CCT Calibration Techniques & Procedures 2

Question 1

When calibrating a pressure gauge using a deadweight tester, the weights must be rotated slowly during the test primarily to:

Accepted Answer

Reduce friction effects in the piston-cylinder assembly

Answer

Rotating the weights minimizes piston friction, ensuring that the true hydraulic pressure equals the calculated weight force per unit area.

Question 2

A thermocouple calibration procedure requires measuring the reference junction temperature because:

Accepted Answer

The EMF output depends on the temperature difference between measuring and reference junctions

Answer

Thermocouple EMF is a function of the temperature differential; without knowing the reference (cold) junction temperature, the measured junction temperature cannot be accurately determined.

Question 3

During an as-found/as-left calibration record, the 'as-found' data is most critical for:

Accepted Answer

Determining whether the instrument drifted out of tolerance since the last calibration

Answer

As-found data captures the instrument's condition before adjustment, revealing drift and informing whether the calibration interval needs to be shortened.

Question 4

Which calibration technique applies multiple increasing then decreasing input values to characterize both hysteresis and repeatability?

Accepted Answer

Up-down (bi-directional) calibration

Answer

Bi-directional calibration applies inputs in ascending and then descending order, exposing hysteresis as the difference between up-scale and down-scale readings at the same nominal input.

Question 5

When calibrating a flow meter in situ, the preferred reference standard is often a master meter placed in series because:

Accepted Answer

Both meters experience identical flow conditions simultaneously

Answer

A master meter in series measures the same fluid at the same temperature, pressure, and flow rate, making direct comparison highly accurate without needing to replicate lab conditions.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT Calibration Techniques & Procedures 2