RADAR (PRELIM)

Question 1

Performance Standard for an ARPA requires that it should the workload of observers by
enabling them to automatically obtain information so that they can perform as well with multiple targets as they can by manually plotting a single target.
A. Reduced
B. Explained
C. Develop
D. Implement

Answer 1

A. Reduced

Question 2

What should be displayed by an ARPA provided by the Radar display is accordance to performance
standard for navigational Radar equipment?
A. Specific data
B. Alphanumeric data
C. True motion data
D. Relative motion data

Answer 2

B. Alphanumeric data

Question 3

What does RADAR stand for in the context of marine navigation?
A) Radio Detection and Ranging
B) Radio Direction and Ranging
C) Radar Detection and Ranging
D) Radio Distance and Ranging

Answer 3

A) Radio Detection and Ranging

Question 4

What is the primary function of marine radar?
A) To measure water temperature
C) To communicate with other ships
B) To detect objects and their position relative to the vessel
D) To monitor weather conditions

Answer 4

B) To detect objects and their position relative to the vessel

Question 5

When a Radar/ARPA is installed, it should be under the control and care of whom?
A. OOW
B. Master
C. Pilot
D. Qualified person

Answer 5

A. OOW

Question 6

6. How does marine radar determine the distance to an object?
   A) By measuring the time it takes for a sound wave to return
   B) By calculating the speed of the vessel
   C) By sending out a radio signal and measuring the time it takes for the signal to return after hitting an object
   D) By using GPS coordinates

Answer 6

C) By sending out a radio signal and measuring the time it takes for the signal to return after hitting an object

Question 7

Radar produces radio waves and which travels at approximate speed of?
A. 128,000 miles / second
B. 168,000 miles/second
C. 186,000 miles/second D. 198,000 miles/second

Answer 7

C. 186,000 miles/second

Question 8

If the radar radio wave pulses has many crest it will have what kind of radio frequency?
A. Ultrasonic frequency
B. Low frequency
C. High frequency
D. Directional frequency

Answer 8

C. High frequency

Question 9

Both and light travel at the near-constant speed of 186,000 miles per second;
A. Echo
B. Radio waves
C. Frequency
D. Wavelength

Answer 9

B. Radio waves

Question 10

If the Radar send out radio signal which is the pulse, then it comes back to the processor
A. An image
B. An Echo
C. A data
D. An interference

Answer 10

B. An Echo

Question 11

One of the best features of marine radar is its ability to determine where you are in cohesion
you were a couple of minutes ago which is the
A. Echo Trail
B. Blind sector
C. Stern marker
D. Auto acquisition

Answer 11

A. Echo Trail

Question 12

The parabolic radar antenna transmits and receives electromagnetic waves; as far as a target
being displayed is concerned, that is basically the wave that bounced off a certain object that paints itself on the
A. Panel
B. Processor
C. PPI
D. Ecdis

Answer 12

C. PPI

Question 13

Measuring the amount of time required for a reflected echo return to the
will determine
the Radar range of a target?
A. Scanner
B. PP| scope
C. Transmitter
D. Magnetron

Answer 13

C. Transmitter

Question 14

14. When the reflected echo returns to the scanner from a certain ___ the bearing of the target
    will be determined.
    A. Distance
    B. Direction
    C. Angle
    D. Data

Answer 14

B. Direction

Question 15

What is the purpose of the “echo trail” feature in marine radar?
A) To display the weather forecast
B) To show the history of the vessel’s movements and help assess navigation
C) To communicate with other vessels
D) To measure the speed of the vessel

Question 16

What type of obstacles can marine radar help detect?
A) Only other ships
B) Only land obstacles
C) Both other ships and land obstacles
D Only floating debris

Answer 16

C) Both other ships and land obstacles

Question 17

What is one of the primary functions of ARPA in marine navigation?
A) To provide weather forecasts
B) To calculate the range and bearing of targets
C) To communicate with other vessels
D) To measure water depth

Answer 17

B) To calculate the range and bearing of targets

Question 18

If you acquire a target in a Radar-Arpa and it is a bit small, to enlarged it you must activate what
button?
A. Interference reject
B. Automatic acquisition
C. Long pulse
D. Tuning

Question 19

This is what you called electromagnetic waves motion which consist of crest and trough?
A. Wavelength
B. Frequency
C. Super refraction
D. Radio waves

Question 20

If you encounter a rough sea state and there is a clutter on your Radar-ARPA, what button will
you adjust to clear off the clutter which is acquired?
A. Gain
B. Sea clutter
C. Tuning
D. Rain clutter

Answer 20

A. Gain

Question 21

Where will an automatic acquisition be used during navigation?
A. During a lot of targets
B. Upon high seas or far from coastal areas
C. Near coastal areas
D. In traffic separation zone

Answer 21

A. During a lot of targets

Question 22

How does ARPA assist in collision avoidance?
A) By providing real-time weather updates
B) By integrating with other shipboard equipment to derive precise data
C) By automatically steering the vessel
D) By displaying only the nearest vessels

Answer 22

B) By integrating with other shipboard equipment to derive precise data

Question 23

In high traffic density areas, how does ARPA help mariners?
A) By reducing the speed of the vessel
B) By differentiating between targets to avoid confusion
C) By providing entertainment options
D) By limiting the number of vessels in the area

Answer 23

B) By differentiating between targets to avoid confusion

Question 24

If the Range rings has been set on a range of 1.5 miles, and has 6 fixed rings, what will be the
graduation of each rings?
A..125 miles
B..250 miles
C. 0.50 miles
C. 0.75 miles

Answer 24

B..250 miles

Question 25

The lowest value of the range rings in a Radar/ARP has how many rings? A. One B. Two C. Three D. Four

Answer 25

A. One

Question 26

The other way of measuring waves motion which indicates the number of crests that pass a fix of initial time? A. Wavelength B. Frequency C. True motion D. Radio waves

Answer 26

B. Frequency

Question 27

Which kind of presentation which is not likely to be used during Radar/ARPA monitoring? A. North up/ true motion/true vector B. Course up/ true motion/ true vector C. Course up / relative motion/ relative vector D. Head up/ relative motion / relative vector

Answer 27

D. Head up/ relative motion / relative vector

Question 28

It is the called the four equally time spaced past position of Radar/ ARPA? A. trails B. history C. wavelength D. echo

Answer 28

B. history

Question 29

The effect of inherent of errors is that, even for a target on a steady track, the plotted position do not form a perfectly _? A. path B. position C. straight line D. past position

Answer 29

D. past position

Question 30

When a target is first acquired, the computer will commence storing positions, obtaining. up a monitoring dated co ordinates each time the aerial sweeps across the target. What do you call the aerial sweep? A. monitoring B. interscan C. rate aiding D. gate

Answer 30

B. interscan

Question 31

Give the 10 Uses of Marine Radar

Answer 31

- To calculate range and bearing of a target and thereafter use the information to determine speed, course etc - Integration with other shipboard equipment (such as ECDIS) to derive precisedata - Navigating own vessel and her course with regard to collision avoidance - Fixing the ship's position using terrestrial objects such as lighthouses, buoys etc - Differentiating between targets in high traffic density areas - Determination of the weather, to an extent - Use by VTS in controlling coastal traffic - Usage of features such as parallel indexing to ensure safe navigation - Alleviating workload on the OW on the bridge - Used extensively in pilotage that covers the above aspects

Question 32

What is the primary function of radar in maritime navigation?

Answer 32

The primary function of radar in maritime navigation is to provide vessels with a means of detecting and tracking other ships, land masses, navigational aids, and potential obstacles. Radar helps navigators determine the range, bearing, and relative motion of these objects, thereby enabling them to maintain situational awareness, navigate safely, and avoid collisions at sea[1]. Additionally, radar plays a crucial role in navigating during periods of reduced visibility, such as fog or darkness, by allowing ships to "see" other objects in the vicinity that may not be visible to the naked eye

Question 33

How does ARPA enhance or improve the capabilities of traditional radar systems?

Answer 33

ARPA (Automatic Radar Plotting Aid) enhances the capabilities of traditional radar systems by automating target tracking and providing advanced collision avoidance functionalities. It automatically tracks and plots the movement of multiple targets, significantly improving situational awareness and reducing the workload for navigators. By leveraging computer technology, ARPA offers capabilities such as predicting future ship positions and assessing collision risks, which traditional radar systems lack.

Question 34

What role does ARPA play in collision avoidance?

Answer 34

ARPA presents the current situation and uses computer technology to predict future situations, assesses collision risks, and allows operators to visualize proposed maneuvers by their own ship. It tracks various parameters and functionalities to aid in collision avoidance. It helps reduce the risk of human error, enhances decision-making, and improves overall situational awareness on the bridge

Question 35

How does radar contribute to weather monitoring in maritime operations?

Answer 35

they are crucial for detecting and tracking weather patterns such as storms, fog, or adverse weather conditions that can pose risks to vessels at sea. The combination of radar data and meteorological information provides a comprehensive picture of the surrounding weather conditions, enabling vessels to adjust their course, speed, and operations accordingly to navigate safely through challenging weather scenarios

Question 36

In what ways does ARPA integrate with other navigational systems?

Answer 36

ARPA systems can be integrated with Electronic Chart Display and Information Systems (ECDIS) on the bridge, allowing digital data from the ARPA to be fed via NMEA connectors[1]. This integration enables electronic charts to be superimposed on the radar screen and acquired targets to be represented on electronic charts. Additionally, ARPA can also integrate with other systems like Automatic Identification System (AIS)[2], enhancing the overall navigational capability of the vessel.