Vayudoot Aviation

1. Mumbai's position is 19 deg. 05 min N and 73 deg. 00 min. East. There is a place exactly North of Mumbai whose latitude is 21 deg. N and long. 73 deg. 00 min. East When IST in Mumbai is 1200 hrs. then the IST at the other place will be

1238

1200

1122

2. Local Mean Time of a place is the time lapsed since the transit of the mean sun over

its meridian

its antemeridian

the prime meridian

3. The LMT at a place in India is 0400. If the position of the place is 10 deg. N and 78 deg. East, the IST at that place will be

0418

0400

0342

4. Mean time has been introduced in order to

introduce a constant measurement of time, independent of the daily variations in the movement of the sun as observed from the earth.

compensate for the irregularities of the speed of rotation of the earth around it is axis.

have one fixed time to be used within the border of a country.

5. At 10 hr 10 min at 160° E, difference between zone time and LMT will be

LMT will be ahead of ZT by 20 min

Zone time will be ahead of LMT by 20 min

Zone time will be ahead of LMT by 40 min

6. Observer's meridian 40°N 11° 20'E. LMT 13:00 hrs Find LMT at (i) 060°N 121°21' E (ii) 53°S 110°23'W

- [UTC = LMT - D LONG/15 = 1300 - (11°20'/15) DIFF = 45 MIN = 13:00 HRS - 45 MTS = 12:15 HRS AT 0° E/W (UTC) (I) AT 121° 21'E 8 HR 05 MIN LMT = 12:15 + 8:05 = 20:20 HR, (II) DIFF = 7 HR 21 MIN LMT = 12:15 - 7:21 = 04:54 HR.]

- [UTC = LMT - D LONG/15 = 1500 - (11°20'/15) DIFF = 45 MIN = 13:00 HRS - 45 MTS = 12:15 HRS AT 0° E/W (UTC) (I) AT 121° 21'E 8 HR 05 MIN LMT = 12:15 + 8:05 = 20:20 HR, (II) DIFF = 7 HR 21 MIN LMT = 12:15 - 7:21 = 04:54 HR.]

7. When GMT at CHennai 1300N 8300E is 110 hrs. The IST at Kolkatta 2000N 8830E will be

1122

1630

1100

8. Find LMT, ZT and IST (82.5°E) at 30°N 90° E if UTC is 02:00 hrs

- [UTC = 02:00 HRS, ZT = 08:00 HRS, LMT = 08:00 HRS, IST = 07:30 HRS]

- [UTC = 02:00 HRS, ZT = 08:00 HRS, LMT = 08:00 HRS, IST = 06:30 HRS]

9. Consider the following statements on sunrise and sunset

in November sunset occurs earlier at 4500S than at 4500N.

in May sunrise occurs later 4500N than at 4500S.

at equator sunrise and sunset occur at quite regular times throughout the year.

10. A is at longitude 01230E and B is at longitude 04315E LMT in B is 1749. What is the LMT in A?

1706

1546

1952

11. ZT at 52° 30'E is 12:00 hrs. Find UTC and LMT

- [52°30' ÷ 13 = 3. UTC = 09:00 HRS LMT = 11:30 HRS]

- [52°30' ÷ 13 = 3. UTC = 09:00 HRS LMT = 12:30 HRS]

12.
LMT at A (42° 23/N 105° E) is 01:00 hrs on 12/02. Find UTC and LMT at place B which is (23° 45'S 62°W)

- [AT 105°E LMT = 01:00 AT 0° DIFF = 07 HR (I) TIME 1800 UTC ON PREVIOUS DAY(11/2) (II) AT 62° W DIFF = 4 HR 08 MIN. TIME 13:52 PREVIOUS DAY (11/3)]

- [AT 105°E LMT = 01:00 AT 0° DIFF = 07 HR (I) TIME 1800 UTC ON PREVIOUS DAY(11/2) (II) AT 62° W DIFF = 4 HR 08 MIN. TIME 13:52 PREVIOUS DAY (11/2)]

13.
An a/c takes off from X (35°S 168°W) for place Y (32°S 164°15'E) It flies for 8h 20', time of departure X is 2145 hr LMT 2nd June. Find ETA at Y in LMT.

- [FLIES FOR 8 HR 20 MIN. TIME OF DEPARTURE = 21:45 HRS ON 02/06 LMT AT ARRIVAL AT PLACE OF DEPARTURE LMT = 21:45 HRS + 08:20 HRS = 06:05 HRS ON 03/06. UTC = 06:05 HRS + 168 ÷15=17:17 HRS ON 03/06. LMT AT Y = 17:17 HRS + 164°15' ÷15 = 04:14 HRS. LMT AT Y = 04:14 HRS 04 JULY.]

- [FLIES FOR 8 HR 20 MIN. TIME OF DEPARTURE = 21:45 HRS ON 02/06 LMT AT ARRIVAL AT PLACE OF DEPARTURE LMT = 21:45 HRS + 08:20 HRS = 06:05 HRS ON 03/06. UTC = 06:05 HRS + 168 ÷15=17:17 HRS ON 03/06. LMT AT Y = 17:17 HRS + 164°15' ÷15 = 04:14 HRS. LMT AT Y = 04:14 HRS 04 JUNE.]

14. What is the meaning of the term "standard time"?

it is another term for UTC

it is an expression for local mean time

it is the time set by the legal authorities for a country or part of a country

15. The sun rises at 50°N and 025°E on the 25th January at 0254UTC. On the same day what time does it rise at 50°N and 040°W?

2154 UTC.

0254 UTC.

0714 UTC.

16. I.S.T. and the LMT of a place can be the same only when

all the above

the Longitude of the place is 82 deg. 30 min. East

the place is in India

17. LMT at 55° 29' N000° E is 1200 hrs on 01 March. Find UTC at 23° 23' S180°E

- [12:00 HRS 02 MARCH.]

- [12:00 HRS 01 MARCH.]

18. UTC at 93°30' W is 0100 hrs. Find ZT

- [ZT 92°30' ÷ 15 = 6. ZT = 01:00-06:00 = 18:00 HRS.]

- [ZT 92°30' ÷ 15 = 6. ZT = 01:00-06:00 = 19:00 HRS.]

19. What does 5 hours 50 minutes and 20 seconds change of longitude represent?

80°05

87°35

35°15

20. The local mean time at longitude 095°20'W at 0000UTC is

1738:40 same day

0621:20 previous day

1738:40 previous day

21. On the 27th of February, at 52°S and 040°E, the sunrise is at 0243UTC on the same day, at 52°S and 035°W, the sunrise is at

0243 LMT

0743 LMT

0523 LMT

22. The times given for sunrise, sunset, morning and evening twilight in the air almanac

are given in standard time.

are given in UTC.

are given in LMT.

23. An a/c is crossing IDL from 150°E to 108°W at 0000 UTC, at destination

Date is behind and LMT is ahead

LMT is behind and date is ahead.

Both LMT and date are behind

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