In twin-screw engine installations while going ahead，maneuvering qualities are most effective when the tops of the propeller blades both turn（）.

A . available minimum requirements B . available maximum requirements C . mandatory minimum requirements D . mandatory maximum requirement

A . governor malfunctions B . fuel injection system malfunctions C . high cylinder lube oil temperatures D . low intake temperature

A . If one screw is stopped，the ship will turn toward the side of the stopped screw B . The principal force which turns the ship is set up by the wake against the forward side of the rudder C . Turning response by use of the rudder only is greater than on a single-screw vessel D . With the rudder amidships，the ship will steer a fairly steady course

A . in any emergency or if in any doubt as to what decision or measures to take B . in the event of any impending action in machinery spaces that may cause reduction in ship’s speed C . when isolating and bypassing machinery to be worked on D . co-operating with any engineer in charge of maintenance work

A . one engine ahead and one engine astern，with full rudder B . one engine ahead and one engine astern，with rudders amidships C . both engines ahead，with full rudder D . both engines astern，with full rudder

A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

A . The chief engineer B . The second engineer C . The third engineer D . The fourth engineer

A . decreased compression pressure B . increased lube oil pressure C . lower lube oil temperature D . excessive leakage past the piston ring

A . acidity of the oil B . pour point of the oil C . flash point of the oil D . viscosity of the oil

A . lower the no-load RPMs B . provide more air for combine with the fuel C . increase the no-load RPMs D . provide more fuel combine with the air

A . immediately open all crankcase relief ports B . increase crankcase exhauster speed to draw cool air into the engine C . allow the engine to cool naturally D . increase crank case scavenge air to remove unburned gase

A . electric motor B . hydraulic motor C . compressed air D . turning gear

A . opposed to the crankshaft rocking couple B . resonant with the crankshaft natural frequency C . critical fore and aft crankshaft vibrations D . horizontal whipping motions of the crankshaft

A . opposed-piston engine B . double-acting engine C . two-stroke/cycle engine D . four-stroke/cycle engine

A . reluctant B . positive C . possible D . improper

A . as long as B . unless C . despite D . till

A . as much fuel as B . less fuel than C . less fuel as D . more fuel tha

A . will set B . shall set C . set D . set

A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

A . increase exhaust back pressure B . causes excessive crankcase pressure C . can only be detected by a compression check D . decreases fuel consumptio

A . ensure all machinery which may be used during maneuvering is in ready B . ensure an adequate reserve of power is available for steering gear and other requirements C . keep the main propulsion unit controls continuously attended when in the manual mode of operation D . ensure all machinery which may be used during maneuvering is running stably

A.electric motor B.hydraulic motor C.compressed air D.turning gear