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Question 170-1 : Which statement about the content of continuous volmet messages vhf and scheduled volmet messages hf is correct ? [ Practice protocol ]
Both types of volmet messages shall contain trend forecasts where available
Ecqb03 july 2016 ..both types of volmet messages shall contain current metar and speci together with trend forecasts where available .icao annex 3 .11 6 use of aeronautical broadcasting service contents of volmet broadcasts.11 6 1 continuous volmet broadcasts normally on very high frequencies vhf shall contain current metar and speci together with trend forecasts where available .11 6 2 scheduled volmet broadcasts normally on high frequencies hf shall contain current metar and speci together with trend forecasts where available and where so determined by regional air navigation agreement taf and sigmet
Question 170-2 : Which of these statements is true . 396 ?
Local snow and severe aircraft icing can be expected over germany
Ecqb03 august 2016
Question 170-3 : When the sky is overcast what means are used by meteorological services for measuring wind in any height between earth's surface and 10000 m ?
Radiosondes
Ecqb03 august 2016
Question 170-4 : Which instrument is used for measuring atmospheric humidity ?
Psychrometer
Eqcb03 december 2016 ..psychrometer or hygrometer
Question 170-5 : The visibility transmitted in a metar is ?
The value that is reached or exceeded within at least half the horizon circle on the aerodrome
Admin .the visibility transmitted in a metar is the visibility value that is reached or exceeded within at least half the horizon circle or within at least half of the surface of the aerodrome these areas could comprise contiguous or non contiguous sectors
Question 170-6 : Which of the following metars reflect the weather conditions expected at brussels airport ebbr at 1200 utc . 415 ?
21014kt 5000 ra bkn015 ovc030 15/12 q1011 nosig=
Question 170-7 : Which of these statements about weather satellites are correct or incorrect .1 the pictures from satellites in a polar orbit are generally of higher resolution than the pictures from geostationary satellites.2 satellites in a polar orbit are closer to the earth than geostationary satellites ?
1 is correct 2 is correct
Admin .polar orbiting satellites are close to the surface they provide higher resolution pictures .polar orbiting satellites orbit the earth at an altitude of approximately 850 km .geostationary satellites orbit the earth at about 36000 km of altitude over the equator
Question 170-8 : The correct interpretation for the message below is .mod ws rwy 16 fcst = ?
Wind shear between runway 16 level and and 1600 ft above that level
Admin .icao annex 3.7 4 wind shear warnings and alerts .7 4 1 wind shear warnings shall give concise information of the observed or expected existence of wind shear whichcould adversely affect aircraft on the approach path or take off path or during circling approach between runway level and 500 m 1 600 ft above that level and aircraft on the runway during the landing roll or take off run the warnings shall be prepared and disseminated for aerodromes where wind shear is considered a factor in accordance with local arrangements with the appropriate ats authority and operators concerned and by the meteorological office designated to provide service for the aerodrome or disseminated directly from automated ground based wind shear remote sensing or detection equipment referred to in 7 6 2 a and b where local topography has been shown to produce significant wind shears at heights in excess of 500 m 1 600 ft above runway level then 500 m 1 600 ft shall not be considered restrictive
Question 170-9 : A meteorological briefing is ?
An oral commentary on existing and/or expected meteorological conditions
Question 170-10 : An aircraft encounters severe turbulence the pilot must ?
Issue a special air report message
Question 170-11 : The angle between the true great circle track and the true rhumb line track joining the following points a 60° s 165° w b 60° s 177° e at the place of departure a is ?
7 8°
Admin .change in longitude between a and b = 18°. = 1/2 g sin lm = 1/2 x 18° x sin 60 = 9 x 0 866 = 7 79°
Question 170-12 : In order to fly from position a 10°00'n 030°00'w to position b 30°00'n 050°00'w maintaining a constant true course it is necessary to fly ?
A rhumb line track
Admin .rhumb lines or loxodromes are tracks of constant true course .great circle is the shortest distance between two points . 1462
Question 170-13 : The rhumb line track between position a 45°00'n 010°00'w and position b 48°30'n 015°00'w is approximately ?
315°
Admin . 1360.we have an isoceles triangle .the track between position a and position b will be approximately 270° + 45° = 315°
Question 170-14 : The diameter of the earth is approximately ?
12 700 km
Admin .earth's diameter 6900 nm 12700 km .earth's circumference 21600 nm 40000 km
Question 170-15 : The maximum difference between geocentric and geodetic latitude occurs at about ?
45° north and south
Admin .geocentric latitude is measured from the centre of the ellipsoid geodetic or geographic latitude which is what is normally measured is the angle between the plane of the equator and the line which is normal to the ellipsoid at the point of interest unlike geocentric latitude this line does not typically pass through the centre of the ellipsoid whenever the unqualified term latitude is used it will normally mean the geographic latitude . 1785.the relation between the geodetic latitude and the geocentric latitude is . 1361.the geodetic and geocentric latitudes are equal at the equator and poles the value of the squared eccentricity is approximately 0 007 depending on the choice of ellipsoid and the maximum difference between geocentric and geodetic latitude is approximately 11 5 minutes of arc at a geodetic latitude of 45°6'
Question 170-16 : If an aéronef was to circle around the earth following parallel 60°n at a ground speed of 480 kt in order to circle around the earth along the equator in the same amount of time it should fly at a ground speed of ?
960 kt
Admin .distance around earth at 60ºn is 360° x 60 nm x cos60º = 10800 nm.distance around earth at the equator = 360° x 60 nm = 21600 nm.10800 nm is half the distance of the circle around the equator so for the same time to cover twice the distance it should fly at a ground speed of .2 x 480 kt = 960 kt
Question 170-17 : An aircraft passes position a 60°00'n 120°00'w on route to position b 60°00'n 140°30'w .what is the great circle track on departure from a ?
279°
Admin .rhumb line or loxodrome route following a parallel or flying a constant latitude at constant true course from a to b is 270° .conversion angle = 1/2 g sin lm.conversion angle = 0 5 x 20 5 x sin 60° = 9° .the great circle track on departure from a is 270° + 9° = 279° .g = difference of longitude .lm = mean latitude . 1462.for a westerly track in northern hemisphere a great circle track at departure is larger than the rhumb line
Question 170-18 : A great circle track joins position a 59°s 141°w and b 61°s 148°w .what is the difference between the great circle track at a and b ?
It increases by 6°
Admin . 1376.the formula to calculate convergency between two positions relatively close to each other is .convergency = difference of longitude x sin mean latitude .convergency = 7° x sin60°.convergengy = 7° x 0 866 = 6°
Question 170-19 : What is the longitude of a position 6 nm to the east of 58°42'n 094°00'w ?
093°48 5'w
Admin . 1378.distance = change in longitude x cos of latitude. .6 nm = change in longitude x cos 58 7..change in longitude = 6 nm / cos 58 7 = 11 55' .change in longitude = 0 193° .94 0 193 = 93 807°.093°48 5'w
Question 170-20 : The great circle distance between position a 59°34 1'n 008°08 4'e and b 30°25 9'n 171°51 6'w is ?
5 400 nm
Admin .the shortest route is right over the north pole distance = differences in the latitudes .90° 60°n exactly 59°34 1'n = 30°.90° 30°n exactly 30°25 9'n = 60°.total 90° .90° x 60 nm = 5400 nm
Question 170-21 : Given .position a 45°n °e position b 45°n 45°15'e distance a b = 280 nm b is to the east of a .required longitude of position a ?
38°39'e
Admin .g = distance / cos latitude.g = 280 / 0 707.396 minutes 6°36' .a is to the west of b .45° 6°36' = 38°24'e.close enough to 38°39'e
Question 170-22 : 265 us gal equals specific gravity 0 80 ?
803 kg
Admin .1 usg = 3 79 litres.265 x 3 785 = 1004 litres .1004 x 0 8 = 803 kg
Question 170-23 : On the 27th of february at 52°s and 040°e the sunrise is at 0243 utc on the same day at 52°s and 035°w the sunrise is at ?
0743 utc
Admin .the earth moves around the sun at a rate of 4 minutes per degree of longitude 15°/h latitude remains the same only the longitude changes 040°e to 035°w = 75° .75° and 4 minutes per degree = 5h .the sunrise is at 0743 utc 02h43 + 5h at longitude 35°w .dalton .utc is utc everywhere sorry but the good answer is 0243 utc . .so the sun rises everywhere on earth at the same utc hour at 0243 utc .caestudent109 .the utc is the same everywhere around the earth the good answer is 0243 utc . .example .it is 8 o'clock utc and the sun is rising at london .does the sun rise at 08h00 utc at new york .cesarmachado . are right as usual utc it's used to give a common time but it is only the same as local time at prime meridian anywhere else will give different utc for the same local time over greenwich at 1000 utc will be 1000 lt but over new york the same 1000 utc will be utc 4 hours so 0600 lt if the sun rises everywhere at 0600 will be in ny at 1000 utc and in london at 0600 utc
Question 170-24 : The rhumb line distance between points a 60°00'n 002°30'e and b 60°00'n 007°30'w is ?
300 nm
Admin .between 002°30 east and 007°30 west there is 10° difference of longitude .distance = difference of longitude x 60 nm x cos latitude.10° x 60 nm x cos 60 = 300 nm
Question 170-25 : An aircraft is flying a great circle orthodromic route between two points .wpt 1 60°n 030°w wpt 2 60°n 020°w .what will be the approximate latitude at longitude 025°w ?
60°05 7'n
Admin .the great circle track is on the pole side of the rhumb line 60°n then at 025°w your northerly latitude will be more than 60°n .f = & d / 230.f= greatest vertical distance in nm between ortho & loxo route this is what we are looking for .& = givry correction = 1/2 g sin lm ==>1/2 10 sin 60 = 4 33°.d = 10 x 60 x cos60 = 300 nm.f = 4 33 x 300 / 230 = 5 64' . 1403.the aeroplane is flying a great circle orthodromic route = shortest distance .to memorise/visualise the relative position of orthodrome route vs loxodrome route loxodrome route= following a parallel or flying a constant latitude remember the acronym 'p o l e'.p = north or south pole .o= orthodrome .l= loxodrome .e= equator
Question 170-26 : An aircraft travels from point a to point b flying a great circle route .the coordinates of a is 45°s 010°w and b is 45°s 030°w .the true course of the aircraft on its arrival at b to the nearest degree is ?
277°
Admin .flying a great circle route = orthodromic route = shortest distance.loxodrome route= following a parallel or flying a constant latitude. 1405.conversion angle = 1/2 g sin lm.g change of longitude 20° .lm = mean latitude 45° .conversion angle = 1/2 x 20° x sin45°.conversion angle =7°.the true course of the aircraft on its arrival at b = 270° + 7° = 277°
Question 170-27 : Which is the highest latitude listed below at which the sun will rise above the horizon and set every day ?
62°
Admin .the times for sunrise and sunset are based on the ideal situation where no hills or mountains obscure the view and the flat horizon is at the same altitude as the observer sunrise is the time when the upper part of the sun is visible and sunset is when the last part of the sun is about to disappear below the horizon in clear weather conditions .for locations north of 66°34' n or south of 66°34' s latitude the sun will be above the horizon all day in the summer and below the horizon all day in the winter .the sun will be seen to rise and set every day up to 62°
Question 170-28 : The utc of sunrise on 6 december at winnipeg canada 49°50'n 097°30'w is . 2471 ?
14 13
On the almanac at position 50°n close to 49°50'n we can read that sunrise is at 07 40 december 4th and at 07 43 on december 7th .for december 6th sunrise will be at 07 42 local time at winnipeg .now we must convert local time to utc .the conversion factor between lmt and utc is arc change of longitude converted to time .change of longitude = 097°30'.097°30' x 4 minutes per degree = 6 30.7 43 + 6 30 = 14 13
Question 170-29 : When it is 1000 standard time in kuwait the standard time in algeria is . 2472 ?
08 00
Admin .on the almanach you can read on top .'the time given should be > substracted from standard time to give utc '.10 00 3 = 07 00 utc in kuwait.'the time given should be > added to utc to give standard time '.07 00 utc +1 = 08 00 st in algeria
Question 170-30 : The value of magnetic variation ?
Has a maximum of 180°
Admin .the minimum magnetic variation declination is 0° the maximum magnetic variation declination is 180°and this will be along a line between the magnetic north pole and the geographic north pole . 1417
Question 170-31 : The horizontal component of the earth's magnetic field ?
Is stronger closer to the magnetic equator
Question 170-32 : When it is 0600 standard time in queensland australia the standard time in hawaii usa is . 2473 ?
10 00
Admin .it is 0600 standard time in queensland first page list i places fast on utc austrialia+queensland = 10 h.they state the times given below should be substractd from standard time to give ut . 06h00 10h = 20h00 utc the previous day .standard time in hawaii .20h00 utc refer to list iii places slow on ut united sates of america+hawaii 10 h .they state the times given below should be substraced from ut to give standard time .20h00 utc 10 h = 10h00
Question 170-33 : The circumference of the earth is approximately ?
21600 nm
.360° x 60 nm = 21600 nm
Question 170-34 : Isogonic lines connect positions that have ?
The same variation
Admin . 1425.isogonic lines connect positions that have the same variation .agonic line a line which joins all points where the value of magnetic variation is zero
Question 170-35 : The local mean time at longitude 095°20'w at 0000 utc is ?
17h38 40 previous day
Admin .the greenwich meridian is selected as standard meridian lmt local mean time at the greenwich meridian is equal to greenwich mean time gmt .at 00h00 utc it's midnight at the greenwich meridian .on earth we have 24 timezones so 360°/24h = 15°/h.each timezone equals 15° on earth's surface .if we move west ot the greenwich meridian we 'come back' .as we move of 95 3° thus 953°/15 = 6 3533 h 6h41min 20 sec .6h41 20 sec before midnight it is 17h 38 40 the previous day
Question 170-36 : 5h 20min 20sec corresponds to a longitude difference of ?
80°05'
Admin .5h 20min 20sec = 5 x 60 + 20 3 = 320 3 min .each degree of longitude is equivalent to four minutes in time or 1h = 15° .320 3 min = 320 2/4° = 80 075' 80°05'
Question 170-37 : What is the value of the magnetic dip at the magnetic south pole ?
90°
.magnetic dip is the angle between the horizontal and vertical forces acting on a compass needle toward the nearer pole . 1430.at the magnetic poles the earth's magnetic field is perpendicular to the earth's surface magnetic dip is 90° at the magnetic poles a dip needle stands vertical
Question 170-38 : What is the meaning of the term standard time ?
It is the time set by the legal authorities for a country or part of a country
Question 170-39 : What is the local mean time position 65°25'n 123°45'w at 2200 utc ?
1345
Admin .123 75' x 4 minutes per degree = 495 minutes.495 minutes = 8h35.west of greenwich we substract 8h35 to 22h00 = 13h45
Question 170-40 : The main reason that day and night throughout the year have different duration is due to the ?
Inclination of the ecliptic to the equator
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