Q 1) A vessel on a course of 090O speed 19 knots.
The wind estimated by
observing the sea surface was 22 knots. Funnel smoke was blowing towards South.
State what entry is to be made in weather report regarding wind direction and
speed?
b) Explain with a suitable sketch the “Wind Rose” given in the Admiralty Sailing
Directions.
Q 2) Ship’s course SW by W at 12 knots from a true wind was observed to be
coming from 2 points abaft starboard beam. The funnel smoke was blowing
towards a direction 3 points abaft port beam. Find the speed of true and apparent
wind and state what entries are to be made in ship’s log book and weather report.
(15 Marks)
b) State Buy’s Ballots Law and its uses. (05 Marks)
Q 3) A vessel estimated wind force 7 (33 knots) by watching sea waves. Her course
was 076O(T) speed 17 Knots. Funnel smoke was blowing towards 352O(T). State,
what entry is to be made in log book for wind direction and speed?
b) Describe Buy’s Ballot’s law and its limitations.
Q 4) Own Vessel was on SSE’ly course with speed 13 Knots. Anemometer showed a
reading of 32 knots. The direction of wind by observing line of waves was from her
stbd beam. What entry will you make in deck log and in weather report for wind
direction and speed? If OOW threw a piece of paper, in which direction will it
fly? (15 marks)
b) What is Geostrophic wind? (05 marks
Q 5) A vessel on a course of 320O(T) speed 15 knots. The anemometer and wind
vane showed 20 knots and 045O(T) respectively. State what entry is to be made in
weather report regarding wind direction and speed? In which direction the funnel
smoke will be blowing?
b) Explain Pressure Gradient Force and Coriolis Effect.
Q6) On a course of 045O(T), at 16 knots find the apparent wind direction and
speed if a true easterly wind of 14 knots was blowing. (15 Marks)
b) Explain what is TRUE WIND and APPARENT WIND? (05 Marks
Q 7) Differentiate between Gust & Squall (05 Marks)
b) On a course of 045O speed 15 knots. Apparent wind 100O at 20 knots. Find the
direction speed of true wind.
(15 Marks)
Q 8) A vessel on a course of 310O(T), speed 20 knots, observes the direction of
wind by looking at the line of waves as NE. The anemometer at that time showed a
speed of 28 knots. State the direction in which the funnel smoke will blow. State
what direction and speed of wind is to be entered in the log book. (15 marks)
b) Describe Coriolis force.
Q 9) A vessel steering 060O (T) at 15 kts, experiencing apparent wind @ 14 kts
coming from 30O on port bow. Find the direction and speed of true wind.
b) What are the various means of finding out true wind direction at sea?
Q 10) Write short notes on Trough and Ridge.
b) On a course of north at 11 knots, find the apparent wind direction and speed if a
true easterly wind of 14 kts was blowing.
Q 11) For a vessel on NE’ly course and speed of 25 Knots, an anemometer showed
wind direction N by E and speed 20 knots. Find what entry is to be made in deck
log book regarding wind direction and speed?
b) Explain with a sketch the pressure gradient force and its importance.
Q 12) A vessel steering a course of 160O (T) at a speed 12 Knots, found wind speed
of 10 kts from anemometer & funnel smoke was blowing towards 025O (T). Find
what entry is needed in Log book.
b) What is Buys Ballot’s Law?
Q 13) Vessel’s course was 275 deg T and speed 14.0 knots. The wind indicated by
the Anemometer was 60 deg to Starboard and the speed indicated by
Anemometer was 7.0 knots. State what entry you will make in the Deck Log Book
regarding True Wind?
b) State the caution to be exercised whilst applying Buy’s Ballot’s Law.
Q 14) A vessel was steering a westerly course at 15 knots. The wind direction and
speed displayed by anemometer was 060O(R) on port bow at 10 knots. What entry
for true wind is to be made in ships logbook, and weather message respectively.
Q 15) A vessel is steering a course 080O(T) at a speed of 12 knots. Direction of
wind as obtained by observing line of sea waves was ‘Westerly’ but apparent wind
direction was ‘N’. State what direction and wind speed is to be entered in the log
book? Towards which direction will the funnel smoke fly?
b) Explain Coriolis force, how it affects the winds in both Hemisphere.
Q 16) Vessel’s course 275OT, speed 14 kts, the wind direction and speed displayed
by the anemometer was Stbd 060O and 7 kts. What entry for true wind is to be
made in the logbook?
b) Explain what is pressure gradient force and Coriolis force.
Q a) Draw a neat sketch illustrating Fohn Wind Effect.
b) Ship course SW by W at 12 kts. True Wind observed to be 2 points abaft the
starboard beam. The funnel smoke was blowing in a direction 3 points abaft port
beam. Find the speed of the true and apparent windand state what entries will be
made in ship’s log book and weather report.
