The operating speed of a turbocharger is directly dependent upon（）

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• If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）

  A . decrease until the engine speed increases B . increase as the load increases C . decrease as the load D . increases remain unchanged

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• THE SPEED OF A VESSEL ADJUSTED TO THAT OF A PILOT BOAT AT WHICH THE PILOT CAN SAFELY EMBARK is （）.

  A . Ground speed B . Boarding speed C . Relative speed D . Speed of the vessel

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• The Navigation Rules state that a vessel shall be operated at a safe speed at all times so that she can be stopped within（）.

  A . the distance of visibility B . 1/2 the distance of visibility C . a distance appropriate to the existing circumstances and conditions D . the distance that it would require for the propeller to go from full ahead to full aster

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• The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

  A . an isochronous governor B . elastic engine mounts C . a vibration damper D . a cast iron bed plate with good flexible qualitie

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• During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）

  A . Flywheel inertia B . Admission of starting air C . The way of the vessel D . securing of fuel to the cylinder

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• Operating a rotary pump at speeds in excess of design requirements could cause（）.

  A . decreased clearances between rotating parts B . decreased slippage to the suction side of the pump C . air binding in the discharge ports D . erosion and excessive wear

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• When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.

  A . pick up more of any increase in load B . pick up less of any increase in load C . share an equal amount of any increase in load D . drop an equal amount of any decrease in load

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• Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）

  A . Loss of suction B . Increased clearances C . Decreased clearance D . Decreased slippage

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• A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.

  A . slow-speed diesel B . medium-speed diesel C . high-speed diesel D . constant-speed diesel

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• An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）

  A . advance as the load increases B . retard as the load increase C . remain unchanged regardless D . always occur at top dead center

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• The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel （）within half the range of visibility.

  A . stopping B . being stopped C . to stop D . to be stopped

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• As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.

  A . propeller velocity B . speed of advance C . wake distribution D . wake fractio

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• The rotor of the hydraulic motor rotates at a speed proportional to the （）.

  A、flow of oil B、pressure of oil C、flow and pressure of oil D、temperature of oil

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• The term MODERATE SPEED was previously interpreted as meaning a speed which would enable a vessel（）within half the range of visibility.

  A . stopping B . to stop C . to be stopped D . to be stopping

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• The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.

  A . two-stroke B . four-stoke C . long-stroke D . short-stroke

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• An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.

  A . manoeuvring operations B . bad combustion C . cooling D . mooring trial

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• During the watch at sea, where situations occur in the machine apace which may affect the speed maneuverability, power supply or other essentials for the safe operation of the ship（）should be informed as soon as possible.

  A . the chief engineer B . the master C . the bridge D . the company superintendent

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• In restricted visibility the speed of a vessel without operational radar may be（）enable effective avoiding action to be taken on sighting another ship.

  A . too low to B . too high to C . too high for D . too low for

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• Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）

  A . engine support vibration isolator B . detuner or viscous fluid damper C . lightened crankshaft flywheel D . spherically seated crankshaft bearing

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• We shouldn’t start to machine a work-piece until we first check the operation of the machine.

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• The term "moderate speed" was previously interpreted（解释） as meaning a speed which would enable a vessel ______within half the range of visibility.

  A.stopping B.being stopped C.to stop D.to be stopped

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• Computers will become more advanced and they will also become easier to use.Improved speed recognition will make the operation of a computer easier. Virtual reality（虚拟现实）, the technology of（请作答此空） wit

  A．interact B． interacting C． communicate D． Using

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• 6、1993年5月，“曙光一号”计算机，运算速度达到当时世界先进水平，运算速度为______。 In May 1993, dawn one computer, with the operating speed of the world's best at that time, had.

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