-
Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）
A . Low cooling water outlet temperature
B . High lube oil pressure
C . Low lube oil temperature
D . Low starting air pressure
-
In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）
A . noise coming from that air starting valve
B . continuous operation of the starting air compressor
C . zero air pressure in the air starting system
D . overheated starting air pipe to the cylinder head
-
In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）
A . improve skirt lubrication
B . allow for expansion
C . transmit forces evenly
D . improve the piston seal
-
Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）
A . corrosion fretting
B . insufficient lubrication
C . abnormal wear
D . fatigue failure
-
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A . slightly acidic condition
B . slightly alkaline condition
C . overtreatment of water
D . neutral condition of water
-
Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
A . an increased flash point
B . higher lube oil pressures
C . an increased viscosity
D . lower lube oil pressure
-
A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）
A . ignition lag
B . engine horsepower
C . lube oil system pressure
D . specific fuel consumptio
-
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
A . Spark plug
B . Heat of compression
C . Carburetor
D . Glow ping
-
Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A . open the bypass line
B . cut in the lube oil cooler
C . pressurize the lube oil system
D . top off the expansion tank
-
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
-
When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）
A . maintain higher than normal jacket water temperature
B . change the lube oil more frequently than normal
C . maintain a higher air-box temperature than normal
D . maintain a higher air-box pressure than normal
-
In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs （）
A . once every crankshaft revolution
B . once every two crankshaft revolutions
C . once every piston stroke
D . twice every piston stoke
-
Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）
A . later and close sooner
B . sooner and close later
C . sooner and close sooner
D . later and close later
-
In an operating diesel engine, pre-ignition can be caused by （）
A . excessively late fuel injection
B . oil in the air charge
C . water in the fuel
D . injection continuing after the fuel charge is ignited
-
A turbocharged diesel engine will have an intake manifold pressure（）
A . constantly decreasing as engine load increase
B . constantly increasing as the amount of supercharging increases
C . approximately equal to exhaust manifold pressure at all times
D . approximately equal to atmospheric pressure at all time
-
The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）
A . expansion of the combustion gases
B . exhaust and intake valves just closing
C . maximum compression is just being attained
D . fuel injection occurring at that point and combustion begi
-
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
-
Lubricating oil viscosity in an operating diesel engine can be reduced by（）
A . increasing cooling water flow
B . increasing lube oil flow
C . dilution by fuel oil
D . adding SAE 70 oil
-
A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）
A . loss of additives from the lube oil
B . carbon deposits in the lube oil
C . excessive centrifuging
D . excessive fuel dilutio
-
A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）
A . feel the high pressure fuel line
B . check the cylinder exhausts for white smoke frequently
C . check the cylinder exhaust temperature
D . isolate each cylinder and inspect the injector
-
Diesel engine exhaust noise can be reduced in an exhaust muffler by （）
A . changing the direction of exhaust gas flow
B . increasing the exhaust gas velocity
C . changing the exhaust gas weight
D . increasing the exhaust gas static pressure
-
Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）
A . Faulty turbocharger turbine diffuser ring
B . Faulty turbocharger compressor ring
C . Insufficient cooling water flow
D . Clogged air intake filter
-
In a diesel engine, blow-by（）
A . increase exhaust back pressure
B . causes excessive crankcase pressure
C . can only be detected by a compression check
D . decreases fuel consumptio
