更多"When restarting a heavy fuel diesel"的相关试题:
[单项选择]One engine manufacturer recommends heavy fuel oil should not be heated above 80℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against（）
A. flattening of the bowl neoprene O-rings
B. operation within the explosive rang of the fuel
C. excessive purifier operating pressures
D. excessive oil viscosity
[单项选择]In a diesel engine, when the fuel is injected into the cylinder,（）
A. the piston is just coming upward from the bottom dead center
B. the piston has moved about one-fifth of the way up
C. the piston has moved most of the way up and almost reached the TDC
D. the piston has just past the TDC
[单项选择]When fuel is injected late into a diesel engine cylinder,（）.
A. the exhaust will be clear
B. fuel consumption will be low
C. all the fuel will be burned at top dead center
D. fuel consumption will be high
[单项选择]When fuel is injected in a diesel engine cylinder too early, （）
A. ignition may be delayed
B. fuel economy is not affected
C. exhaust gas temperature will be unchanged
D. the exhaust will be clear
[单项选择]When fuel enters the crankcase of a diesel engine, it （）
A. dilutes the lube oil and reduces its viscosity
B. forms sulfuric acid in the lube oil
C. causes pitting and failure of the bearings
D. causes sludge deposits on valve stems
[单项选择]Heavy residual fuel oils are heated prior to centrifuging to （）
A. reduce fuel weight
B. increase specific gravity
C. separate fuel from lube oil
D. reduce fuel viscosity
[单项选择]
When centrifuging heavy fuel oil, an important factor to consider is the （）
(1) flow rate
(2) viscosity of the fuel oil
A. (1) only is correct
B. (2) only is correct
C. both (1) and (2) are correct
D. neither (1) or (2) are correct
[单项选择]Heavy fuel oils when spilled are（）.
A. more harmful to sea life than lighter oils
B. easier to clean up than lighter refined oils
C. less harmful to sea life than lighter oils
D. not a real threat to marine life
[单项选择]When the heavy fuel oil is heated to achieve the viscosity of 10-15 cst, may occur.To avoid this, a system is used in most occasions（）
A. boiling and cavitations; low temperature
B. boiling and cavitations; pressurized
C. leaking and boiling; low temperature
D. leaking and boiling; pressurized
[单项选择]In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）
A. low firing pressure
B. low exhaust temperature
C. mechanical knock in each cylinder
D. fuel knock in each cylinder
[单项选择]In a common rail engine, the fuel is injected into cylinders（）
A. by injection pumps
B. at a time decided by the injection pump timing
C. by a signal opening the magnetic valves
D. at a time decided by the cam directly
[单项选择]When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?（）
A. Quantity of fuel injected tends to be decreased
B. Quantity of fuel injected will always be increased
C. Start of injection tends to be advanced
D. Duration of injection will always greater
[单项选择]When preparing a ship for heavy weather，fuel oil day tanks should be（）.
A. pumped overboard to calm the seas
B. drained to the lower hull to reduce free surfaces
C. filled to ensure that sufficient fuel oil is available during a lengthy emergency
D. partially drained to increase free surfaces in order to reduce motions
[单项选择]
When fuel oil is accidentally missed with lube oil which of the following processes can be used to separate them?（）
Ⅰ.filtering
Ⅱ.settling
A. Ⅰ only
B. Ⅱ only
C. either Ⅰ or Ⅱ
D. neither Ⅰ or Ⅱ
[单项选择]When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
A. filter to remove the fuel oil
B. use the settler to remove the fuel oil
C. remove the fuel oil by centrifuging
D. drain and then renew the lube oil supply
[单项选择]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A. cold corrosion of the nozzles
B. fuel viscosity for better atomization
C. carbon accumulation on the nozzles
D. fuel detonation in the cylinders
[单项选择]Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）
A. Glazing of the cylinder liners
B. Increase valve wear
C. Excessive oil pumping
D. Increase fuel consumption
[单项选择]
In a diesel engine, when refitting piston rings you should （）
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.
A. why
B. which
C. in which
D. on which
