Aux 1 Unit 11 Q7

1 / 10

Which type of flexible coupling is commonly used in marine propulsion systems for its ability to handle large torque loads and accommodate misalignment?

D) Magnetic coupling

A) Jaw coupling

C) Rigid coupling

B) Gear coupling with flexible elements

2 / 10

In a main propulsion drive, why might a flexible coupling be preferred over a rigid coupling?

C) Flexible couplings increase fuel consumption

D) Flexible couplings reduce the propulsion system's overall efficiency

A) Flexible couplings are heavier

B) Flexible couplings can accommodate shaft misalignments and absorb vibrations, reducing the likelihood of damage to the propulsion system

3 / 10

How does a flexible coupling contribute to the reduction of vibration in a propulsion drive?

C) By amplifying the vibrations for better detection

A) By increasing the vibration frequency

B) By absorbing and dampening vibrations generated by the engine, preventing them from being transmitted to the propulsion shaft

D) By isolating the shafts completely

4 / 10

What material is often used in the flexible element of a coupling to ensure durability and flexibility in marine environments?

B) Metal

A) Plastic

C) Elastomeric materials, such as rubber or polyurethane

D) Wood

5 / 10

What is another reason for using a flexible coupling in a marine propulsion drive related to shock loads?

C) To increase the system's rigidity

B) To absorb shock loads and torsional vibrations, protecting the connected machinery from sudden force impacts

A) To reduce the load on the engine

D) To prevent any movement of the shafts

6 / 10

What is a key component of a typical flexible coupling used in a main propulsion drive?

D) A fixed metal rod

A) A rigid metal disc

B) A flexible element, such as a rubber or elastomeric disc, that allows for slight movement and flexibility between the connected shafts

C) A wooden block

7 / 10

Why is a flexible coupling used in propulsion drives to handle shaft misalignment?

B) To accommodate slight misalignments between the connected shafts, reducing the stress on the bearings and other components

D) To prevent any movement between the shafts

A) To increase the alignment precision required during installation

C) To make the system more rigid

8 / 10

What is the primary function of the flexible element in a flexible coupling?

A) To increase the shaft's speed

D) To prevent the coupling from rotating

B) To absorb and compensate for misalignment, vibrations, and shock loads between connected shafts

C) To reduce the shaft's diameter

9 / 10

Which of the following best describes a flexible coupling used in a main propulsion drive?

A) A coupling that is rigid and does not allow any movement between connected shafts

B) A coupling designed to transmit torque while accommodating slight misalignments, absorbing vibrations, and reducing shock loads

C) A coupling that only connects shafts without transmitting any torque

D) A coupling that is permanently welded to both shafts

10 / 10

How does a flexible coupling reduce the transmission of vibrations from the engine to the propulsion shaft?

B) By absorbing and damping vibrations through its flexible elements, preventing them from being transmitted to the propulsion shaft

C) By increasing the rigidity of the connection

D) By rotating in the opposite direction to cancel out vibrations

A) By amplifying the vibrations

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