CET Data Quality & Completeness 3

Question 1

A technician evaluates a sensor's ability to detect the smallest meaningful change in the measured variable. This specification is called:

Accepted Answer

Resolution

Answer

Resolution is the smallest change in the measured quantity that produces a detectable change in the instrument's output.

Question 2

In digital communications, a CRC-16 generates a remainder of 0 upon checking received data. This indicates:

Accepted Answer

No errors were detected in the received data

Answer

A remainder of zero after CRC division means no errors were detected; however, CRC cannot guarantee absolute error-free data for all error patterns.

Question 3

Which term describes the closeness of agreement among repeated measurements of the same quantity under identical conditions?

Accepted Answer

Precision

Answer

Precision (or repeatability) refers to how closely repeated measurements agree with each other, independent of how close they are to the true value.

Question 4

An electronics technician finds that an oscilloscope probe has a 10:1 attenuation ratio. If the displayed voltage is 3.5 V, the actual circuit voltage is:

Accepted Answer

35 V

Answer

A 10:1 probe attenuates the signal by a factor of 10, so the actual voltage is the displayed value multiplied by 10 (3.5 × 10 = 35 V).

Question 5

What is the primary purpose of using a guard ring in a high-precision measurement circuit?

Accepted Answer

To reduce leakage currents that would corrupt high-resistance measurements

Answer

Guard rings intercept leakage currents from high-impedance nodes and return them to a driven guard voltage, preventing them from corrupting sensitive measurements.

(CET) Certified Electronics Technician Practice Test

(CET) Certified Electronics Technician Practice Test

CET Data Quality & Completeness 3