CCT Tools & Equipment Operation 5

Question 1

A calibration lab receives a flow meter that uses a turbine rotor. Which calibration method provides the most accurate volumetric flow reference?

Accepted Answer

Gravimetric method using a weigh tank and timer

Answer

The gravimetric method—collecting fluid into a weigh tank over a timed interval—provides a primary-level flow reference by directly measuring mass and time.

Question 2

When using a coordinate measuring machine (CMM) to calibrate a precision fixture, the stylus qualification step is performed to:

Accepted Answer

Determine the exact center and effective radius of the stylus ball

Answer

Stylus qualification (probing a reference sphere) determines the stylus ball's effective center position and radius, which the CMM software uses to correct all subsequent measurements.

Question 3

A spectrum analyzer is used during RF power amplifier calibration. The instrument's resolution bandwidth (RBW) setting primarily affects:

Accepted Answer

The ability to resolve closely spaced signals and the noise floor

Answer

Narrower RBW improves frequency resolution between adjacent signals and lowers the displayed noise floor, while wider RBW speeds sweep time but reduces selectivity.

Question 4

Which technique is used to verify the linearity of a torque sensor over its full measurement range during calibration?

Accepted Answer

Apply certified torque at multiple ascending points and calculate deviation from best-fit line

Answer

Linearity is evaluated by applying known torques at multiple points across the range and comparing the actual output to the ideal straight-line response.

Question 5

A precision resistance standard is kept in a temperature-controlled oil bath during calibration. The primary reason for this practice is:

Accepted Answer

To reduce the effect of temperature coefficient of resistance on the standard's value

Answer

Precision resistance standards have temperature coefficients that cause their resistance to change with temperature; oil bath control minimizes this variation during calibration.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT Tools & Equipment Operation 5