ARPA ver2 clean Questions with

NAEST Rev 1b - EM Waves, Radar & ARPA ver2 (clean) Questions with Correct Answers With more range and bearing information available, ARPA tracking window gets progressively

Select one:

• Smaller
• Bigger
• Stays the same in size
• circular - Correct Answer a

Radar horizon is larger than TH

Select one:

• 25%
• 20%
• 15%
• 10% - Correct Answer c

ARPA Operators are advised to allow approximately one minute of steady tracking before using the track data (course, speed, CPA, TCPA). - Correct Answer false The position of the target in the echo shape is along the centreline of the echo at the leading edge. - Correct Answer true Target swap of ARPA acquired targets can occur even when targets pass far away from each other. - Correct Answer false Own course and speed input error will affect the accuracy of the true vector. - Correct Answer true In accordance with Performance Standards adopted in December 2004 an ARPA must have how many alarm signals?

Select one:

• One 1 / 3

• Three
• Five
• Seven - Correct Answer b

Radar pulse amplitude causes error in range and bearing of targets. - Correct Answer true RM display

Select one:

• Shows tgts moving along a relative LOA
• Co & Spd of any tgt obtained by plotting
• Is Used for Coll Avoidance
• All options apply - Correct Answer d

After offset and set of radar picture, trails should be available in

Select one:

• 2 sweeps
• 5 sweeps
• 10 sweeps
• 15 sweeps - Correct Answer a

ARPA operator alarms and alerts must Include

Select one:

• collision threat
• lost target
• zone or minimum range
• all of above - Correct Answer d

Noise

Select one:

• is caused by electrons in a circuit
• shows up on screen like specs on screen 2 / 3

• weak targets can get swamped if settings are not correct
• Any of above - Correct Answer d

Target swap may happen when a tracked target enters a clutter area. - Correct Answer true EM field moves between WG covers by

Select one:

• Reflection
• Refraction
• Diffraction
• Super refraction - Correct Answer a

Rain clutter control

Select one:

• Narrows the HBW & VBW
• Reduces echo size on entire screen
• Both of above
• None of above - Correct Answer b

Whether the ARPA is sea or ground stabilized; will have no effect on CPA or TCPA. - Correct Answer true Target characteristics that influence echo shape

Select one:

• Surface texture
• Aspect
• Material
• All of above - Correct Answer d

It is possible for observers to confuse between True/Relative Motion presentation being used. - Correct Answer true

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