单选题The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.A lathedB shapedC shrunkD developed

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke

A.①

B.②

C.① and ②

D.Neither ① nor ② is correct

Accidental flooding of the engine room bilges by the bilge main is prevented by( ).

A.stop-check valves installed in the bilge suction manifolds

B.using a positive displacement reciprocating bilge pump

C.installing educators in all bilge rose boxes

D.installing a swing check before each bilge valve

_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A.An air receiver

B.An operating valve

C.An automatic valve

D.An air distributor

A thrust bearing is used with a propulsion diesel engine to ____.

A.control axial movement of the crankshaft

B.transmit engine thrust to the propeller shaft

C.absorb vibrations in the propeller shafting

D.prevent propeller thrust from being transmitted to the hull