單項選擇題

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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單項選擇題

Propeller running at （） are generally efficient.

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

單項選擇題

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