Question 1
What physical principle does an Acoustic Doppler Current Profiler (ADCP) use to measure water velocity?
Correct Answer:
Doppler frequency shift of acoustic pulses reflected by scatterers
Question 2
Which ADCP blanking distance parameter defines the zone nearest the transducer where velocity data cannot be reliably collected?
Correct Answer:
Blank before transmit
Question 3
A moving-vessel ADCP discharge measurement uses bottom tracking primarily to:
Correct Answer:
Reference vessel velocity so water velocity can be isolated
Question 4
In an ADCP measurement, what does the term 'ensemble' refer to?
Correct Answer:
The average of multiple pings collected over a short interval
Question 5
Which four-beam Janus transducer configuration is most commonly used in ADCP instruments to resolve three-dimensional velocity components?
Correct Answer:
Beams angled at 20° from vertical in opposing pairs
Question 1
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About this Exam

Prepare with the NSPS-THSOA Certified Hydrographer (CH) practice quiz. This question bank includes 160 questions covering data, adcp, velocity, hydrographic, and conservation. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NSPS-THSOA Certified Hydrographer (CH)

This practice set contains 160 questions from the matching question bank and focuses on data, adcp, velocity, hydrographic, and conservation. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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