Aux 1 Unit 11 Q11

1 / 10

What is the role of the hydraulic tensioner during the fitting of the bolt?

B) To apply a controlled amount of elongation to the bolt, allowing for precise tensioning without applying excessive torque

C) To weld the bolt in place

A) To permanently elongate the bolt

D) To measure the bolt's length

2 / 10

After the nut is tightened and the hydraulic pressure is released, what should be checked to ensure proper fitting of the bolt?

C) The color of the flange

B) The alignment and tension of the bolt using a torque wrench or other measuring device to ensure that the correct tension has been achieved

A) The temperature of the bolt

D) The position of the flange relative to the shaft

3 / 10

Once the bolt has been elongated using hydraulic pressure, what is the next step in the fitting process?

C) Release the hydraulic pressure immediately

B) Tighten the nut onto the flange face while the bolt is under tension

D) Heat the flange to expand it

A) Remove the hydraulic tensioner

4 / 10

What safety precautions should be taken during the fitting of a hydraulically tensioned bolt?

B) Ensure that all personnel are clear of the tensioner and bolt during pressure application, and use appropriate personal protective equipment (PPE) to avoid injury from hydraulic leaks or sudden release of tension.

A) No special precautions are necessary.

C) Apply maximum pressure to the tensioner to ensure a tight fit.

D) Use minimal pressure to avoid any risk.

5 / 10

What is the purpose of applying hydraulic pressure to a tensioning tool during the bolt fitting process?

C) To weld the bolt in place

B) To elongate the bolt, allowing the nut to be turned down against the flange face without frictional resistance

A) To loosen the bolt

D) To cool the bolt down

6 / 10

What final inspection should be conducted after the fitting of hydraulically tensioned bolts?

A) A visual inspection to check for any signs of misalignment or damage, followed by a recheck of the bolt tension to confirm that all bolts are correctly tensioned and secure.

B) No inspection is needed.

D) A reduction in hydraulic pressure to ensure a tight fit.

C) A re-tightening of all bolts by hand.

7 / 10

Why is it important to achieve the correct tension in hydraulically tensioned bolts?

A) To increase the vessel's speed

D) To simplify the maintenance process

B) To ensure the integrity of the joint and prevent loosening under operational loads, which could lead to failure

C) To reduce the need for lubrication

8 / 10

Why might hydraulic tensioning be preferred over traditional torque methods for securing bolts on a main propulsion shaft flange?

C) It requires no specialized equipment.

A) It is faster but less precise.

B) It provides more precise and even tensioning, reducing the risk of uneven load distribution and potential bolt failure.

D) It is more cost-effective.

9 / 10

What should be done if the correct tension is not achieved during the initial fitting of the bolt?

C) Replace the bolt immediately

B) Reapply hydraulic pressure, adjust the nut position, and recheck the tension until the correct value is achieved

A) Ignore the issue and proceed with operations

D) Reduce the engine speed to compensate

10 / 10

What is the first step in the fitting process of a hydraulically tensioned bolt for main propulsion shaft flanges?

C) Heating the bolt with a blowtorch

B) Ensuring the bolt, threads, and flange surfaces are clean and free from debris or corrosion

D) Tightening the bolt by hand

A) Applying hydraulic pressure immediately

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