Correct Answer - Option 2 : Bourden pressure gage
(i) Mechanical gauges are those pressure measuring devices, which embody an elastic elemeant, which deflects under the action of the applied pressure P and this movement after being (mechanically magnified), operates a pointer moving against a graduated circumferential scale.
(ii) Generally, these gauges are used for measuring high pressure and where high precision is not required.
(iii) Following are the types of mechanical gauges:
- Bourdon Tube Pressure Gauge
- Diaphragm Pressure Gauge
- Bellows Pressure Gauge
- Dead-weight Pressure Gauge