1N051 Unit 4
Unit 4 Review
- 1.
__ is simply an emission of EM radiation in the form of anything from a radio wave to gamma rays
- A.
The electromagnetic spectrum
- B.
A waveform
- C.
Radiation
- D.
A signal
Correct Answer
D. A signal -
- 2.
__ EM energy behaves in __ manner
- A.
Most/similar
- B.
Most/same
- C.
All/similar
- D.
All/same
Correct Answer
D. All/same -
- 3.
__ is the title given to all types of radiation when referred to as a whole
- A.
The EM spectrum
- B.
The radiation continuum
- C.
The visible spectrum
- D.
Radio frequency
Correct Answer
A. The EM spectrum -
- 4.
__ is energy that spreads out as it travels away from its source
- A.
Electromagnetic energy
- B.
The visible spectrum
- C.
Cosmic rays
- D.
Radiation
Correct Answer
D. Radiation -
- 5.
The EM spectrum is divided into regions also known as __
- A.
Wavelengths
- B.
Frequencies
- C.
Spectrums
- D.
Bands
Correct Answer
D. Bands -
- 6.
__ fall within the visible region of the EM spectrum
- A.
Cosmic rays, gamma rays, x-rays, ultraviolet (UV)
- B.
Ultra high frequency, ultraviolet, and infrared
- C.
Infrared, ultraviolet, and very low frequency
- D.
Cosmic ray, gamma ray, and infrared
Correct Answer
D. Cosmic ray, gamma ray, and infrared -
- 7.
__ is not part of the RF spectrum
- A.
Very low frequency
- B.
High frequency
- C.
Low frequency
- D.
Gamma ray
Correct Answer
D. Gamma ray -
- 8.
Which region of the electromagnetic spectrum falls between the frequencies of 1 Mhz and 300 Mhz
- A.
Extremely low frequency
- B.
Super high frequency
- C.
Very high frequency
- D.
Ultra high frequency
Correct Answer
C. Very high frequency -
- 9.
Which region of the electromagnetic spectrum falls between the frequencies of 300 Mhz-3000 Mhz
- A.
Extremely low frequency
- B.
Super high frequency
- C.
Very high frequency
- D.
Ultra high frequency
Correct Answer
D. Ultra high frequency -
- 10.
Which region of the electromagnetic spectrum falls between the frequencies of 3000 Mhz-6000 Mhz
- A.
Extremely low frequency
- B.
Super high frequency
- C.
Very high frequency
- D.
Ultra high frequency
Correct Answer
B. Super high frequency -
- 11.
Which type of radiant energy travels in all directions from its source and is similar to waves emanating from a pebble dropped in a pond
- A.
Infrared
- B.
Radiation
- C.
Radio
- D.
Light
Correct Answer
D. Light -
- 12.
__ is the distance a wave travels during one complete rotation and determines the energy's form and is used to graphically display it as bands on the EM spectrum
- A.
Wavelength
- B.
Frequency
- C.
Spectrum
- D.
Exclusion
Correct Answer
A. Wavelength -
- 13.
__ allows scientists to design and build sensors that detect EM energy from one region of the spectrum while excluding others
- A.
Wavelength
- B.
Frequency
- C.
Spectrum
- D.
Exclusion
Correct Answer
A. Wavelength -
- 14.
__ is actually a continuum of energy, ranging from very short wavelengths (gamma rays) to very long wavelengths (radio waves)
- A.
The electromagnetic spectrum
- B.
The electromagnetic timeline
- C.
The electromagnetic theory
- D.
Radar theory
Correct Answer
A. The electromagnetic spectrum -
- 15.
RADAR is an acronym for __
- A.
Radio detection and reflection
- B.
Radio deflection and reflection
- C.
Radio detection and ranging
- D.
Radar detection and ranging
Correct Answer
C. Radio detection and ranging -
- 16.
Radar is an __ system because it transmits bursts of microwave energy
- A.
Synthetic aperature
- B.
Semi-active
- C.
Passive
- D.
Active
Correct Answer
D. Active -
- 17.
What are the radar signal characteristics determined by the radar transmitter?
- A.
Pulse width, pulse recurrence integer, pulse repetition frequency, and wavelength
- B.
Pulse width, pulse recurrence time, pulse repetition frequency, and frequency
- C.
Pulse duration, pulse recurrence time, pulse repetition frequency, and power
- D.
Pulse width, pulse recurrence time, pulse repetition frequency, and power
Correct Answer
D. Pulse width, pulse recurrence time, pulse repetition frequency, and power -
- 18.
__ radar transmitter produces a RF signal with __ characteristics that differentiate it from all other signals
- A.
Every/specific
- B.
Some/specific
- C.
Every/identical
- D.
Some/identical
Correct Answer
A. Every/specific -
- 19.
The concept of __ based on the line of sight (LOS) principle where the object must be visible to radar
- A.
Radar energy is reflected by natural and cultural features
- B.
Angle of reflection equals the angle of incidence
- C.
Radar energy travels at a constant velocity
- D.
Radar energy travels in a straight line
Correct Answer
D. Radar energy travels in a straight line -
- 20.
When the radar's LOS is obstructed, it creates what is known as a __, which is displayed on radarscope.
- A.
Radar shadow
- B.
Radar blip
- C.
Target
- D.
Bogie
Correct Answer
A. Radar shadow -
- 21.
Urban reversal or frontal effect is created when structures __ to the radar source shield more __ structures and is significant when at low altitudes and flying over or near major cities
- A.
Perpendicular/parallel
- B.
Similar/operational
- C.
Closest/distant
- D.
Next/critical
Correct Answer
C. Closest/distant -
- 22.
__ occurs when a physical object, like a mountain, is positioned between the radar and the target
- A.
Radar shadow
- B.
Radar masking
- C.
Terrain masking
- D.
Geographical masking
Correct Answer
B. Radar masking -
- 23.
The measurement unit for radar speed is a __
- A.
Millisecond
- B.
Microsecond
- C.
Millimeter
- D.
Centimeter
Correct Answer
B. Microsecond -
- 24.
The __ is a constant equation built into the radar that allows us to determine the range of an object
- A.
Radar wavelength
- B.
Radar factor
- C.
Radar mile
- D.
Radar beam
Correct Answer
C. Radar mile -
- 25.
The reflected signal strength is directly __ to the reflecting object's density
- A.
Proportional
- B.
Relational
- C.
Inverse
- D.
Convex
Correct Answer
A. Proportional -
- 26.
Very hard materials __, while softer materials like wood and earth reflect less and absorb more
- A.
Reflect more and absorb more/reflect less absorb less
- B.
Reflect less and absorb more/reflect more and absorb less
- C.
Reflect more and absorb less/reflect less and absorb more
- D.
Reflect less and absorb less/reflect more and absorb more
Correct Answer
C. Reflect more and absorb less/reflect less and absorb more -
- 27.
When radar energy strikes an object at an angle that reflects away from the radar set, but reflects toward the radar set by yet another object it is called __
- A.
False positives
- B.
Duplicate reflection
- C.
Multiple reflections
- D.
RADAR deflection
Correct Answer
C. Multiple reflections -
- 28.
Typically, very long range/earely warning radars operate at __ frequencies (longer wavelengths) to increase detection range, while most target tracking radars operate at __ frequencies (smaller wavelengths) to increase target accuracy
- A.
Lower/higher
- B.
Higher/lower
- C.
Longer/shorter
- D.
Variable/fixed
Correct Answer
A. Lower/higher -
- 29.
__ is the number of times per second the RF energy compeltes one cycle and is measured as a hertz (Hz)
- A.
Pulse repetition frequency
- B.
Single frequency
- C.
Pulse repetition time
- D.
Pulse repetition interval
Correct Answer
B. Single frequency -
- 30.
__ is the rate at which pulses or pulse groups are transmitted expressed in Hz
- A.
Pulse repetition frequency
- B.
Single frequency
- C.
Pulse repetition time
- D.
Pulse repetition interval
Correct Answer
A. Pulse repetition frequency -
- 31.
__ is the time required for a complete transmission cycle, from the beginning of one pulse of RF energy to the beginning of the next measured in microseconds
- A.
Pulse repetition frequency
- B.
Single frequency
- C.
Pulse repetition time
- D.
Pulse repetition interval
Correct Answer
C. Pulse repetition time -
- 32.
__ is used in RWRs and other electronic warfare support (ES) assets to discriminate between radar systems
- A.
Pulse repetition frequency
- B.
Single frequency
- C.
Pulse repetition time
- D.
Pulse repetition interval
Correct Answer
D. Pulse repetition interval -
- 33.
__ is the power of the signal and can be expressed in peak and average
- A.
Amplitude
- B.
Average power
- C.
Wavelength
- D.
Peak power
Correct Answer
A. Amplitude -
- 34.
__ provides a better measure of a radar's detection range than does peak power
- A.
Amplitude
- B.
Average power
- C.
Wavelength
- D.
Peak power
Correct Answer
B. Average power -
- 35.
__ is the amplitude of an individual radar pulse, measured in watts or megawatts, and radiated when the transmitter is active
- A.
Amplitude
- B.
Average power
- C.
Wavelength
- D.
Peak power
Correct Answer
D. Peak power -
- 36.
Wavelength is a measure of the physical distance between peaks of a sine wave
- A.
Amplitude
- B.
Average power
- C.
Wavelength
- D.
Peak power
Correct Answer
C. Wavelength -
- 37.
The relationship between wavelength and frequency is __
- A.
Inverse
- B.
Proportional
- C.
Direct
- D.
Positive
Correct Answer
A. Inverse -
- 38.
__ is the amount of time that the radar radiates a single pulse
- A.
Pulse length
- B.
Pulse repetition time
- C.
Pulse width
- D.
Pulse signal
Correct Answer
C. Pulse width -
- 39.
Far from the main beam, is a point where the RF energy is only half as strong, known as the __
- A.
Half power point
- B.
Beam width
- C.
Beam edge
- D.
Half point
Correct Answer
A. Half power point -
- 40.
Beam width error (BWE) is always applied in a(n) direction
- A.
Tracking
- B.
General
- C.
Circular
- D.
Azimuth
Correct Answer
D. Azimuth -
- 41.
Beam width error (BWE) is an inherent error applied to __ radar systems only
- A.
Real-beam
- B.
Synthetic aperture radar
- C.
Early warning
- D.
Target track
Correct Answer
A. Real-beam -
- 42.
This is the direction of the target in relation to the radar's location
- A.
Azimuth
- B.
Range
- C.
Altitude
- D.
Velocity
Correct Answer
A. Azimuth -
- 43.
This is the distance a target is from the radar site at the time of detection. the term is usually expressed in nautical miles (nm)
- A.
Azimuth
- B.
Range
- C.
Altitude
- D.
Velocity
Correct Answer
B. Range -
- 44.
The height of a target is expressed by above ground level (AGL) or mean sea level (MSL)
- A.
Azimuth
- B.
Range
- C.
Altitude
- D.
Velocity
Correct Answer
C. Altitude -
- 45.
__ is the speed at which the target moves in relation to the radar system and is usually expressed in knots
- A.
Azimuth
- B.
Range
- C.
Altitude
- D.
Velocity
Correct Answer
D. Velocity -
- 46.
The most common type of radar is the __
- A.
Real-beam
- B.
Pulse radar
- C.
Phased array
- D.
Doppler
Correct Answer
B. Pulse radar -
- 47.
__ transmits discrete bursts of RF energy and detects range and azimuth
- A.
Real-beam
- B.
Pulse radar
- C.
Phased array
- D.
Doppler
Correct Answer
B. Pulse radar -
- 48.
The simple application of the __ provides a means for continous-wave radar to track a target
- A.
Doppler principle
- B.
RADAR effect
- C.
Parabolic equation
- D.
Parametric equation
Correct Answer
A. Doppler principle -
- 49.
For a doppler radar, compression happens if the signal returns at a __ frequeny, then the target is moving __ the radar
- A.
Lower/away from
- B.
Lower/towards
- C.
Higher/away from
- D.
Higher/towards
Correct Answer
D. Higher/towards -
- 50.
For a doppler radar, expansion happens if the signal returns at a __ frequency, then the target is moving __ the radar
- A.
Lower/away from
- B.
Lower/towards
- C.
Higher/away from
- D.
Higher/towards
Correct Answer
A. Lower/away from -
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