Weather Journeyman Cdc 1W051A Vol. 2 Weather Radar

Front 1

An electric current passing through a wire coiled around a metal bar that induces a magnetic field is called

Back 1

a dipole.

Front 2

Which wavelength is best for the detection of small water droplets?

Back 2

3 cm.

Front 3

Which wavelength would be best for the interrogating a large thunderstorm?

Back 3

5.4 cm.

Front 4

When choosing an operating wavelength for a RADAR, it is dependent upon the

Back 4

intended use.

Front 5

The number of cycles per given unit of time is called

Back 5

a wavelength.

Front 6

As electromagnetic waves are emitted from RADAR and travel through the atmosphere, some of their energy is lost. What is the loss of energy due to interaction with atmospheric phenomena called?

Back 6

Attenuation.

Front 7

The amount of time it takes the RADAR to transmit one pulse is the

Back 7

Pulse length.

Front 8

What decides the minimum range of the RADAR?

Back 8

Pulse length.

Front 9

Another term for a second-trip echo is

Back 9

range folding.

Front 10

How does the beam width vary with wavelength; how does it vary with the diameter of the antenna?

Back 10

Directly; inversely.

Front 11

The ability of the RADAR to distinguish between two targets at the same range but at approximately the same direction from the RADAR is called

Back 11

bearing resolution.

Front 12

The ability of a the RADAR to differentiate between two closely spaced targets at the same range and bearing but at different elevations depends on

Back 12

beam width.

Front 13

Range resolution depends on

Back 13

pulse length.

Front 14

Side lobes can cause

Back 14

ground clutter.

Front 15

Under which condition is anomalous propagation of the RADAR beam most likely to occur?

Back 15

During abnormal atmospheric conditions.

Front 16

Super-refraction is when the curvature of the RADAR beam is

Back 16

greater than the earth's curvature.

Front 17

An unusual straightening of the RADAR beam upward best defines

Back 17

sub-refraction.

Front 18

What does sub-refraction do?

Back 18

Reduces the maximum range of detection of low-level targets.

Front 19

Sub-refraction effects the RADAR's displayed height values by making display height values

Back 19

underestimated.

Front 20

When using weather RADAR to measure the intensity of precipitation, the presence of both liquid and frozen scatterers may

Back 20

decrease the accuracy of the measurement because the RADAR equation does not handle mixed precipitation.

Front 21

Computation of the equivalent reflectivity factor (Ze) depends on

Back 21

average returned power, range to target, and a set of factors called the "RADAR constant".

Front 22

While preforming a RADAR metwatch, the operator notices a storm that has increased from 40 to 43 dBZs at one elevation slice. The operator must assume the intensity of the storm has

Back 22

doubled.

Front 23

What will the 2.2 nm (resolution) reflectivity product display, when the values of the four consecutive 0.54 nm data bins are 23, 24, 30, and 26?

Back 23

30.

Front 24

The factor that allows a Doppler RADAR to remember the frequency of transmitted energy for later comparison to returning energy is

Back 24

RADAR coherency.

Front 25

The technique that RADAR uses to compare the frequency of each new pulse with that of the pulse immediately preceding it is know as

Back 25

pulse pair processing.

Front 26

The actual wind speed is determined if the flow of wind is

Back 26

parallel to the RADAR beam axis.

Front 27

What limits velocity detection in a Doppler RADAR?

Back 27

Wavelength.

Front 28

Which action is an effective means of decreasing velocity alaising?

Back 28

Increase the pulse repetition frequency.

Front 29

The Doppler dilemma is a tradeoff between

Back 29

range and velocity.

Front 30

The spectral slope of the Doppler spectrum of a large thunderstorm with hail appear

Back 30

broad and sharp.

Front 31

The spectrum width product is useful for the early detection of thunderstorm development because

Back 31

the detection of high spectrum widths may be indicative of currents present in a convective atmosphere.

Front 32

Widespread low spectrum width values with isolated areas of higher values is most likely indicative of

Back 32

embedded storms.

Front 33

The beam width of the WSD-88D is approximately

Back 33

1.0⁰.

Front 34

Processing of ground clutter an range unfolding are functions of the

Back 34

RADAR data acquisition.

Front 35

Base data is collected by the

Back 35

RADAR data acquisition.

Front 36

Two distinct properties common to most ground clutter are

Back 36

small spectrum width and near zero Doppler velocity.

Front 37

How many elevation slices does both VCP 31 VCP 32 (clear air mode) complete in ten minutes?

Back 37

Five.

Front 38

Control of the RADAR product generator is accomplished from a computer terminal known as what?

Back 38

RDA/RPG remote access terminal.

Front 39

The RADAR product generator uses what method to dealias velocity data before it is used by the meteorological algorithms?

Back 39

Elits dealiasing technique.

Front 40

The clear-air analysis task contains which two algorithms?

Back 40

Velocity azimuth display and velocity volume processing algorithms.

Front 41

The radar product generator provides

Back 41

alert processing.

Front 42

The workstation is the interface to which processors in the WSR-88D?

Back 42

Display and graphic processors.

Front 43

The primary interface used to request, control, and manipulate WSR-88D system products is the

Back 43

graphic tablet and puck.

Front 44

A principal user with dedicated communications to a WSR-88D unit is called

Back 44

an associated user.

Front 45

The two ways to select products from the principal user processor database are by using the

Back 45

graphic tablet and puck and through the applications terminal.

Front 46

Which procedure is not a way to request products on the principal user processor?

Back 46

Product-parameter selection list.

Front 47

A request for a product not on the current routine product set list is called

Back 47

a one-time product product request.

Front 48

Who determines the various alert thresholds for meteorological phenomena?

Back 48

Local unit RADAR committee.

Front 49

What are the different groups of alert thresholds?

Back 49

Volume group, forecast group, and grid group.

Front 50

Which archive levels are at the RADAR data acquisition?

Back 50

1 and 2.

Front 51

Which archive level is the most important and useful because it allows the total recreation of a weather scenario?

Back 51

Archive Level 2.

Front 52

Which archive level can only record those products being received at the principal user processor?

Back 52

Archive Level 4.

Front 53

The open principal user processor software concepts replaces the graphics tablet and puck because it uses

Back 53

Graphics user interface.

Front 54

The main difference between an open principal user processor (OPUP) used at an OWS and an OPUP used at a CWT is

Back 54

capability of the OPUP.

Front 55

Weather Flights that use an OPUP are limited when compared to an OPUP at an OWS because the WF has

Back 55

just one RDA.