Question

A dead weight tester is used widely for______.
1. Producing high pressures
2. Testing magnitude of the given weight
3. Calibration of other equipment
4. Accurate measurement of loads

Answer 1

Correct Answer - Option 3 : Calibration of other equipment

Explanation:

Deadweight tester:

• It is an instrument that calibrates pressure by determining the weight of force divided by the area the force is applied.
• It generates very precise pressures by means of calibrated weights placed on top of a hydraulic piston.
• It can measure the pressure exerted by gas or liquid and can also generate a test pressure for the calibration of numerous pressure instruments.
• We put the weight on the weight stand, which is to be calibrated, and further we applied pressure by moving piston, when applied pressure and reference weight(Pressure)is equal at this condition reference weight will be zero(Dead). Therefore, it is called dead weigh tester.

​Advantages:

• it is simple in construction and easy to use.
• It can be used to calibrate a wide range of pressure measuring devices.
• Fluid pressure can be easily varied by adding weights or by changing the piston-cylinder combination.

Limitations:

The accuracy of the deadweight tester is affected due to the friction between the piston and cylinder, and due to the uncertainty of the value of gravitational constant 'g'.