Description : A Doppler Radar operating at 15 GHz is viewing a target moving directly towards it at the speed of 25 m/s. The Doppler frequency shift
Last Answer : A Doppler Radar operating at 15 GHz is viewing a target moving directly towards it at the speed of 25 m/s. The Doppler frequency shift 2.5 KHz
Description : Can over use of the wifes fetal doppler radar harm the baby in any way?
Last Answer : answer:What is a fetal doppler radar? I have heard them in conjunction with tracking the weather, but not fetuses. Not an answer, sorry, but I am curious. and too lazy to google it
Description : For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is: (A) 130 km (B) 230 km (C) 250 km (D) 500 km
Last Answer : Answer: Option B
Description : The spectrum of a radar transmitter describes what characteristic of the output pulse?
Last Answer : Frequency distribution
Description : The Doppler method of object detection is best for what type objects?
Last Answer : Fast-moving targets.
Description : The Doppler effect causes a change in what aspect of rf energy that strikes a moving object?
Last Answer : Frequency.
Description : What characteristic of a gunn oscillator is inversely proportional to the transit time of the domain across the semiconductor?
Last Answer : The frequency.
Description : The kinetic energy of an electron is directly proportional to what property?
Last Answer : Velocity.
Description : Is the current flow through an inductor directly proportional or inversely proportional to its inductance value?
Last Answer : Directly proportional.
Description : Which is NOT a characteristic of emissivity? A. It is high with most nonmetals B. It is directly proportional to temperature C. It is independent with the surface condition of the material D. It is low with highly polished metals
Last Answer : It is independent with the surface condition of the material
Description : A sliding contact bearing is operating under stable condition. The pressure developed in oil film is p when the journal rotates at N rpm. The dynamic viscosity of lubricant is μ and effective coefficient of ... to p and f) (d) f is directly proportional to μ and inversely proportional to N
Last Answer : (b) f is directly proportional to μ and N
Description : Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to ... D. The coefficient of friction is inversely proportional to the force pressing the surfaces together
Last Answer : The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure
Description : The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to (A) N° (B) N 1 (C) N 2 (D) N 3
Last Answer : (C) N
Description : . What is the normal source of dry air for a radar system?
Last Answer : Ship's central dry-air system
Description : The peak power of a radar depends on the interrelationship of what other factors?
Last Answer : Average power, pulse width, and prt.
Description : The ideal radar spectrum has what relationship to the carrier frequency?
Last Answer : Symmetrical above and below the carrier frequency.
Description : Which of the two types of automatic gain control, agc or iagc, is most effective in radar use for the Navy?
Last Answer : IAGC.
Description : What IF frequencies are normally used in radar receivers
Last Answer : Thirty or sixty megahertz.
Description : What type of receiver is most often used in radar systems?
Last Answer : Superheterodyne.
Description : What type of modulator is most commonly used in modern radar systems?
Last Answer : Line-pulsed.
Description : In an externally synchronized radar, what determines the prr of the transmitter?
Last Answer : The master oscillator.
Description : What type of multivibrator can be used as a radar master oscillator?
Last Answer : Free-running.
Description : A self-synchronized radar system obtains timing trigger pulses from what source?
Last Answer : Transmitter.
Description : What is the purpose of the majority of circuits in a radar system?
Last Answer : Timing and control.
Description : What is the purpose of the synchronizer in a radar system?
Last Answer : Controls system operation and timing.
Description : Which of the two general classes of antennas is most often used with radar?
Last Answer : Directional.
Description : What radar scope uses a range step for range measurement?
Last Answer : The A scope.
Description : Range-marker generators produce pulses based on what radar constant?
Last Answer : The radar mile (12.36 microseconds).
Description : What type of ranging circuit is most often used with a radar that requires extremely accurate range data?
Last Answer : Range gate or range step.
Description : What are the required radar inputs for proper indicator operation?
Last Answer : Triggers, video, and antenna information.
Description : What are the three fundamental quantities involved in radar displays?
Last Answer : Range, bearing, and elevation.
Description : Which beam of missile-guidance radar is very wide?
Last Answer : Capture beam.
Description : What width is the pulse radiated by fire-control tracking radar?
Last Answer : Very narrow.
Description : Tracking radar searches a small volume of space during which phase of operation?
Last Answer : Acquisition.
Description : Fire-control tracking radar most often radiates what type of beam?
Last Answer : A narrow circular beam.
Description : Why is the range capability of 3D radar usually less than the range of 2D radar?
Last Answer : Higher operating frequency
Description : What position data are supplied by 2D search radar?
Last Answer : Range and bearing.
Description : Air-search radar is divided into what two basic categories?
Last Answer : 2D and 3D.
Description : What is the shape of the beam of a surface-search radar?
Last Answer : Wide vertically, narrow horizontally.
Description : What limits the maximum range of a surface-search radar?
Last Answer : Radar horizon.
Description : A surface-search radar normally scans how many degrees of azimuth?
Last Answer : 360 degrees.
Description : Radar altimeters use what type of transmission signal?
Last Answer : Frequency modulated (fm).
Description : What type of radar provides continuous range, bearing, and elevation data on an object?
Last Answer : Track radar.
Description : What radar component permits the use of a single antenna for both transmitting and receiving?
Last Answer : Duplexer.
Description : What radar subsystem supplies timing signals to coordinate the operation of the complete system?
Last Answer : Synchronizer.
Description : The degree of bearing resolution for a given radar system depends on what two factors?
Last Answer : Beam width and range.
Description : What term is used to describe the ability of a radar system to distinguish between targets that are close together?
Last Answer : Target resolution
Description : What type of radar detects range, bearing, and height?
Last Answer : Three-dimensional.
Description : What type of radar transmitter power is measured over a period of time?
Last Answer : Average power.