You are assigned to a tractor tug with a...

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Question 1 of 2066636eef28f7522a1c51f71b

You are assigned to a tractor tug with a drive system as shown in figure "A" of the illustration. What type of propulsion drive system is illustrated? Illustration MO-0140

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66636eef28f7522a1c51f71b

You are assigned to a tractor tug with a drive system as shown in figure "A" of the illustration. What type of propulsion drive system is illustrated? Illustration MO-0140

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🔍 Key Concepts

• Compare the shape and orientation of the propeller blades in figure A with typical tug propulsion systems • Think about how an azimuthing (z-drive) unit looks versus a cycloidal (Voith‑type) unit under the hull • Notice whether you see a single screw with a rudder, or multiple vertical blades in a rotating disc, or a conventional shaft line

💭 Think About

• Look closely at what is hanging below the hull in figure A: do you see a regular screw propeller, or a circular disc with several vertical blades that rotate and change direction of thrust? • Which of the listed drive types can produce thrust in any horizontal direction without using a separate rudder, just by rotating the drive unit or changing blade pitch? • Ask yourself: which option describes a system commonly used on tractor tugs forward of the center of gravity for high maneuverability in ship‑handling ports?

✅ Before You Answer

• Identify the number and orientation of blades visible in figure A (horizontal like a normal propeller vs. vertical in a circular housing) • Decide whether there is a conventional shaft, fixed rudder, and stern screw – if you see those, that rules out some choices immediately • Match what you see to the defining feature of each choice: z‑drive (steerable pod with screw), controllable pitch (blade angle changes), conventional fixed (simple shaft + fixed‑pitch propeller), cycloidal (vertical blades in a rotating disc)

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Question 1 of 2066636eef28f7522a1c51f71b

You are assigned to a tractor tug with a drive system as shown in figure "A" of the illustration. What type of propulsion drive system is illustrated? Illustration MO-0140

Back

Question 1 of 20

66636eef28f7522a1c51f71b

You are assigned to a tractor tug with a drive system as shown in figure "A" of the illustration. What type of propulsion drive system is illustrated? Illustration MO-0140

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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