Aux 1 Unit 10 Q7

1 / 10

Why is skew important in propeller design?

C) It decreases the efficiency of the propeller.

D) It increases the vessel's fuel consumption.

A) It increases the propeller's weight.

B) It helps reduce vibrations and the effects of unsteady water flow, leading to smoother operation.

2 / 10

What does the term "rake" refer to in propeller design?

A) The angle of the propeller blades relative to the axis of the propeller hub

B) The number of blades on the propeller

C) The distance between the blade tip and the blade root

D) The curvature of the blade edges

3 / 10

What might cause an increase in propeller slip?

A) A decrease in vessel load

B) A damaged or fouled propeller

D) A decrease in water temperature

C) An increase in engine RPM

4 / 10

How does a higher pitch affect the performance of a propeller?

A) It decreases the vessel's speed.

B) It increases the amount of water the propeller moves, potentially leading to higher speeds but requiring more engine power.

D) It decreases fuel consumption.

C) It reduces the engine's power output.

5 / 10

Why is understanding propeller slip important for efficient vessel operation?

A) It helps determine the exact fuel consumption of the vessel.

D) It reduces the need for regular maintenance.

B) It provides insight into how efficiently the propeller converts engine power into thrust, helping to optimize performance and fuel efficiency.

C) It increases the vessel's top speed.

6 / 10

What does the term "pitch" refer to in the context of a propeller?

A) The distance the propeller would theoretically move in one complete revolution through a solid medium

D) The weight of the propeller

C) The number of blades on the propeller

B) The angle of the blades relative to the propeller hub

7 / 10

What is one advantage of having an aft rake in a propeller?

A) It increases the likelihood of cavitation.

B) It improves the propeller's clearance from the hull, reducing the risk of vibration and improving overall efficiency.

D) It makes the propeller easier to manufacture.

C) It reduces the propeller's ability to generate thrust.

8 / 10

What does the term "slip" refer to in propeller performance?

D) The thickness of the propeller blades

A) The difference between the theoretical distance a propeller should move in one revolution and the actual distance moved

B) The angle of the propeller blades

C) The weight of the propeller

9 / 10

How can high slip impact a vessel's performance?

C) It improves the vessel's maneuverability.

A) It can increase fuel efficiency.

D) It makes the vessel easier to handle in rough seas.

B) It can reduce the vessel's speed and increase fuel consumption, as more power is needed to maintain speed.

10 / 10

What does the term "skew" refer to in the context of propellers?

D) The vertical distance from the blade root to the blade tip

C) The distance between the leading and trailing edges of a propeller blade

B) The angle at which the propeller blades are mounted relative to the propeller shaft

A) The curvature of the propeller blades in the direction of rotation

Your score is