MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2026 ALL IN ONE DOCUMENT 500 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+

MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2026 ALL IN ONE DOCUMENT 500 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+

1 | P a g e MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2026 ALL IN ONE DOCUMENT 500 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ 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 2 | P a g e 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 3 | P a g e 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 4 | P a g e 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