單項(xiàng)選擇題For a propeller direct driven by the engine,().

A.the thrust pads are while metal faced on both sides
B.the thrust pads are while metal faced only on the forward side
C.the thrust pads are while metal faced only on the after side
D.intermediate shaft usually supported by a plummer block


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1.單項(xiàng)選擇題Propeller running at () are generally efficient.

A.high speeds
B.medium speed
C.low speeds
D.the same speed with the engine

2.單項(xiàng)選擇題Which is not the maintenance work for shaft bearings in transmission system?()

A.check oil level in bearing sump
B.check them for leakagec through end seals
C.pump bilges in time
D.check temperature

3.單項(xiàng)選擇題Water lubricated tailshaft bearings wear,()

A.the after one is more than forward one
B.the forward one is more than after one
C.the forward one is the same with after one
D.it depends on the type of engine

4.單項(xiàng)選擇題When sailing in cold zones, the() should be drained of water.

A.the ventilation pipe
B.the water line for fire fighting on the deck
C.the fuel oil line
D.the water supplying line in bath room

5.單項(xiàng)選擇題When sailing in cold zones, the() should be heated.

A.the steering gear room
B.the fire fighting pipe line
C.the fuel oil tank
D.the bath room

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