單項(xiàng)選擇題The（）is fitted in the main steam supply line and is usually of the non-return type.

A.main steam stop valve
B.auxiliary steam stop valve
C.feed check or control valve
D.blow down valve


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1.單項(xiàng)選擇題The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.

A.fuel valves of main engine
B.injector pump of main engine
C.safety valves of marine boiler
D.safety valves of a reciprocating pump

2.單項(xiàng)選擇題The propeller is pushed on to the tubeshaft taper and made tight by（）

A.a mechanical seal
B.keyway and key
C.a nut
D.shrinkage

3.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

4.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

5.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