ENGINEERING BDOC EXAM 2025 WITH
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|FREQUENTLY TESTED QUESTIONS AND
SOLUTIONS |ALREADY GRADED A+|LATEST
UPDATE |GUARANTEED PASS
Describe the fuel test.
- Clear and Bright
- Clear (clear as mud...check
for sediment)
- Bright (checked for
haziness...indication of
water)
- API/Specific Gravity
- Weight of fuel vs weight of
water at 60F
- Flashpoint Test
- Fuel is heated in a closed
cup at a specified rate until
a flash is detected
What type of oil is used on-board ships?
2190 aka Steam Turbine Lubricating Oil
What are the uses of 2190 oil?
- steam turbines
- lubricating MRGs
1|Page
,- low, medium, and high
pressure air compressors
What are the L/O testing requirements for equipment with online purification?
- Clear and Bright
- Purifier Efficiency Test
- Inlet vs Outlet
What are the L/O testing requirements for equipment without online purification?
- Clear and Bright (visible test)
- Transparency Test
- Visible Sediment Test
- Bottom Sediment and Water
Test (centrifuge spin)
What is the purpose of the lube oil system?
to store, transfer, purify, and preheat lube oil for the MRG and CRP system
How is lube oil cooled?
by seawater
How many shafts and engines are on-board most ships?
2 shafts and 4 engines
On DDGs and CGs which shaft is the longest?
Starboard
Describe the power transmission configuration.
- Engines
- MRG
- Reduced high speed/low
torque into low speed/high
torque
- Shaft
- Propeller
What are the purpose of bearings?
to support and prevent sagging
2|Page
, What are the 4 types of shaft bearings?
- main thrust
- line (spring) bearing
- Stern tube bearing
- strut bearing
What are the purpose of main thrust bearings?
- absorb axial thrust
- an example is Kingsbury
What are the purpose of line shaft bearings?
- provide radial support
- lubricated by 2190 from its
own sumps
What are the purpose of the stern tube bearings?
- provide radial support
- located aft
- cooled and lubricated by seawater
What are the purpose of strut bearings?
- supports end of shaft
- cooled and lubricated by seawater
- similar to stern tube bearing
What is the only reference for tag-outs?
The Tag-Out User's Manual (TUM)
What is the purpose of tag-outs?
to prevent/mitigate the operation of equipment for maintenance when the equipment is
unreliable or performing abnormally
What is difference between caution and danger tags?
Caution:
- yellow
- must provide temporary
special instructions
- hung as a precautionary method
3|Page
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|FREQUENTLY TESTED QUESTIONS AND
SOLUTIONS |ALREADY GRADED A+|LATEST
UPDATE |GUARANTEED PASS
Describe the fuel test.
- Clear and Bright
- Clear (clear as mud...check
for sediment)
- Bright (checked for
haziness...indication of
water)
- API/Specific Gravity
- Weight of fuel vs weight of
water at 60F
- Flashpoint Test
- Fuel is heated in a closed
cup at a specified rate until
a flash is detected
What type of oil is used on-board ships?
2190 aka Steam Turbine Lubricating Oil
What are the uses of 2190 oil?
- steam turbines
- lubricating MRGs
1|Page
,- low, medium, and high
pressure air compressors
What are the L/O testing requirements for equipment with online purification?
- Clear and Bright
- Purifier Efficiency Test
- Inlet vs Outlet
What are the L/O testing requirements for equipment without online purification?
- Clear and Bright (visible test)
- Transparency Test
- Visible Sediment Test
- Bottom Sediment and Water
Test (centrifuge spin)
What is the purpose of the lube oil system?
to store, transfer, purify, and preheat lube oil for the MRG and CRP system
How is lube oil cooled?
by seawater
How many shafts and engines are on-board most ships?
2 shafts and 4 engines
On DDGs and CGs which shaft is the longest?
Starboard
Describe the power transmission configuration.
- Engines
- MRG
- Reduced high speed/low
torque into low speed/high
torque
- Shaft
- Propeller
What are the purpose of bearings?
to support and prevent sagging
2|Page
, What are the 4 types of shaft bearings?
- main thrust
- line (spring) bearing
- Stern tube bearing
- strut bearing
What are the purpose of main thrust bearings?
- absorb axial thrust
- an example is Kingsbury
What are the purpose of line shaft bearings?
- provide radial support
- lubricated by 2190 from its
own sumps
What are the purpose of the stern tube bearings?
- provide radial support
- located aft
- cooled and lubricated by seawater
What are the purpose of strut bearings?
- supports end of shaft
- cooled and lubricated by seawater
- similar to stern tube bearing
What is the only reference for tag-outs?
The Tag-Out User's Manual (TUM)
What is the purpose of tag-outs?
to prevent/mitigate the operation of equipment for maintenance when the equipment is
unreliable or performing abnormally
What is difference between caution and danger tags?
Caution:
- yellow
- must provide temporary
special instructions
- hung as a precautionary method
3|Page
