SPECIMEN EXAMINATION FOR SECOND MATE 



41 



When water vapor condenses in a 

 storm area and is precipitated in the 

 form of rain, snow, etc., what is the 

 etfect upon the temperature of the air? 



Which is lighter: 



(a) dry air; 



(b) moisture laden air? 



What are isallobars? What is their 

 value in constructing weather maps 

 and forecasting? 



In what direction do warm fronts 

 usually move and what is their average 

 speed of movement? 



In the Southern Hemisphere, in 

 which semi-circle of a tropical cyclone 

 would a vessel be if the wind shifted 

 counter-clockwise, while she was hove 

 to? 



In the Northern Hemisphere, how 

 should a steam vessel maneuver in the 

 dangerous semi-circle of a tropical cy- 

 clone? 



Hove to in the Southern Hemisphere 

 under tropical cyclone conditions with 

 the barometer falling and the wind 

 shifting clockwise, what is the vessel's 

 probable position relative to the center 

 of the storm, and what action should be 

 taken if possible to avoid the center of 

 the storm? 



Describe the use of a "storm card" or 

 diagram of wind direction in maneuver- 

 ing in a tropical cyclone area. 



What weather conditions may result 

 from the movement of a cold air mass 

 over a warmer sea surface? 



If the smoke from the funnel does not 

 rise, but lays horizontally, what atmos- 

 pheric conditions are indicated? 



What is the "Bermuda high"? 



What causes the fog frequently en- 

 countered off the grand banks of New- 

 foundland? 



How can a ridge of high mountains 

 give rise to a depression? 



What is a central area of high pres- 

 sure called and in what direction do 

 winds circulate around it in both the 

 Northern and Southern Hemispheres? 



What is a line called which connects 

 all points on a weather chart that have 

 the same reading of the barometer? 



What is the relation between wind 

 direction and the direction of the iso- 

 bars on a weather chart? 



Draw a sketch of the earth showing 

 the location of high and low pressure 

 belts and the general wind systems. 



What is the normal barometric pres- 

 sure at sea level? 



Where can detailed information 

 about ocean winds and currents be ob- 

 tained? 



How do you determine the reliability 

 of the ship's barometer, whether mer- 

 curial or aneroid? 



State how Buys-Ballot's law is used 

 at sea in order to determine the approx- 

 imate bearing of a storm center. 



What is the dew point of the atmos- 

 phere and how is it determined? 



What is the distinction between tide 

 and current? 



Hove to in advance of a tropical cy- 

 clonic storm, in what position would a 

 vessel be with respect to the track fol- 

 lowed by the storm center if: 



(a) The wind veered; 



(b) The wind backed ; 



(c) The wind remained steady in 

 direction and increased in force? 



What are the dangerous and navi- 

 gable semicircles of a ti'opical revolving 

 storm in the Northern Hemisphere? 



What are the indications of the ap- 

 proach of revolving storms? 



What is a Warm Front? 



What does the size of waves depend 

 upon? 



What are the two reliable sig^ns of 

 field ice? 



Sketched below are vertical cross sec- 

 tions through two types of frontal sys- 

 tems. 



(a) What are fronts called when 

 the warm air is aloft? 



(b) What type of such a front is 

 "A" and what type is "B"? 



COLDER AIR 



690-515 O - 63 



