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NC RADAR Operator Final Exam: Questions and Answers, Exams of Law

A comprehensive set of questions and answers for a north carolina radar operator final exam. it covers topics such as wave nature of radio signals, doppler effect, radar operation, speed laws, and safety. The detailed q&a format is ideal for exam preparation and reinforces understanding of key concepts in radar technology and traffic law enforcement.

Typology: Exams

2024/2025

Available from 05/05/2025

LennieDavis
LennieDavis 🇺🇸

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NC RADAR OPERATOR FINAL EXAM 2025
QUESTIONS AND ANSWERS GRADED A+
To examine how reflected radio signals are changed by relative motion requires an
understanding of ___ those signals.
wave nature
The wave length is literally the physical distance, or length from the?
Beginning of the peak to the end of the valley
The number of waves transmitted in one second of time equals the?
Frequency
All radio waves have three distinguishable characteristics.
Signal speed, wave length, frequency
Every RADAR signal travels at the same speed, namely the?
Speed of light
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Download NC RADAR Operator Final Exam: Questions and Answers and more Exams Law in PDF only on Docsity!

NC RADAR OPERATOR FINAL EXAM 2025

QUESTIONS AND ANSWERS GRADED A+

To examine how reflected radio signals are changed by relative motion requires an understanding of ___ those signals.

wave nature

The wave length is literally the physical distance, or length from the?

Beginning of the peak to the end of the valley

The number of waves transmitted in one second of time equals the?

Frequency

All radio waves have three distinguishable characteristics.

Signal speed, wave length, frequency

Every RADAR signal travels at the same speed, namely the?

Speed of light

Both the transmitted and received RADAR signals ___ travel at that constant speed.

always

Most RADAR signals in North Carolina today have wave lengths of about ___ (between .35 and .33 inches).

4/5 centimeters

Police RADAR signals have frequencies of more than ___ waves per second?

10 billion

Which of the following have exactly the same meaning?

One hertz = one cycle = one wave per second

X-band radar signal is ___ gigahertz?

30 billion

The radar signal's speed stays the same, but its __ and __ both change.

wave length; frequency

Who was the Austrian physicist credited with having discovered that relative motion causes a signal's frequency to change?

Christian Johann Doppler

Doppler discovered that relative motion causes a signal's frequency to change by?

Studying sound waves

What state agency is charged with the responsibility of developing and implementing mandatory criminal justice training courses, including the speed measuring instrument operator training courses?

Criminal Justice Education and Training Standards Commission

Minimum hours required for RADAR operator course? Shall not exceed?

30 hours; shall not exceed 4 consecutive weeks

Minimum ratio of instructors per students?

1 instructor per 6 students

The trainee must demonstrate ___ percent competence in the setup, test for accuracy and operation of the RADAR.

100%

Maximum sign off time?

2 hours

Required amount of supervised field practice time?

12 hours within 90 days

RADAR operator re-certification training shall consist of a minimum of ___ and shall not exceed ___.

6 hours; 1 week

RADAR is only a?

Tool

We are primarily concerned with?

Speed enforcement

According to NHTSA, the percentage of fatal crashes that occur in a speed zone of ___ or less is about 15%, while 65% occur in a ___ speed zone.

40 mph; 55 mph

What do we expect to accomplish?

Improve effectiveness of speed enforcement through the proper and efficient use of speed measuring instruments.

The basic goal of all police work is?

Protect the lives and property of the public

One of the best known challenges to RADAR occurred where and when? Which resulted in the rejection of RADAR evidence in 80 speed cases.

Dade County, Florida in 1979

IACP

International Association of Chiefs of Police

In order for a RADAR speed-measuring device to be approved for use in North Carolina, the instrument must be on the IACP ___?

Consumer Products List

What has been the target in almost all successful challenges to RADAR?

Human error

How good is RADAR?

Only as good as you, the operator

4 times, 4 times, and 16 times

The braking distance at 40 mph is not twice the distance required at 20 mph, but?

4 times

According to Joseph Nathan's Famous Firsts, the very first traffic law in America was passed on June 12, 1652 in?

New Amsterdam (now New York)

Hartford, Connecticut speed regulation

Enacted in 1901, limited automobile speeds to 12 mph in the country and 8 mph in within the city limits.

Basic Speed Law

Law stating that you may not drive faster than is safe and prudent for existing conditions, regardless of posted speed limits.

Prima Facie

At first sight / glance

Absolute Speed Limits

Simply prohibit driving faster than a specified numeric speed.

What are the three North Carolina speed laws?

Absolute, posted limit, and basic speed law.

What are the two aspects of driver identification?

Officer must identify the driver at the time of the violation, and in court.

With the oil embargo of 1973, congress imposed a nationwide ___ MPH max speed in 1974?

55

55 mph was chosen because it is the?

Median energy efficiency speed

NHTSA and TSF in NC found that speed attributed to ___ percent of all highway deaths.

38.7% - 39%

A very substantial number approximately ___ percent of fatal crashes in North Carolina occur in local jurisdiction.

approximately 25%

RADAR is a simple concept; in that a radio beam is transmitted out at a certain frequency, strikes an object with ___, where the frequency is changed (increased or decreased) and reflected back to the antenna.

relative motion

The word "RADAR" is an acronym, an abbreviation of the phrase RAdio Detection And ___?

Ranging

The police radar provides us with the speed reading on a detected target but not the ___ to the target?

range

The range information provided may be expressed in?

Yards or feet

The radar's transmitted beam will travel ___ unless it is absorbed, reflected, refracted.

Infinitely

___ is generated by a transmitter, the antenna forms the energy into a beam and the energy is transmitted into space.

Radio frequency energy

The operation of the Radar's timing circuits are made possible by the fact that radio energy always travels at approximately?

186,000 miles per second

Both the transmitted and received Radar signals always travel at a ___ speed.

constant

The ___ of the relative motion determines exactly how much higher or lower the reflected signal will be.

speed

The key thing about the Doppler Principle is that the frequency change only happens when there is __ __ between the radar and the solid object.

relative motion

The angular effect is also known as?

Cosine effect

Relative motion will occur if?

  1. The RADAR stands still and the object moves:
  2. The object stands still and the RADAR moves; or
  3. If they are both moving, as long as they move at different speeds, or in different directions so that the distance between them changes.

A ___ radar will measure the true speed of an object only when that object is moving directly toward or directly away from the radar.

stationary

In order to minimize that stationary radar angular effect, we always want to keep the angle as ___ as possible.

small

When selecting a site to operate stationary radar, it should be as ___ as possible.

safe and close to the road

The closer we set up to the traveled portion of the road, the better control we have over the ___ ___.

angular effect

In NC, RADAR instruments operated in the stationary mode must be set up so the angle between the RADAR and the target vehicle is no greater than?

20 degrees

How we ___ , or ___ , the radar device will have an impact on the magnitude of the angular effect.

aim; point

If the vehicles tend to be widely separated, a ___ setting should be used.

longer range

In stationary radar the angular effect is always in whose favor?

Suspect

Depending on ___ of the object, its reflected signal may not be "seen" by the RADAR unit.

size, shape, speed, composition and exact location

If we are operating radar at locations where vehicles tend to travel clustered to one another, a relatively ___ setting should be used.

shorter range

If the vehicles tend to be widely separated, a ___ setting should be used.

longer range

The transmitter's antenna focuses most of the energy into a?

Cone-shaped beam

The narrowest-beam RADAR currently available is about?

9 degrees

A radar beam whose angle is 11 degrees will be more than ___ ft wide at a point 200 feet down the road.

38

A radar beam will be more than 57 ft wide at a point ___ ft away.

300

When we adjust RADAR's "range" we are actually adjusting the ___ of the radar receiver.

sensitivity

It is important to understand that a RADAR unit's range setting is?