1N051 Unit 4
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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
- 2.__ EM energy behaves in __ manner
- A.
Most/similar
- B.
Most/same
- C.
All/similar
- 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
- 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
- 5.The EM spectrum is divided into regions also known as __
- A.
Wavelengths
- B.
Frequencies
- C.
Spectrums
- 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
- 7.__ is not part of the RF spectrum
- A.
Very low frequency
- B.
High frequency
- C.
Low frequency
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 16.Radar is an __ system because it transmits bursts of microwave energy
- A.
Synthetic aperature
- B.
Semi-active
- C.
Passive
- 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
- 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
- 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
- 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
- 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
- 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
- 23.The measurement unit for radar speed is a __
- A.
Millisecond
- B.
Microsecond
- C.
Millimeter
- D.
Centimeter
- 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
- 25.The reflected signal strength is directly __ to the reflecting object's density
- A.
Proportional
- B.
Relational
- C.
Inverse
- D.
Convex
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
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