Maintain Hull Out Of The Water

Question 1

What is the name for a water cooled after bearing on your property shaft?
A. Radial
B. Cutlass
C. Heat exchanger bearing
D. Coupling

Answer 1

B Cutlass

Question 2

When checking a vessels prop you look for?
A. Thin sharp edges
B. Pitting and dark wear patches
C. Bent blades and edge damage
D. All of the above

Answer 2

D. All of the above

Question 3

Normal anti foul is not suitable for aluminium because.
A. The hull will act as an anode
B. The anti foul will act as an anode
C. The anti foul falls of in a short time
D. They attract more marine growth

Answer 3

A. The hull l will act as an anode

Question 4

The function of a zinc anode is to reduce corrosion
A. In all metals
B. In metals lower on the atomic table
C. In metals higher on the atomic table
D. In steel and bronze when used with aluminium.

Answer 4

C. In metals higher on the atomic table

Question 5

When attaching a tear drop anode ensure
A. The rounded heavy end faces downwards
B. The rounded heavy end faces towards the bow
C. The sharp end faces the bow
D. The sharp end faces downwards

Answer 5

B. The rounded heavy end faces towards the bow

Question 6

How would deterioration of a steel vessel be identified
A. Smooth area of paint and dull surfaces
B. Rough surfaces and areas of black paint
C. Rust stains, blistering paint and pitting
D. Cracks and grey areas

Answer 6

C. Rust stains, blistering paint and pitting

Question 7

If an anode is unaffected what could be the problem
A. Incorrect attachment
B. High levels of corrosive activity
C. Low levels of electrolysis
D. Reasonable cathode affect

Answer 7

A. Incorrect attachment

Question 8

Why would you check the vertical movement of the shaft?
A. Too hard to move sideways
B. To ensure the shaft is attached to the gearbox
C. To check the under hull clearance of the prop
D. To check wear on the prop shaft bearing

Answer 8

D. To check wear on the prop shaft bearing

Question 9

In what way can poor grounding do to a vessel? It can cause damage to the
A. Prop, Shaft, rudder and other equipment.
B. Hull plating and hull materials
C. Engine cooling systems
D. All of the above

Answer 9

D. All of the above

Question 10

An older style, planked vessel should be best taken out of the water on
A. A hardstand
B. A crane
C. A sling
D. A cradle on a slipway

Answer 10

D. A cradle on a slipway

Question 11

On what sort of a haul out facility is
tide height most important
A. A slipway
B. A travel lift
C. A crane
D. A floating dry dock

Answer 11

A. A slipway

Question 12

When slipping your vessel you should
A. Top up fuel tanks to reduce free surface effect
B. Move big items onto the deck to make work easier
C. Reduce fuel, water, sullage loads
D. Ensure all paints, tools etc are on board.

Answer 12

A. Top up fuel tanks to reduce free surface effect
C. Reduce fuel, water, sullage loads

Question 13

When relaunching a vessel you should
A. let the boat yard take control of the procedure
B. Be onboard to ensure the hulls integrity
C. Check the yards EPA and insurance validity
D. Leave any rubbish ashore

Answer 13

B. Be onboard to ensure the hulls integrity

Question 14

Any unusual Or new vibration in the hull or propeller shafting can be an indication of
A. Clutch spillage
B. Overheated bearings
C. High engine speeds
D. Prop Inbalance

Answer 14

D. Prop Inbalance

Question 15

A piece missing from one blade of a four bladded prop could result in
A. Accelerated stern bearing wear
B. Excessive shaft vibrations
C. Unusual noises
D. All of the above

Answer 15

D. All of the above

Question 16

In order to prevent overheating of the packing in the stern tube stuffing box
A. The gland is properly adjusted to permit a slight leakage of sea water
B. Stave type rubber seals are used
C. Cooling water is supplied from the freshwater cooling system
D. The gland nuts must be tightly taken up to prevent any water leakage

Answer 16

A. The gland is properly adjusted to permit a slight leakage of sea water

Question 17

Water leaking through the stern tube stuffing box is used to accomplish which of the following actions
A. Cooling
B. Lubrication
C. Flushing
D. Both A and B
E. Both A and C

Answer 17

D. Both A and B

Question 18

The prop shaft of an ocean going vessel is usually supported by the
A. Spring bearings
B. Tail Bearings
C. Stern tube bearings
D. Prop Bearings

Answer 18

D. Prop Bearings

Question 19

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the
A. Prop hub
B. Lignum Vitae
C. Gland packing
D. Labyrinth Seal

Answer 19

C. Gland packing

Question 20

Which of the following precautions should always be carried out in dry dock
A. Liquids should never be transferred between tanks without consulting the dock master
B. If sea valves have been disassembled they must be checked for leakage when the ship is refloated.
C. Before refloating all sea chest strainers should be verified as having been replaced
D. All of the above

Answer 20

D. All of the above