Engine : General Subjects - 1380/1128
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| What type of propeller consists of a flat disc set flush with the under surface of the vessel's hull with a number of vertical, rudder-like blades projecting from it? |
| A) Helicoidal propeller |
| B) Cycloidal propeller |
| C) Contra-rotating propeller |
| D) Tandem propeller |
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