Which one of the following pressure gauges is most accurate device and is used for precision work and calibrating other pressure gauges?
- ADeadweight pressure gaugeCorrect
- BDiaphragm pressure gauge
- CBourdon tube pressure gauge
- DVacuum pressure gauge
Solution
Concept
Deadweight tester
Step-by-step solution
1. A deadweight gauge applies known weights over a piston of known area, giving an exactly known pressure. 2. It is therefore the primary standard for calibrating other gauges.
Explanation
Deadweight testers are used in laboratories to calibrate other pressure gauges.
Why the other options are wrong
Diaphragm and Bourdon tube gauges are common industrial gauges, and vacuum gauges measure pressure below atmospheric.
Shortcut
Calibration standard = deadweight tester.
Common mistake
Choosing the Bourdon gauge.
Correct answer: A) Deadweight pressure gauge