螺旋桨1. _ of the controllable pitch propeller enables the blades to be moved to change the pitch angle.A. An external mechanism B. An internal mechanismC. An interlock device D. A hunting gear system 2. _ on a ship transmits power from the engine to the propeller.A. Automatic control system B. Speed regularly systemC. The transmission system D. Compression air system 3. A sealing arrangement is provided at _ of the tail-shaft with the propeller and cone completing the arrangement.A. both ends B. neither end C. the outboard end D. either end 4. A variable pitch propeller is made _ a boss with separate blades mounted into it.A. of B. up of C. from D. out 5. Early stern-tube bearing used bearing materials such as lignumvitae which were lubricated by _.A. oil B. grease C. fresh water D. sea water6. The transmission system is made up of shafts, bearings, and finally the _.A. thrust shaft B. propeller C. reduction gear box D. train transmission7. _ on board the ship transfers power from the main engine to the propeller.A. The transmission system B. The supply system C. The chain system D. The control system8. The different items in the transmission system consist of _.A. the thrust shat B. one or more intermediate shafts C. the tail-shaft D. A, B and D9. The function of the thrust block is to transfer the thrust from the propeller to _.A. the tail-shaft B. ahead and astern thrustC. the main propulsion engine D. the hull of the ship10. A controllable pitch propeller on a diesel driven vessel eliminates the need for _.A. friction clutches B. disconnect clutches C. reversing gears D. reduction gears11. The control system for a controllable pitch propeller can be programmed _. . to produce a maximum combined propeller and engine efficiency between pitch and a given engine speed; . for continuous operation of the engine at pre-set condition.A. only is correct B. only is correctC. both and are correct D. neither or are correct12. The driving force of a propeller is transmitted to the hull through the _.A. bevel gear teeth B. helically cut gear teeth C. sleeve bearings D. thrust bearing13. A thrust bearing is used with a propulsion diesel engine to _.A. control axial movement of the crankshaftB. transmit engine thrust to the propeller shaftC. absorb vibrations in the propeller shaftingD. prevent propeller thrust from being transmitted to the hull14. In using reduction gears to obtain efficient propeller speeds, _.A. they must be located at the after end of the engineB. they can only be used with one engine at a timeC. they eliminate the need for controllable pitch propellersD. they are connected to the engine with a flexible coupling15. What is the function of the thrust bearing?A. Prevents lateral movement of the slow speed gear.B. Transmits propeller thrust to the hull.C. Keeps spring bearings in line.D. Prevents main reduction gear axial movement.16. When the propeller blades are integral with the hub, the propeller is called a _.A. built up propeller B. solid propeller C. controllable pitch propeller D. suction back propeller17. Compared to a constant pitch propeller, a controllable pitch propeller _.A. more efficiently uses available engine powerB. operates at a lower efficiency at a fixed speedC. produces the same torque at lower engine powerD. develops its rated power at a lower speed18. Vessel propellers are classified as being right hand or left hand. A right hand propeller turns clockwise when viewed from _.A. the bow B. the stern C. the port side D. the starboard side19. Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed _.A. apparent slip B. true slip C. pitch D. propulsive efficiency20. By which of the following means is force efficiently provided to vary the pitch of the blades on a modern controllable pitch propeller?A. Hydraulic B. Mechanical C. Pneumatic D. Electrical21. When a vessel is in dry-dock, the vessels engineers should _.A. examine the condition of the propeller.B. chip and paint all hull protection zincsC. install new docking plugs in all cofferdamsD. inspect the hull for hogging or sagging22. If the pitch of a propeller is constant throughout the length and breadth of the blade, it is said to be of _.A. constant pitch B. variable pitch C. uniform pitch D. non-uniform pitch23. If the pitch varies radially or circumferentially, the propeller is said to be of _.A. constant pitch B. variable pitch C. uniform pitch D. non-uniform pitch2