Aux 1 Unit 3 Q3

1 / 10

Why is it important to clean ship’s side valves regularly?

A) To improve the valve’s appearance

C) To make the valve lighter

D) To reduce maintenance costs

B) To remove any marine growth or sediment buildup that could impair operation

2 / 10

What is the purpose of testing ship’s side valves under pressure?

A) To ensure they maintain their shape under stress

B) To confirm they can withstand the operating pressures without leaking

C) To check the compatibility with different types of lubricants

D) To ensure they do not make noise when operated

3 / 10

Why is grey cast iron not suitable for use in ship’s side valves?

A) It is too expensive to produce

D) It is difficult to machine and shape

C) It is too lightweight to provide adequate strength

B) It lacks sufficient corrosion resistance, especially in seawater environments

4 / 10

What is another suitable material for ship’s side valves, and why?

D) Plastic, because it is non-corrosive

C) Copper, because it is lightweight

B) Stainless steel, because it has high corrosion resistance and strength

A) Cast iron, because it is inexpensive

5 / 10

What should be done if a ship’s side valve is found to be leaking during maintenance?

D) Schedule the valve for replacement at the next port

B) Replace the valve immediately

C) Temporarily seal the valve with a gasket

A) Tighten the valve further

6 / 10

What is another reason grey cast iron is not used in ship’s side valves?

B) It is too brittle and can crack under impact or pressure

A) It has poor wear resistance

C) It is difficult to weld

D) It is a non-ferrous metal

7 / 10

Why should ship’s side valves be periodically lubricated?

C) To make them more resistant to impact

A) To prevent them from rusting and seizing

D) To enhance their aesthetic appearance

B) To reduce their weight and improve handling

8 / 10

What is an essential maintenance task for ship’s side valves?

C) Replacing the valve’s gasket every six months

B) Regular inspection and operation to ensure they are not seized or stuck

D) Polishing the valve body to remove any oxidation

A) Repainting the exterior to match the ship’s color scheme

9 / 10

Which of the following is a potential risk of using grey cast iron for ship’s side valves?

D) The valves may not be compatible with lubricants used in marine environments

C) The valves may shatter or crack, leading to leaks or flooding

A) The valves may expand and contract excessively with temperature changes

B) The valves may fail due to galvanic corrosion when in contact with other metals

10 / 10

Which of the following is a suitable material for ship’s side valves due to its corrosion resistance?

D) Aluminum

A) Brass

B) Mild steel

C) Bronze

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