poor combustion in a diesel engine is due to
cold intake air
overhead injectors
carbon deposits on the injectors
all of the above
none of the above
Excessive oil consumption on a diesel engine could be the result of: 1. high oil temperature 2. oil diluted with fuel 3. low oil pressure 4. cracked bearings
1,2
1,2,3
2,3
3,4
1,2,3,4
High oil temperatures in a diesel engine may be caused by: 1. low cooling water temp 2. improper combustion 3. contaminated oil 4. overheated bearings
How many pumps are required in the distributer system for the injection of fuel into a large industrial diesel engine?
one
two
three
one pump for each cylinder
Where is the oil filter located in a large diesel engine lubricating oil system?
in the crankcase
on the discharge side of the oil cooler
between the oil pump and the cooler
oil pump suction line
cylinder discharge
Which systems may be used for injecting fuel into a diesel engine cylinder?
direct and indirect
solid injection system and carburetion
air injection and turbo injection
solid injection system and air injection system
common system and distributor system
A fuel injector
has a fuel injection nozzle
injects fuel and air into the cylinder
inject fuel into the cylinder during the intake stroke
heats the fuel in order to ensure complete combustion
injects fuel vapor into the cylinder
A carburetor is used to: 1. atomize the fuel 2. heat the fuel 3. produce a vacuum 4. control the fuel/air mixture 5. add carbon to the fuel 6. mix the fuel and air
1,3,5
2,4,6
1,3,4,5
1,3,4,6
The _______ ignition system produces a hotter spark at high speeds:
magnetic
coil
distributor
magneto
dynamo
The coils function in a battery ignition system is to
increase the current to the plugs
increase the voltage to the plugs
increase both the current an voltage to the plugs
increase the spark across the plugs
create a constant voltage to supply the plugs
The camshaft in a large internal combustion engine may be driven by 1. chain 2. gear 3. belt 4. fluid coupling 5. magnetic clutch 6. conduit
4,5,6
1,3,6
1,2,4
An oil priming pump on an internal combustion engine is used:
upon shutdown
before start-up
during operation
to fill the crank case
to filter the oil
Internal combustion engines that incorporate a heat exchanger cooling system are considered
an indirect cooling system
an open circuit cooling system
a closed circuit cooling system
a reverse flow cooling system
Overheating an internal combustion engine is caused by:
using the wrong oil
running at low speeds
early fuel injection
oil leaks
When cooling is inadequate on an internal combustion engine
the pistons may contract and sieze
the exhaust valves may become burned
the oil may solidify
the oil becomes progressively more viscous
