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MACHINIST MATE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2024
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MACHINIST MATE EXAM, PRACTICE EXAM AND STUDYGUIDE NEWEST 2024 ALL IN ONE DOCUMENT 500
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
What NSTM deals with propulsion and SSTG Turbines? - ANSWER: NSTM 231
Whats type of rotary pump is frequently used as a lubricanting pump on pumpe and
other aux equipment? - ANSWER: Simple gear pimp
What is the normal length of a tapered plug? - ANSWER: 3"
What is installed on a non-condensing turbone to protect turbine casing from
excessive pressure? - ANSWER: Combination exhaust relief valve 2-3 psi above
exhaust line pressure
On an SSTG, what protects turbine casing from excessive pressure? - ANSWER: Back
pressure trip
When starting an SSTG, what is a minimum lube oil temp? - ANSWER: 60 degrees
What are the four sections of a PQS? - ANSWER: Fundamentals, systems,
watchstations, qual card
What is the number for a PMS feedback report? - ANSWER: 4790/7B
When should oil coolers be put into operation on aux machinery? - ANSWER: When
temp of lube oil leaving cooler is 100 degrees
DFT is designed to operate at what pressure and temp? - ANSWER: 15 psi and 240-
250 degrees
What is installed on a centrifugal pump to eliminate renewing of an entire propellor
and pump casing due to rapid wear? - ANSWER: Wearing rings
The federal water pollution control act was amended in what year? - ANSWER: 1970
What is the NSTM for compressed air systems? - ANSWER: 551
What is the max allowable pressure drop across a fuel oil duplex strainer when
online? - ANSWER: 3%
What is the NSTM for general reduction gear? - ANSWER: 241
What is the NSTM for forced draft blowers? - ANSWER: 554
,What is the required amount of sodium nitrate used for a sodium nitrate wet lay up?
- ANSWER: 10lbs per 1,000 gallons of feed water
What is the NSTM for insulation and lagging? - ANSWER: 635
What is QA chapter 11? - ANSWER: QA forms and instructions
What is QA chapter 12? - ANSWER: Submarine preservation
What is QA chapter 13? - ANSWER: Wire removal and replacement
What is QA chapter 10? - ANSWER: Quality assurance records
What is QA chapter 9? - ANSWER: Audits, surveillance, evaluations and assesments
What is QA chapter 3? - ANSWER: PQS and training
What is QA chapter 2? - ANSWER: Quality maintenance process
What is QA chapter 4? - ANSWER: Welder, brazer, and NDT qualifications
What is QA chapter 5? - ANSWER: In process control
When is the current ships maintenance project verified and updated? - ANSWER:
Monthly
PMS schedules are categorized in what manner? - ANSWER: Cycle, quarterly, weekly
Main feed pump is classified as what type of pump? - ANSWER: Multi stage
High speed
Turbine driven
How long must the engine room/fire room operating log be kept for? - ANSWER: 2
years
Main feed pumps are fitted with what two types of governors? - ANSWER: Speed
limiting
Constant speed
the number of revolutions to major speed change is entered in what column? -
ANSWER: 3
Entries for astern pitch are preceded by what level? - ANSWER: B
What is the max allowable super heater outlet temp during transition periods of
15mins - 1 hour on a 1200 psig D type boiler? - ANSWER: 1020 degrees
,What is the first action taken, when you are experiencing difficulty in maintaining
boiler water level on an automated ship? - ANSWER: Shift boiler feed water control
to remote/manual
In the engineering bell book, what does I mean? - ANSWER: Ahead standard speed
In the engineering bell book, what does III mean? - ANSWER: Ahead flank speed
In the engineering bell book, what does B 1/3 mean? - ANSWER: Back 1/3 speed
In the engineering bell book, what does Z mean? - ANSWER: Stop
In the engineering bell book, what does BF mean? - ANSWER: Back full speed
In the engineering bell book, what does BEM mean? - ANSWER: Back emergency
speed
In the engineering bell book, what does II mean? - ANSWER: Ahead full speed
When order received is recorded as RPM in what column? - ANSWER: 2
What QA for is used for testing and inspection? - ANSWER: QA form 17
Boiler high water alarm is set to what parameter - ANSWER: +7 inches
During a white smoke casualty to a boiler, what must never be adjusted? - ANSWER:
Fuel oil header pressure
What temp is lube oil maintained on an operating main engine? - ANSWER: 120-130
degrees
A ruptured feed water control valve diaphragm will have what adverse effect on
boiler water level? - ANSWER: Water level increase
Valve will fail open
Maximum steady state superheater outlet temp on a D type 1200 psig boiler? -
ANSWER: 1000 degrees
During loss of vacuum casualty on a main condenser, what action must be taken
when vacuum decreases to 15"? - ANSWER: Main engine must be stopped and
casualty procedure IAW EOCC
Temporary distortion of SSTG rotor numerous start/stop episodes is known as what?
- ANSWER: Bowed rotor
, Whenever a propulsion turbine casing joint is opened for any reason, a final contact
check is required by taking a red and blue check of the made up joint, what is the
required contact for non pumping groove joints? - ANSWER: 75% contact over entire
joint, 1/4" minimum continuous contact inside the groove and across each pressure
section
What is the function of staff packing on SSTG - ANSWER: Prevent leakage of stem
from ingress of air into turbines
Prior to conducting thrust measurements on a main engine, turbine must be at
ambient temp with throttles shit for how long? - ANSWER: 24 hours
Main engine turbine bearings are measured for wear at what normal interval? -
ANSWER: Annually
Lube oil cooler should be bypassed on operating aux turbine until discharge oil temp
reaches what temp? - ANSWER: 100 degrees
IAW EOCC procedures, what three casualties require lifting of boiler safety valves? -
ANSWER: Ruptured boiler tube
Low water in boiler
Major uncontrolled flooding
A reduction gear journal bearing shows dramatic increase in temp and then decrease
to ambient temp, this is called what? - ANSWER: Wiped bearing
How long is the engineering log kept for? - ANSWER: 3 years, 3120/2
How long is the engineering bell book kept for? - ANSWER: 3 years, 3120/1
Engineering bell book symbol 1/3? - ANSWER: Ahead 1/3 speed
Engineering bell book symbol 2/3? - ANSWER: Ahead 2/3 speed
What type of availability is used for repairs while ship is underway? - ANSWER:
Voyage repair availability
What does the term locked train reduction gear refer to? - ANSWER: 2 first reduction
pinions are locked between first two reduction gears and transmit power from the
turbine equally to two gears
What is the purpose of the diffuser? - ANSWER: Provides primary mixing of fuel
droplets with air and prevents blowing flake away from the atomizer
What type of packing is constructed from 100% graphite? - ANSWER: Corrugated
ribbon
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