3-9.
What is the main source of fuel
pump and injection system troubles?
1.
Contaminated fuel
2.
Improper adjustments
3.
Coated fuel lines
4.
Excessive vibration
3-10.
Metal fatigue in the nipples of a
fuel system is usually caused by
which of the following factors?
1.
Leakage
2.
High injection pressure
3.
Vibration
4.
Erosion
3-11.
What are the two main causes of
leakage in fuel tanks?
1.
Corrosion and excessive fuel
line pressure
2.
Metal fatigue and improper
welds
3.
Vibration and metal fatigue
4.
Clogged fuel lines and
corrosion
3-12.
Which of the following problems is
likely to cause failure of a diesel
engine mechanical governor?
1.
Faulty oil seals
2.
Bound control linkage
3.
Defective cold starting valve
4.
Low oil level
3-13.
Which of the following actions will
cause the overspeed safety device
of an engine to become inoperative?
1.
Trying to start the engine with
low air-starting pressure
2.
Tripping the device
accidentally while trying to
start the engine
3.
Shutting off the fuel supply
after starting the engine
4.
Shutting off the air supply
after starting the engine
3-14.
Most diesel engines are equipped
with a special means of cutting off
their air or fuel supply in an
emergency.
In which of the
following situations would the
special means be used?
1.
Engine cannot be cranked or
barred over
2.
Parts of the exhaust system are
obstructed
3.
Fuel oil injection system is
not properly timed
4.
Overspeed safety device does
not operate when speed becomes
excessive
3-15.
Slow cranking of a cold diesel
engine may be caused by the use of
which of the following substances?
1.
Detergent lube oil
2.
High viscosity lube oil
3.
Centrifuged lube oil
4.
Low viscosity lube oil
3-16.
What diesel engine system is likely
to be at fault if a cylinder
misfires regularly?
1.
Lubrication
2.
Fuel
3.
Exhaust
4.
Ignition
3-17.
A cylinder compression leak is
indicated when the pressure in a
particular cylinder of an engine
signals which of the following
conditions?
1.
It is much higher than the
pressure in the other cylinders
2.
It is much lower than the
pressure in the other cylinders
3.
It fluctuates from normal to
much below specified pressure
4.
It fluctuates from normal to
much above specified pressure
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