A change in engine speed is required before a governor is able to make a corrective movement of fuel rackThis aspect of governing is commonly expressed as a percent and is known as （）

相似题目

• In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall

  A . Ⅰ only B . Ⅱ only C . either Ⅰ or Ⅱ D . neither Ⅰ or Ⅱ

  查看最佳答案

• The main function of tie rods in the construction of large, low speed diesel engines is to（）.

  A . stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength B . accept most of the tensile loading that results from the firing forces developed during operation C . mount the engine frame securely to the hull to prevent shaft coupling misalignment D . connect the crosshead solidly to the piston rod

  查看最佳答案

• Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the engine speed to initially （）.

  A . increase B . decrease C . fluctuate D . remain constant

  查看最佳答案

• Bridge orders must be （） and a record of any required changes in speed and direction should be kept.

  A . slowly carried away B . carried out with a period of delay C . promptly carried out D . paid by the captai

  查看最佳答案

• （） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.

  A . Bulbs B . Bulks C . Flyweights D . Flywheel

  查看最佳答案

• An over-speed trip stops a diesel engine when the engine （）

  A . runs out of fuel B . has low lubricating oil pressure C . exceeds a set maximum speed D . has high cooling water temperature

  查看最佳答案

• In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）

  A . governor droop B . speeder spring tension C . fuel rack lag D . load on the engine

  查看最佳答案

• The device used to limit engine torque at various engine speeds is called a （）

  A . speed limiting governor B . variable speed governor C . constant speed governor D . load limiting governor

  查看最佳答案

• Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

  A . Splash lubrication B . Pressure lubrication C . Sight feed lubricators D . Mechanical lubricator

  查看最佳答案

• A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.

  A . air turbulence B . fuel penetration C . fuel spray angle D . fuel injection rate

  查看最佳答案

• The ability of the governor to prevent fluctuations in engine speed is termed （）.

  A . sensitivity B . stability C . promptness D . speed droo

  查看最佳答案

• Critical speed in diesel engines occurs when engine torque pulsations become （）

  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

  查看最佳答案

• An increase in load on a diesel engine results in （） of speed of the crankshaft.

  A . a reduction B . an increase C . an outing D . a downward

  查看最佳答案

• In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）

  A . build up the piston crown by metal spraying B . build up the cylinder head by metal spraying C . insert shims between the crankpin bearing box and the connecting rod foot D . install a thinner head gasket

  查看最佳答案

• Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.

  A . lead B . forged steel C . alloy steel D . aluminum alloy

  查看最佳答案

• While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）

  A . Manually trip the over-speed device B . Interrupt the fuel flow to the engine C . Disengage the safety interlock D . Slide the camshaft to the neutral positio

  查看最佳答案

• The required amount in the change of speed necessary before a governor will make a corrective movement is known as （）.

  A . speed droop B . sensitivity C . stability D . promptne

  查看最佳答案

• Changes in direction or speed of the main propulsion units shall be recorded, （）an Administration has determined that the size or characteristics of a particular ship make such recording impracticable.

  A . in addition to B . in addition that C . except for D . except where

  查看最佳答案

• After the ship is out of the harbour and in “Full Speed”, well change （）.

  A . to fuel oil instead of diesel oil B . for fuel oil instead of diesel oil C . to diesel oil into fuel oil D . for diesel oil into fuel oil

  查看最佳答案

• 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

  查看最佳答案

• What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）

  A . 375 RPM B . 500 RPM C . 750 RPM D . 1500 RPM

  查看最佳答案

• A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）

  A . engine overload B . leaky valves C . stuck or broken piston rings D . low air injection pressure

  查看最佳答案

• My book is______finished; I have only a few changes to make in the writing.

  A．virtually B．violently C．vertically D．visually

  查看最佳答案

• In a diesel engine, offers the heat energy directly; works as working medium and changes the heat energy to mechanical energy.

  A.the burning of the fuel; medium shaft B.fuel spray; fresh air C.fuel; fuel spray D.the burning of the fuel; the burned gas mixture

  查看最佳答案