Aux 1 Unit 11 Q2

1 / 10

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

C) To avoid overheating the coupling

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

A) To increase the speed of the process

D) To increase the hydraulic pressure further

2 / 10

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

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

A) Manually tighten the coupling bolts

D) Cool the coupling to contract it

C) Rotate the shaft slowly while tightening

3 / 10

How is the hydraulic pressure applied during the tightening procedure?

C) By manually turning a screw

A) By using a hammer

D) By applying compressed air

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

4 / 10

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

D) Rotate the shaft to align the coupling

C) Heat the sleeve to expand it

A) Apply hydraulic pressure immediately

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

5 / 10

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

B) Tighten the coupling bolts further by hand

A) Visually inspect the coupling for gaps or uneven surfaces

C) Apply more hydraulic pressure

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

6 / 10

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

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

D) Replace the coupling immediately

C) Force the coupling into place with a hammer

A) Ignore the issue and proceed

7 / 10

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

C) By increasing the pressure indefinitely

B) By reducing the pressure until it is zero

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

D) By releasing all pressure at once

8 / 10

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

A) By visual inspection alone

C) By manually feeling the bolt tightness

D) By applying additional hydraulic pressure

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

9 / 10

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

D) By cooling the coupling rapidly

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

A) By applying heat to the coupling

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

10 / 10

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

C) Allow the coupling to cool before releasing the pressure

B) Tighten the coupling bolts manually

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