MACHINIST MATE EXAM
What is the purpose of the gland dealing system? – ANSWER- It
prevent steam from leaking out of the main engine and from air
entering
How are flanges installed in a non ferrous system? – ANSWERBrazing
How often are fuel tanks emptied to reduce heavy sludge
deposits? – ANSWER- Every 12 months
What lubricated corrugated ribbon packing? – ANSWERGraphite
What must be done to lube oil coolers that are online more than
24 hours? – ANSWER- Drain seawater side
What material are oil deflectors made from? – ANSWERAluminum or bronze
DFT will maintain dissolved oxygen context at or below what
level? – ANSWER- 15 ppm
What fuel oil test uses hydrazine? – ANSWER- API gravity
What device is installed on main engine to prevent leakage or
steam from engine? – ANSWER- Labyrinth packing
If rotary pumps are operated at higher than normal speed what
will occur? – ANSWER- Erosion and excessive wear
When shall safety valve gauge be placed on boiler prior to safety
settings? – ANSWER- When steam drum pressure is 100 to 200
psi below lower valve settings or 75% or working pressure,
whichever is higher
To obtain max effective sealing of labyrinth packing the tip
width of packing teeth should be maintained within what
parameter? – ANSWER- .010″
Idle line shaft bearing oil must be sampi 60 At what periodicity?
- ANSWER- Weekly
Transverse diametrical pitch of reduction gear – ANSWERRatio of number of teeth to number of inches of pitch diameter
What type of reduction gear would you expect to find in aux
type shop? – ANSWER- Tandem articulated
Double reduction
With one or more inputs
Typical end play with cold engine is what? – ANSWER- .008-
.014″
What type of gauge is used to measure clearance between high
pressure and low pressure turbines? – ANSWER- Taper gauge
Chloride is an indication of what type of contamination? –
ANSWER- Sea water
How are steel flanges installed in systems? – ANSWERWelding
What type of corrosion is caused by shore water contamination?
- ANSWER- Caustic
Max silica content of shore source feed water – ANSWER- .20
ppm
What is primary source of silica contamination? – ANSWERPoor quality shore feed water
Which dishwasher is fully automatic? – ANSWER- 3 tank
machine
Max moisture content of an oil sample drown from centrifugal
compressor? – ANSWER- 100ppm
Main condenser is what type of heat exchanger? – ANSWERCross flow
When stripping fuel oil tanks, system is aligned to draw off how
many gallons of fuel? – ANSWER- 150-300 gallons
Time limit on sodium nitrate wet lay up? – ANSWER- No time
limit
What device is installed on main engine thrust bearing to
indicate flow? – ANSWER- Sight flow indicator
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