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CPL Test Series
Question Bank
Questions for CONVERGENCY
Answer the following questions
Test Mode
Training Mode
1. Great circle from P to Q measured at P=095° Southern hemisphere Conversion angle P - Q = 7° What is the rhumb line track P - Q?
109
088
102
2.
For northern hemisphere: G/C bearing of B from A = 040° R/L bearing of B from A = 045° Find R/L bearing of A from B, G/C bearing of A from B
- [I) R/L BEARING OF A FROM B = 225° II) G/C BEARING OF A FROM B = 230°]
- [I) R/L BEARING OF A FROM B = 225° II) G/C BEARING OF A FROM B = 234°]
3.
A and B are on parallel of 30°S, longitude of A is 12°E, G/C brg of A from B is 266° Find longitude of B.
- [CA = 4° CONVERGENCY = 8°, 8° = D LONG × SING 30°, D LONG = 16°, LONG OF B = 28°E.]
- [CA = 4° CONVERGENCY = 8°, 8° = D LONG × SING 30°, D LONG = 16°, LONG OF B = 28°W.]
4. Point A Latitude - 59°00'N, Longitude - 010°00'W , Point B Latitude - 65°00'N, Longitude- 010°00'E , Gc Tkat A - 050° , Conv _____ , GCTk from B to A ______ ,CA ________, RL track at A ________,GC track at B _________.
- [ CONV'Y - 17.6°, GCTK FROM B TO A - 247.6°, CA - 8.8°, RL TRACK AT A - 058.8°, GC TRACK AT B - 067.6.]
- [ CONV'Y - 17.6°, GCTK FROM B TO A - 247.6°, CA - 8.8°, RL TRACK AT A - 058.8°, GC TRACK AT B - 069.6.]
5. An aircraft passes position A (60°00'N120°00'W) on route to position B(60°00'N140°30'W). What is the great circle track on departure from A?
261°
288°
279°
6. G/C bearing of P from Q is 060°. CA = 8° in northern hemisphere. Find (i) R/L bearing of P from Q. (ii) GC bearing of Q from P (iii) R/L bearing of Q from P.
- [(I) R/L BEARING OF P FROM Q=068° (II) GC BEARING OF Q FROM P = 256° (III) R/L BEARING OF Q FROM P = 243°. ]
- [(I) R/L BEARING OF P FROM Q=068° (II) GC BEARING OF Q FROM P = 256° (III) R/L BEARING OF Q FROM P = 248°. ]
7. The average true course of the great circle is 100°. The true course of the rhumb line at point A is
107°
104°
100°
8.
R/L brg of X from Y is 240° in Southern hemisphere. CA is 8° find G/C brg of Y from X.
- [G/C BRG FORM Y TO X = 232° R/L BRG OF Y FROM X = 060° G/C BRG OF Y FROM X = 068°]
- [G/C BRG FORM Y TO X = 232° R/L BRG OF Y FROM X = 060° G/C BRG OF Y FROM X = 063°]
9. X and Y are on parallel 45°. G/ C brg of Y form X is 262°. Longitude of X 3° E, find long of Y.
- [CA = 8° CONVERGENCY = 16°, 16° = D LONG × SIN 45°, 22°37' = D LONG, 19°37'W.]
- [CA = 8° CONVERGENCY = 16°, 16° = D LONG × SIN 45°, 22°37' = D LONG, 19°37'S.]
10.
G/C bearing of B from A is 096°. Longitude of A 178°E. Find longitude of B.
- [R/L TRACK B FROM A IS 090°, CA = 6° CONVENGENCY = 12°, 12° = D LONG × SIN 40°, 18° 40' = D LONG, 163°20'S.]
- [R/L TRACK B FROM A IS 090°, CA = 6° CONVENGENCY = 12°, 12° = D LONG × SIN 40°, 18° 40' = D LONG, 163°20'W.]
11. Point A Latitude - 47°00'S, Longitude - 125°00'W, Point B Latitude - 41°00'S, Longitude - 135°00'W, Gc Tkat A - 300°, Conv _____ , GCTk from B to A ______ ,CA ________ ,RL track at A ________, GC track at B _________.
- [CONV'Y - 6.9°, GCTK FROM B TO A -126.9°, CA - 3.5°, RL TRACK AT A - 303.5°,GC TRACK AT B - 306.9.]
- [CONV'Y - 6.9°, GCTK FROM B TO A -126.9°, CA - 3.5°, RL TRACK AT A - 303.5°,GC TRACK AT B - 309.9.]
12.
G/C brg of X from Y 130°, G/C brg of Y from X 318°. Find (i) CA (ii) hemisphere (iii) R/L brg of Y from X.
- [(I) 4° (II) NORTHERN (III) 314° ]
- [(I) 4° (II) NORTHERN (III) 334° ]
13. Point A Latitude - 50°00'S, Longitude -170°00'W, Point B Latitude - 73°00'S , Longitude - 135°00'W, Gc Tkat A _______ , Conv _____ , GCTk from B to A - 309° , CA ________ , RL track at A _________ ,GC track at B _________.
- [ GC TKAT A - 159.8°, CONV - 30.8°, CA - 15.4°, RL TRACK AT A - 144.4°, GC TRACK AT B - 124.]
- [ GC TKAT A - 159.8°, CONV - 30.8°, CA - 15.4°, RL TRACK AT A - 144.4°, GC TRACK AT B - 129.]
14. G/C brg of X from Y 300°. CA = 7° in northern hemisphere. Find G/C brg of Y from X
- [108°]
- [106°]
15. Point A Latitude - 55°00'N, Longitude - 110°00'W, Point B Latitude - 75°00'N, Longitude - 010°00'E, Gc Tkat A - 022°, Conv _____ , GCTk from B to A ______, CA ________ , RL track at A ________ , GC track at B _________.
- [CONV'Y - 0108.8°, GCTK FROM B TO A - 310.8°, CA - 54.4°, RL TRACK AT A - 076.4°,GC TRACK AT B -130.8.]
- [CONV'Y - 0108.8°, GCTK FROM B TO A - 310.8°, CA - 54.4°, RL TRACK AT A - 076.4°,GC TRACK AT B -131.8.]
16. Point A Latitude - 73°00'S, Longitude - 120°00'E, Point B Latitude - 55°00'S, Longitude - 150°00'E, Gc Tkat A _______ , Conv _____ , GCTk from B to A - 203°, CA ________ , RL track at A _________ , GC track at B _________.
- [ GC TKAT A - 050°, CONV - 27°, CA - 13.5°, RL TRACK AT A - 036.5°, GC TRACK AT B - 026.]
- [ GC TKAT A - 050°, CONV - 27°, CA - 13.5°, RL TRACK AT A - 036.5°, GC TRACK AT B - 023.]
17.
G/C brg of Y from X = 048° R/L brg of Y from X = 039° Find (i) Conversion angle (ii) Hemisphere (iii) G/C brg of X from Y
- [(I) 9° (II) SOUTHERN HEMISPHERE (III) 210°]
- [(I) 9° (II) SOUTHERN HEMISPHERE (III) 214°]
18. A great circle track joins position A (59°S141°W) and B(61°S148°W). What is the difference between the great circle track at A and B?
it increases by 3°
it decreases by 6°
it increases by 6°
19. What is the standard formula for convergency?
convergency=dlat x cos mean latitude.
convergency=dlong x sin mean latitude.
convergency=dlat x sin mean latitude.
20. The angle between the true great-circle track and the true rhumb-line track joining the following points: A (60°S165°W), B(60°S177°E), at the place of departure A, is
7.8°
15.5°
5.2°
21.
G.C brg of A from B = 234°, G/C brg of B from A = 066° Find R/L brg of B from A.
- [234° − 180° = 54°, 66° − 54° = 12°, CONVERGENCY = 12°, CA = 6°, R/L BRG OF B FROM A = 040°]
- [234° − 180° = 54°, 66° − 54° = 12°, CONVERGENCY = 12°, CA = 6°, R/L BRG OF B FROM A = 060°]
22. Point A Latitude - 75°00'N, Longitude - 100°00'W, Point B Latitude - 50°00'N, Longitude - 025°00'W, Gc Tkat A _______ , Conv _____ , GCTk from B to A ______ , CA ________ , RL track at A - 128°, GC track at B _________.
- [ GC TKAT A - 094.7°, CONV - 66.5°, GCTK FROM B TO A - 341.2°, CA - 33.3°, GC TRACK AT B - 163.2.]
- [ GC TKAT A - 094.7°, CONV - 66.5°, GCTK FROM B TO A - 341.2°, CA - 33.3°, GC TRACK AT B - 161.2.]
23. Point A Latitude - 75°00'N, Longitude - 010°00'E, Point B Latitude - 60°00'N, Longitude - 075°00'W, Gc Tkat A _______, Conv _____ , GCTk from B to A ______ ,CA ________, RL track at A - 245° , GC track at B _________.
- [ GC TKAT A - 284.3°, CONV - 78.5°, GCTK FROM B TO A - 025.7°, CA - 39.3°, GC TRACK AT B - 209.7.]
- [ GC TKAT A - 284.3°, CONV - 78.5°, GCTK FROM B TO A - 025.7°, CA - 39.3°, GC TRACK AT B - 205.7.]
24. The great circle track X - Y measured at X is 319°, and Y 325° Consider the following statements
scuthern hemisphere, rhumb line track is 331°.
scuthern hemisphere, rhumb line track is 322°.
scuthern hemisphere, rhumb line track is 313°.
25.
G/C bearing of A from B is 130° conversion angle = 6° in southern hemisphere (i) R/L brg of A from B (ii) R/L brg of B from A (iii) G/C brg of B from A
- [(I) 124° (II) 304° (III) 248° ]
- [(I) 124° (II) 304° (III) 298° ]
26. Point A Latitude - 75°00'S, Longitude - 160°00'W , Point B Latitude - 60°00'S, Longitude - 165°00'E, Gc Tkat A _______ , Conv _____ , GCTk from B to A ______ , CA ________ , RL track at A - 312°, GC track at B _________.
- [ GC TKAT A - 295.8° , CONV - 32.3°, GCTK FROM B TO A -148.1°, CA - 16.2°, GC TRACK AT B - 329.1.]
- [ GC TKAT A - 295.8° , CONV - 32.3°, GCTK FROM B TO A -148.1°, CA - 16.2°, GC TRACK AT B - 328.1.]
- [ GC TKAT A - 295.8° , CONV - 32.3°, GCTK FROM B TO A -148.1°, CA - 16.2°, GC TRACK AT B - 326.1.]
27.
G/C brg of P from Q is 097°. R/L brg of Q from P = 275° Find G/C brg of Q from P.
- [CONVERGECY = 4° G/C BEARING OF Q FROM P = 277° − 4° = 243°]
- [CONVERGECY = 4° G/C BEARING OF Q FROM P = 277° − 4° = 273°]
28. The rhumb line track between position A (45°00'N010°00'W) and position B (48°30'N015°00'W) is approximately
345
315
330
29. Point A Latitude - 55°00'S, Longitude - 120°00'E, Point B Latitude - 73°00'S, Longitude - 170°00'E, Gc Tkat A _______ , Conv _____ , GCTk from B to A - 287° , CA ________ , RL track at A _________ , GC track at B _________.
- [GC TKAT A - 151.9°, CONV - 44.9°, CA - 22.5°, RL TRACK AT A - 129.4°, GC TRACK AT B - 109.]
- [GC TKAT A - 151.9°, CONV - 44.9°, CA - 22.5°, RL TRACK AT A - 129.4°, GC TRACK AT B - 107.]
30.
A and B are on parallel of 30°N. G/C brg of B from A = 273°. Longitude of A = 8°E, find long of B.
- [CONVERGENCY = D LONG × SIN LAT = D LONG × SIN(30°), 12° = D LONG, LONG OF B = 4° E.]
- [CONVERGENCY = D LONG × SIN LAT = D LONG × SIN(30°), 12° = D LONG, LONG OF B = 4° W.]
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