CET Data Quality & Completeness 2

Question 1

In digital signal processing, which condition is required by the Nyquist-Shannon sampling theorem to prevent aliasing?

Accepted Answer

Sample rate must be at least twice the highest signal frequency

Answer

The Nyquist-Shannon theorem requires a sample rate of at least twice the highest frequency component to accurately reconstruct the signal.

Question 2

A technician notices that an ADC output consistently reads 5 LSBs higher than the true analog input. This is an example of:

Accepted Answer

Offset error

Answer

Offset error is a fixed, constant deviation between the actual ADC output and the ideal output across all input levels.

Question 3

Which data integrity check method appends a value to a data block so that the sum of all bytes equals a predetermined value?

Accepted Answer

Checksum

Answer

A checksum sums all bytes in a data block and appends the result (or its complement) so receivers can verify data integrity.

Question 4

When calibrating a measurement instrument, 'traceability' means:

Accepted Answer

Measurements can be related to national or international standards through an unbroken chain

Answer

Traceability means calibration results are linked through an unbroken chain of comparisons to recognized national or international measurement standards.

Question 5

A data acquisition system exhibits integral nonlinearity (INL). What does this indicate?

Accepted Answer

The actual transfer function deviates from the ideal straight line across the full input range

Answer

INL measures the maximum deviation of the actual ADC transfer function from the ideal straight line spanning the full input range.

(CET) Certified Electronics Technician Practice Test

(CET) Certified Electronics Technician Practice Test

CET Data Quality & Completeness 2