Aux 1 Unit 1 Q2

1 / 25

How is the final torque of the coupling bolts verified after completing the tightening procedure?

B) By using a torque wrench to ensure that the bolts are tightened to the specified torque values

A) By visual inspection alone

D) By applying additional hydraulic pressure

C) By manually feeling the bolt tightness

2 / 25

How do quick-closing valves contribute to environmental protection on a ship?

D) By automatically adjusting the fuel temperature

A) By ensuring fuel is burned more efficiently

C) By maintaining stable fuel pressure in the system

B) By preventing overboard discharge of oil in the event of a tank rupture

3 / 25

Which of the following is an advantage of using hydraulic actuation for quick-closing valves?

C) Operates independently of the ship’s electrical system

B) Provides high force output, even in compact systems

A) Requires minimal maintenance

D) Is the most cost-effective option

4 / 25

Why are quick-closing valves installed on fuel oil service tanks aboard a ship?

B) To allow for quick isolation of the tank in case of a fire

D) To facilitate routine maintenance of the fuel system

C) To regulate the fuel pressure

A) To control the temperature of the fuel

5 / 25

What should be done after the coupling sleeve is expanded and the coupling is positioned correctly?

A) Release the hydraulic pressure immediately

D) Gradually release the hydraulic pressure to allow the sleeve to contract and secure the coupling

B) Tighten the coupling bolts manually

C) Allow the coupling to cool before releasing the pressure

6 / 25

In a pneumatic actuation system for quick-closing valves, what is the primary medium used to actuate the valve?

D) Seawater

A) Hydraulic fluid

B) Electric current

C) Compressed air

7 / 25

What is a potential drawback of using electric motor actuation for quick-closing valves?

D) Requires frequent manual adjustments

C) High operational noise levels

A) Limited availability of electric power on ships

B) Slow response time compared to other methods

8 / 25

Why are quick-closing valves considered essential for safety in marine fuel systems?

D) They control the flow of air into the fuel tanks

C) They allow the quick shutdown of fuel flow to prevent fires or leaks from spreading

B) They prevent fuel contamination

A) They maintain fuel pressure within safe limits

9 / 25

Why are quick-closing valves fitted on tanks containing hazardous liquids, such as fuel oil or lubricating oil?

B) To quickly isolate the tanks and prevent spills or fires

D) To prevent the tanks from overfilling

C) To automatically mix the liquids with water in case of an emergency

A) To ensure the liquids remain at a constant temperature

10 / 25

In addition to fuel oil tanks, which other types of tanks on a ship might be fitted with quick-closing valves?

D) Sewage holding tanks

A) Freshwater storage tanks

C) Lubricating oil tanks

B) Ballast water tanks

11 / 25

In the event of a fire in the engine room, how do quick-closing valves help in managing the emergency?

C) By allowing more air into the engine room

D) By releasing pressure from the fuel tanks

B) By stopping the fuel supply to prevent the fire from spreading

12 / 25

What is one method used to determine that the push fit is complete in a hydraulic sleeve-type coupling?

C) By rotating the shaft until the coupling falls into place

D) By cooling the coupling rapidly

A) By applying heat to the coupling

B) By observing the alignment marks on the coupling and shaft, ensuring they are correctly aligned

13 / 25

What additional check can be performed to ensure that the push fit is fully completed?

D) Test the coupling by rotating the shaft at full speed

B) Tighten the coupling bolts further by hand

A) Visually inspect the coupling for gaps or uneven surfaces

C) Apply more hydraulic pressure

14 / 25

Once the coupling surfaces are prepared, what is the next step in the tightening procedure?

C) Rotate the shaft slowly while tightening

D) Cool the coupling to contract it

B) Apply hydraulic pressure to expand the sleeve, allowing the coupling to slide into place

A) Manually tighten the coupling bolts

15 / 25

Where are quick-closing valves most commonly fitted on a ship to ensure safety in case of an emergency?

D) On the bilge pumping system

A) On the main engine's exhaust manifold

C) On the freshwater cooling system

B) At the bottom of fuel oil tanks

16 / 25

How can hydraulic pressure be used to confirm that the push fit of the coupling is complete?

D) By releasing all pressure at once

C) By increasing the pressure indefinitely

A) By measuring the hydraulic pressure level to ensure it reaches the specified value for the correct fit

B) By reducing the pressure until it is zero

17 / 25

What should be done if the coupling does not seat properly after releasing the hydraulic pressure?

D) Replace the coupling immediately

C) Force the coupling into place with a hammer

A) Ignore the issue and proceed

B) Reapply hydraulic pressure and adjust the coupling position before releasing the pressure again

18 / 25

In an emergency situation, how is a quick-closing valve typically actuated remotely?

A) By manually operating a lever directly on the valve

B) By triggering a remote control switch from a safe location

C) By applying high pressure directly to the valve housing

D) By using a radio signal transmitted from the bridge

19 / 25

Which of the following is a common method for remotely actuating quick-closing valves in a marine environment?

C) Pneumatic actuation

A) Electric motor actuation

B) Hydraulic actuation

D) All of the above

20 / 25

What is the primary purpose of fitting quick-closing valves on fuel oil tanks aboard a ship?

B) To rapidly stop fuel flow in case of a fire or emergency

C) To regulate the temperature of the fuel

A) To ensure continuous fuel supply to the engine

D) To increase the fuel flow rate to the engine

21 / 25

On a ship, where would quick-closing valves most likely be found to protect against the risk of fire or environmental contamination?

B) On the bilge system discharge

A) On the main engine exhaust outlet

D) On the air conditioning system's refrigerant lines

C) At the base of diesel oil and fuel oil tanks

22 / 25

How is the hydraulic pressure applied during the tightening procedure?

B) By applying hydraulic fluid through designated ports on the coupling sleeve

A) By using a hammer

D) By applying compressed air

C) By manually turning a screw

23 / 25

Why is it important to release the hydraulic pressure gradually during the tightening process?

B) To ensure that the coupling is seated properly and that the tension is evenly distributed across the coupling surface

D) To increase the hydraulic pressure further

A) To increase the speed of the process

C) To avoid overheating the coupling

24 / 25

What is the first step in the tightening procedure for a hydraulic sleeve-type coupling on a main propulsion shaft?

A) Apply hydraulic pressure immediately

B) Ensure that the coupling surfaces and sleeve are clean and free of debris or corrosion

C) Heat the sleeve to expand it

D) Rotate the shaft to align the coupling

25 / 25

Which location on a vessel would not typically be equipped with quick-closing valves?

D) Diesel oil service tanks

A) Lubricating oil tanks

C) Main seawater cooling system

B) Fuel oil tanks

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