying both positive and negative pressures?

Compound gauge

Differential pressure gauge

Duplex gauge

Simplex gauge

🔍 Key Concepts

💭 Think About

✅ Before You Answer