9-9.
By taking which of the following steps can
you help prevent an explosion in an air
compressor?
1.
Ensure that intake air is cool, dry
and free of dust
2.
Clean intake filters with a strong
solution of sal soda
3.
Ensure that a relief valve is
installed between the compressor and a
stop valve
4.
All of the above
9-10.
What action should you take immediately
if air discharged from any stage in a
compressor shows an unusual temperature
rise?
1.
Open the relief valve
2.
Secure the compressor
3.
Open the pressure gages
4.
Check cooling water circulation
9-11.
A compressor is to be operated
continuously during a 6-week cruise.
Which of the following steps should you
take to prevent high operating
temperatures?
1.
Increase water circulation and
decrease speed
2.
Maintain proper water circulation
operating speed
3.
Lift relief valves by hand and
relieve pressure
4.
Blow down moisture separators and
change filters
and
Learning Objective:
Point out the
factors that contribute to safe and
proper operation of an auxiliary
boiler, and specify the symptoms
and troubles that may cause faulty
operation.
9-12.
You are lighting off the auxiliary boiler
and the blower does NOT deliver the
proper amount of air.
Which of the
following conditions should you eliminate
as a possible cause of the difficulty?
1.
Clogged or dirty burner tip
2.
Insufficient or fluctuating voltage
3.
Bent shaft or slipping V-belts
4.
Broken shaft or dirty fan blades
In questions 9-13 through 9-15, which are
related to troubleshooting auxiliary boilers,
select the condition from column B that may
cause the symptom or difficulty listed in column
A.
A.
Symptoms or
B.
Conditions
Difficulties
9-13.
Excessive vibration
1.
Dirty or
clogged burner
9-14.
Feed pump fails to
tip
deliver
2.
Leak in
9-15.
Ignition failure
suction line
3.
Fluctuating
voltage
4.
Insufficient
air to the
burner
9-16.
Failure of feedwater pumps to deliver
water may be caused by which of the
following conditions?
1.
Malfunction of programming control
cams
2.
Dynamic unbalance of rotating
elements
3.
Jammed or worn impellers
4.
Each of the above
Learning Objective: Identify boiler
water problems, sources of
contamination, and boiler water
treatment for controlling them.
9-17.
In an auxiliary boiler, deposits on the
watersides of boiler tubes may cause
which of the following problems?
1.
Oxidization
2.
Vibration
3.
Overheating
4.
Embrittlement
Question 9-18 is to be judged True or
False.
9-18.
In auxiliary boilers, the pH of the boiler
water is measured instead of the
alkalinity because the higher pH level can
be more easily measured by the pH meter
test.
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