MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2026 ALL IN ONE DOCUMENT 500 QUESTIONS AND

MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2026 ALL IN ONE DOCUMENT 500 QUESTIONS AND ( ANSWERS)

1 P a g e MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2026 ALL IN ONE DOCUMENT 500 QUESTIONS AND ( ANSWERS) 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 ope 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