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2nd sem (2nd year) > RADAR (PRELIM) > Flashcards

RADAR (PRELIM) Flashcards

1
Q

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

A

A. Reduced

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2
Q

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

A

B. Alphanumeric data

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3
Q

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

A

A) Radio Detection and Ranging

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4
Q

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

A

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

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5
Q

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

A

A. OOW

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6
Q
  1. 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
A

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

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7
Q

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

A

C. 186,000 miles/second

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8
Q

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

A

C. High frequency

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9
Q

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

A

B. Radio waves

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10
Q

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

A

B. An Echo

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11
Q

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

A

A. Echo Trail

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12
Q

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

A

C. PPI

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13
Q

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

A

C. Transmitter

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14
Q
  1. 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
A

B. Direction

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15
Q

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

A
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16
Q

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

A

C) Both other ships and land obstacles

17
Q

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

A

B) To calculate the range and bearing of targets

18
Q

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

A
19
Q

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

A
20
Q

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

A

A. Gain

21
Q

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

A

A. During a lot of targets

22
Q

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

A

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

23
Q

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

A

B) By differentiating between targets to avoid confusion

24
Q

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

A

B..250 miles

25
Q

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

A

A. One

26
Q

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

A

B. Frequency

27
Q

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

A

D. Head up/ relative motion / relative vector

28
Q

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

A

B. history

29
Q

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

A

D. past position

30
Q

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

A

B. interscan

31
Q

Give the 10 Uses of Marine Radar

A
  • 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
32
Q

What is the primary function of radar in maritime navigation?

A

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

33
Q

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

A

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.

34
Q

What role does ARPA play in collision avoidance?

A

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

35
Q

How does radar contribute to weather monitoring in maritime operations?

A

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

36
Q

In what ways does ARPA integrate with other navigational systems?

A

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.

2nd sem (2nd year) (9 decks)

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