ATT ET test 10
What is RF energy reflected from an object called? - Answer-Echo
What does the RF energy reflected from an object provide to the radar system? - Answer-Bearing, range,
elevation and velocity
In order for the radar system to distinguish between two objects at the same range, the objects must be
separated by at least ________? - Answer-One beam width
The length of the LOS line is called? - Answer-Range
The reference level in the decibel measurement system for radar is? - Answer-1 milliwatt
The primary factor affecting radar accuracy is? - Answer-Radar system resolution
Which radar component converts the IF pulses to video pulses? - Answer-Video detector
What type of receiver is most often used in radar systems? - Answer-Super heterodyne
What radar receiver circuit actually produces the IF frequency - Answer-Mixer (first detector)
What is the greatest limiting factor in a receivers maximum detectable range? - Answer-Noise
,Signal loss due to high frequency currents flowing near the outer surface of the conductor is called? -
Answer-Skin effect
When a portion of electric energy is lost to the atmosphere and not to a nearby object it is called? -
Answer-Radiation loss
What is characteristic impedance? - Answer-Distributed inductance and capacitance of the line
Signal loss due to the resistance in long transmission lines is called? - Answer-Copper loss
A waveguide is defined as? - Answer-A system of material boundaries, capable of guiding
electromagnetic energy
Electromagnetic energy is produced by? - Answer-Current flowing through a conductor
The physical handling and installation of waveguides is called? - Answer-Plumbing
Which dimension determines the power handling capability of a waveguide? - Answer-"b"
An antennas power gain is measured by comparing it to? - Answer-A reference antenna
The ability of an antenna to act as a transmitter or receiver antenna is called? - Answer-Reciprocity
A truncated parabolic antenna is normally used in what type of microwave system? - Answer-Radar
, To determine the bearing of an object, a radar system would use an antenna that has a? - Answer-
Narrow horizontal beam width
Adding a reflector to a horn antenna will? - Answer-Increase power gain and directivity
What type of jammer transits constant amplitude, constant frequency, and unmodulated jamming
signals to change the signal-to-noise ratio of a radar receiver? - Answer-CW
What type of jammer generates RF noise in a particular band or frequency channel to change the signal-
to-noise ratio of a radar receiver? - Answer-Spot noise
Active ECM is sometimes referred to as? - Answer-Jamming
What methods are employed to combat ECM? - Answer-ECCM (electronic counter-countermeasures)
Dry air is used in waveguides to prevent? - Answer-Arcing
What are the operational pressures of high and low power dry air systems? - Answer-25-35 PSI high and
1-8 PSI low
A type 1 dehydrator uses? - Answer-refrigerant to remove liquid and oil
Why are some equipment enclosures hermetically sealed? - Answer-to prevent the entrance of moisture
The least efficient type of equipment cooling is? - Answer-Convection
What is RF energy reflected from an object called? - Answer-Echo
What does the RF energy reflected from an object provide to the radar system? - Answer-Bearing, range,
elevation and velocity
In order for the radar system to distinguish between two objects at the same range, the objects must be
separated by at least ________? - Answer-One beam width
The length of the LOS line is called? - Answer-Range
The reference level in the decibel measurement system for radar is? - Answer-1 milliwatt
The primary factor affecting radar accuracy is? - Answer-Radar system resolution
Which radar component converts the IF pulses to video pulses? - Answer-Video detector
What type of receiver is most often used in radar systems? - Answer-Super heterodyne
What radar receiver circuit actually produces the IF frequency - Answer-Mixer (first detector)
What is the greatest limiting factor in a receivers maximum detectable range? - Answer-Noise
,Signal loss due to high frequency currents flowing near the outer surface of the conductor is called? -
Answer-Skin effect
When a portion of electric energy is lost to the atmosphere and not to a nearby object it is called? -
Answer-Radiation loss
What is characteristic impedance? - Answer-Distributed inductance and capacitance of the line
Signal loss due to the resistance in long transmission lines is called? - Answer-Copper loss
A waveguide is defined as? - Answer-A system of material boundaries, capable of guiding
electromagnetic energy
Electromagnetic energy is produced by? - Answer-Current flowing through a conductor
The physical handling and installation of waveguides is called? - Answer-Plumbing
Which dimension determines the power handling capability of a waveguide? - Answer-"b"
An antennas power gain is measured by comparing it to? - Answer-A reference antenna
The ability of an antenna to act as a transmitter or receiver antenna is called? - Answer-Reciprocity
A truncated parabolic antenna is normally used in what type of microwave system? - Answer-Radar
, To determine the bearing of an object, a radar system would use an antenna that has a? - Answer-
Narrow horizontal beam width
Adding a reflector to a horn antenna will? - Answer-Increase power gain and directivity
What type of jammer transits constant amplitude, constant frequency, and unmodulated jamming
signals to change the signal-to-noise ratio of a radar receiver? - Answer-CW
What type of jammer generates RF noise in a particular band or frequency channel to change the signal-
to-noise ratio of a radar receiver? - Answer-Spot noise
Active ECM is sometimes referred to as? - Answer-Jamming
What methods are employed to combat ECM? - Answer-ECCM (electronic counter-countermeasures)
Dry air is used in waveguides to prevent? - Answer-Arcing
What are the operational pressures of high and low power dry air systems? - Answer-25-35 PSI high and
1-8 PSI low
A type 1 dehydrator uses? - Answer-refrigerant to remove liquid and oil
Why are some equipment enclosures hermetically sealed? - Answer-to prevent the entrance of moisture
The least efficient type of equipment cooling is? - Answer-Convection
