CCT - Certified Calibration Technician Tools & Equipment Operation 1

Question 1

When zeroing a micrometer before use, the thimble is closed against the anvil and a small discrepancy is noted on the barrel scale. What is the correct corrective action?

Accepted Answer

Clean the anvil and spindle faces, then recheck before adjusting

Answer

Dirt or debris on the contact faces is the most common cause of zero offset. Cleaning and rechecking first avoids unnecessary mechanical adjustment, which should only be performed if the error persists on clean surfaces.

Question 2

A calibration technician is using an electronic balance to weigh reference masses. The balance is level, warmed up, and recently calibrated, yet readings fluctuate by ±0.05 g. What is the most likely cause?

Accepted Answer

Air currents in the room are disturbing the balance pan

Answer

Electronic balances at high resolution are extremely sensitive to air movement. Even slight drafts from HVAC vents or nearby personnel can cause the displayed reading to fluctuate, requiring a draft shield to stabilize results.

Question 3

When performing a calibration with an autocollimator, the instrument must be aligned along the optical axis of the reflector. What happens if significant angular misalignment is present?

Accepted Answer

The reflected beam misses the reticle, producing no readable return signal

Answer

An autocollimator relies on a collimated beam being reflected back through the objective lens. Excessive angular misalignment causes the return beam to miss the internal detector or reticle entirely, resulting in no valid measurement output.

Question 4

A technician connects an oscilloscope probe to a calibration signal generator and observes a distorted waveform with significant ringing. The most likely corrective action is to:

Accepted Answer

Adjust the probe's compensation trimmer until the square wave edges are clean

Answer

Probe compensation adjusts the high-frequency response of the RC network in the probe tip to match the oscilloscope input impedance. Incorrect compensation causes overshoot, ringing, or rounded edges on square waves and must be corrected before any measurement.

Question 5

During pneumatic pressure calibration, a technician notices a slow, steady decline in the reference pressure reading while the system supply valve is closed. This observation most likely indicates:

Accepted Answer

There is a leak in the test circuit connections or tubing

Answer

A slow pressure decay with the supply isolated is a classic symptom of a leak in the circuit. Fittings, tubing, and adapters must be inspected and leak-tested before proceeding, as any leak invalidates the calibration results.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT - Certified Calibration Technician Tools & Equipment Operation 1