Aux 1 Unit 10 Q1

1 / 10

Which type of actuator is most commonly used in the hub mechanism of a CPP to change the blade pitch?

A) Electric actuator

C) Pneumatic actuator

B) Hydraulic actuator

D) Manual actuator

2 / 10

What technology is most commonly used to transmit the blade pitch information to the bridge in a CPP system?

C) Pneumatic tubes

B) Electrical sensors that relay position data to the bridge indicator

D) Manual signals from the engine room

A) Mechanical linkages

3 / 10

How does the hydraulic system contribute to changing the pitch of the blades in a CPP?

C) By increasing the speed of the ship

D) By cooling the propeller blades

B) By providing the force needed to move the piston or actuator within the hub, which adjusts the blade angle

A) By rotating the entire propeller

4 / 10

In a CPP system, what is the function of the pitch control mechanism located in the hub?

B) To mechanically adjust the angle of the blades based on hydraulic pressure

A) To heat the propeller blades

C) To monitor the temperature of the hydraulic fluid

5 / 10

What is the primary component responsible for changing the pitch of the blades in a controllable pitch propeller (CPP)?

B) The hub mechanism, which includes a piston or actuator that moves the blades

A) The hydraulic pump

C) The ship's rudder

D) The main engine

6 / 10

How does the feedback system in a CPP mechanism ensure accurate pitch adjustment?

D) By stopping the propeller when adjustments are made

C) By rotating the propeller at a constant speed

A) By manually adjusting the blade angles

B) By continuously monitoring the blade position and sending signals to adjust the hydraulic pressure as needed

7 / 10

What is the advantage of using a controllable pitch propeller compared to a fixed pitch propeller?

C) It reduces the need for regular maintenance.

D) It simplifies the propulsion system.

A) It increases the vessel's maximum speed.

B) It allows for the adjustment of thrust without changing the engine speed, improving fuel efficiency and maneuverability.

8 / 10

How is the pitch of the blades typically indicated in a controllable pitch propeller system?

C) By the speed of the propeller rotation

B) By an indicator on the bridge that shows the current blade angle based on signals from the feedback system

D) By the color of the hydraulic fluid

A) Through a mechanical gauge directly attached to the propeller

9 / 10

Why is it important for the bridge crew to have an accurate indication of the blade pitch in a CPP system?

C) To reduce the need for regular maintenance

D) To monitor the engine temperature

A) To increase the vessel's speed

B) To ensure optimal fuel efficiency and safe maneuvering by adjusting the blade pitch according to navigational requirements

10 / 10

What role does the control lever on the bridge play in adjusting the pitch of a CPP?

C) It rotates the propeller.

B) It sends a signal to the hydraulic system to increase or decrease the pitch of the propeller blades.

A) It adjusts the ship's speed.

D) It changes the direction of the ship.

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