CTC Data Acquisition and Validation 2

Question 1

Which type of transducer converts mechanical strain into an electrical signal for data acquisition?

Accepted Answer

Strain gauge

Answer

A strain gauge changes electrical resistance proportional to the mechanical deformation applied to it.

Question 2

What is the primary purpose of anti-aliasing filters in a data acquisition system?

Accepted Answer

Remove frequencies above the Nyquist limit before sampling

Answer

Anti-aliasing filters attenuate signal components above half the sample rate to prevent aliasing artifacts in the digitized data.

Question 3

A PCM (Pulse Code Modulation) stream is used in flight test telemetry primarily to:

Accepted Answer

Multiplex multiple analog channels into a single digital bit stream

Answer

PCM time-division multiplexing encodes multiple channels sequentially into one digital stream for efficient telemetry transmission.

Question 4

Which validation technique compares measured data against a known reference standard to confirm sensor accuracy?

Accepted Answer

Calibration check

Answer

Calibration checks verify that sensor output matches a known reference standard within specified accuracy tolerances.

Question 5

In flight test data acquisition, 'frame synchronization' refers to:

Accepted Answer

Identifying the correct starting point of a PCM frame in the bit stream

Answer

Frame synchronization detects the unique sync word pattern that marks the beginning of each PCM data frame.

(CTC) Certified Test Conductor Practice Test