Radar | Weather Radar

Question 1

Weather radar is only a ___ means

Answer 1

secondary

Question 2

The primary purpose of weather radar is to detect the sort of rainfall that would indicate ___

Answer 2

thunderstorms and turbulence

Question 3

WX radar is required on aircraft carrying more than _ PAX, under IFR or at night when there could be TS or other hazards along the route

Answer 3

9

Question 4

C Band is between __ and __ _Hz

Answer 4

4000 8000

Question 5

The C Band will illuminate storms ___ nearby precip a better

Answer 5

beyond

Question 6

X Band is between ___ and ___ _Hz

Answer 6

8000 12,500 MHz

Question 7

X band provides __ resolution, though the higher frequencies are subject to scattering and absorption from ___ raindrops

Answer 7

better small

Question 8

The wavelength to detect a 1/2 centimeter raindrop is around _ cm at __ _Hz

Answer 8

3 10 GHz

Question 9

Airborne weather radar will (not) detect snow and cat

Answer 9

not

Question 10

__ clouds are most readily detected

Answer 10

Cu

Question 11

The antenna can be ___ or ___

Answer 11

parabolic flat

Question 12

A ___ scanner reduces the power demand and sidelobes

Answer 12

flat

Question 13

In weather mode, the beam is ___, between _ and _ degrees, and ___ shaped

Answer 13

narrow, 3, 5, cone

Question 14

For mapping, the beam is ___ and ___ shaped

Answer 14

wide fan

Question 15

A clear area is more likely to indicate ___ water droplets as they will totally absorb the energy as they approach the size of the radar wave

Answer 15

large

Question 16

The greatest echoes come from ___

Answer 16

rain

Question 17

The __ of the drops is more important than the number

Answer 17

size

Question 18

Swept gain ___ the receiver gain the instant the pulses are fired, then progressively increases so that the echoes from distant ranges are amplified more than closer ones

Answer 18

decreases

Question 19

Full use below ___ft should be avoided

Answer 19

500

Question 20

Ground testing requires tilting __ in weather mode

Answer 20

up

Question 21

Tilt ___ until you see ground returns, then __ until they disappear, then __ _ more degrees

Answer 21

down, up, up, 2

Question 22

The tilt should be __ at lower altitudes, and ___ at higher ones

Answer 22

higher lower

Question 23

MAP mode uses a ___ radiation pattern with a ___ squared antenna, to scan a large ground zone.

Answer 23

cosecant cosecant

Question 24

Hail will show up better when gain is ___

Answer 24

reduced

Question 25

Target separated by a distance less than ___ the beam diameter will merge and appear on the display as one

Answer 25

half

Question 26

The minimum height above a storm cloud should be ___ft for every 10kts of wind speed

Answer 26

1000

Question 27

A hook indicates ___ wind circulations and will be found in TS with marked windshear in the ___ levels

Answer 27

strong, middle

Question 28

A finger with sharp contours means a ___ storm, fuzzy means a ___ storm.

Answer 28

growing, dissipating

Question 29

A U shape on a weather radar shows strong updraughts surrounded on ___ sides by the sort of heavy precip associated with downdraughts.

Answer 29

three

Question 30

Scalloped edges show severe attenuation due to heavy ___

Answer 30

precipitation

Question 31

Ground radar for longer range has ___ frequencies and ___ wavelengths, __ PRFs, and ___ pulses to get maximum range with the lowest attenuation.

Answer 31

lower, longer, lower, larger

Question 32

Typical ground radar coverage is ___-___nm with a frequency of ___ _Hz, and __ cm wavelength.

Answer 32

250-300, 600 MHz, 50

Question 33

Aircraft Surface Movement Radar operates on the _HF band, __ _Hz, using a __ RPM antenna

Answer 33

SHF, 16 60

Question 34

When an operator increases the range on a radar-display, the PRF ___ and the pulse length ___

Answer 34

decreases increases