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A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from ()
A . low lube oil temperature
B . low starting air temperature
C . air in the fuel injection
D . water in the starting air system
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An indication of a diesel engine air intake being partially clogged, is ().
A . low firing pressure and low exhaust temperatures
B . low firing pressure and normal exhaust temperatures
C . high firing pressure and low exhaust temperatures
D . high firing pressure and high exhaust temperature
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A diesel engine piston ring face is in direct contact with the ().
A . top of the ring groove
B . cylinder liner oil film
C . bottom of the ring groove
D . back of the ring groove
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The main purpose of inspection for a running diesel engine is()
A . testing for the mechanical load and the thermal load
B . inspecting thermal and mechanical condition of the engine
C . inspecting each system and exhaust temperature
D . testing for compress pressure and explosion pressure
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Successful combustion inside the cylinders of a diesel engine is dependent upon ().
A . fine atomization
B . high temperature
C . good mixing of fuel and air
D . all of the above
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In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called ()
A . injection lag
B . ignition delay
C . compression
D . turbulence lag
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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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Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished()
A . during the valve overlap period
B . with only the exhaust valve open
C . at a pressure below atmospheric
D . without cooling the cylinders or pisto
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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
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The purpose of the flywheel of a diesel engine is to ().
A . counterbalance the crank throws on the crankshaft
B . keep the engine running smoothly between power stroke
C . provide a belt-driving surface for the operation of auxiliary machinery
D . prevent the engine from overspeeding
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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
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When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the()
A . starting air pressure
B . scavenge air pressure
C . over-speed trip
D . banjo oiler line
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What is the best indication of the loading of a diesel engine?()
A . Oil temperature
B . Manifold pressure
C . Exhaust gas temperature
D . Fuel consumptio
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When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be ()
A . an obstruction in an cylinder
B . water accumulation in some engine cylinders
C . low starting air pressure
D . low scavenge air pressure
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Fuel is ignited in a diesel engine cylinder by ()
A . a spark plug
B . injectors
C . the heat of compression
D . increasing jacket water temperature
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A diesel engine is supercharged in order to()
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
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Fuel is admitted to a diesel engine cylinder through the ().
A . intake valves
B . carburetor
C . exhaust ports
D . injector nozzle
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Low compression pressure in a diesel engine is caused by()
A . low water in the expansion tank
B . improperly seated valves
C . low fuel oil pressure
D . worn or broken cylinder liner sealing ring
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The diesel engine is a type of ().
A、A. turbine engine
B、B. gas turbine
C、C. steam engine
D、D. internal combustion engine
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If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be ()
A . excessive compression pressure
B . air in the fuel lines
C . high fuel pressure
D . excessive load
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A diesel engine is similar to a gasoline engine except that the former has no ().
A . cross-head
B . cylinder
C . connecting rod
D . spark plug
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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 hul
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A disadvantage of a four-stroke/cycle diesel engine is ()
A . higher working temperature of piston and cylinder
B . the use of scavenge ports
C . fewer power strokes per revolution of the crankshaft
D . part of the fuel is burned as the piston is moving away from top dead center
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The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.
A.principle
B.principal
C.cause
D.case