Smokeboat Quiz #1

Bouyancy & Compartmentation

1) The first boats to use diesel engines were the _____ class.
a) E
b) K and L
c) A
d) C and H


3) To control forward and after compensation _____ tanks are used.
a) variable ballast
b) trim
c) auxiliary
d) #1 and #7 ballast


5) The overall weight of a submerged submarine is not changed by admitting water to the M.B.T., but the:
a) volume of displaced water has been increased
b) weight of the displaced water is greater
c) volume of the displaced water has been reduced
d) volume of displaced water has not been changed


7) When is the stability of a submarine at a minimum?
a) When on the surface
b) When submerged
c) When all tanks are dry
d) When the center of gravity and center of bouyancy coincides


9) From the time the diving alarm sounded with the submarine on the surface, to the time the diving officer reported "Final trim", the ship would have been in which of the following conditions of bouyancy?
a) Positive and negative bouyancy
b) Negative and neutral
c) Neutral bouyancy only
d) Positive, negative and neutral bouyancy
2) Compensation of a boat is obtained by transferring ballast in the form of water between:
a) variable tanks and sea
b) fuel ballast and variable tanks
c) sea and main ballast
d) variable and main ballast


4) When the fuel ballast tanks are empty and converted, the: 
a) submerged speed is increased
b) freeboard is decreased
c) freeboard and surface speed is increased
d) freeboard is decreased and surface speed is increased


6) The center of bouyancy of a body:
a) lies at the geometric center of volume of the displaced liquid
b) lies at the geometric center of the immersed or floating body
c) does not change in relation to the center of gravity of a floating body when the body is being immersed
d) coincides with the center of gravity of the floating or immersed body


8) The longitudinal stability of a submerged submarine is:
a) the same as its transverse stability
b) less than its transverse stability
c) approximately twice its transverse stability
d) approximately 240 times its transverse stability


10) There are _____ compartments in a submarine seperated from each other by pressure transverse bulkheads provided with watertight pressure resisting hatches or doors.
a) 6
b) 7
c) 8
d) 9

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