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Machinist Mate Test 2023 Questions and Answers with complete solution
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Machinist Mate Test 2023 Questions and Answers with complete solutionWhat NSTM deals with propulsion and SSTG Turbines? Ans- NSTM 231
Whats type of rotary pump is frequently used as a lubricanting pump on pumpe and other aux equipment? Ans- Simple gear pimp
What is the normal length of a tapered plug? Ans- 3"
What is installed on a non-condensing turbone to protect turbine casing from excessive pressure? Ans- Combination exhaust relief valve 2-3 psi above exhaust line pressure
On an SSTG, what protects turbine casing from excessive pressure? Ans- Back pressure trip
When starting an SSTG, what is a minimum lube oil temp? Ans- 60 degrees
What are the four sections of a PQS? Ans- Fundamentals, systems, watchstations, qual card
What is the number for a PMS feedback report? Ans- 4790/7B
When should oil coolers be put into operation on aux machinery? Ans- When temp of lube oil leaving cooler is 100 degrees
DFT is designed to operate at what pressure and temp? Ans- 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? Ans- Wearing rings
The federal water pollution control act was amended in what year? Ans- 1970
What is the NSTM for compressed air systems? Ans- 551
What is the max allowable pressure drop across a fuel oil duplex strainer when online? Ans- 3%
What is the NSTM for general reduction gear? Ans- 241
What is the NSTM for forced draft blowers? Ans- 554 What is the required amount of sodium nitrate used for a sodium nitrate wet lay up? Ans- 10lbs per 1,000 gallons of feed water
What is the NSTM for insulation and lagging? Ans- 635
What is QA chapter 11? Ans- QA forms and instructions
What is QA chapter 12? Ans- Submarine preservation
What is QA chapter 13? Ans- Wire removal and replacement
What is QA chapter 10? Ans- Quality assurance records
What is QA chapter 9? Ans- Audits, surveillance, evaluations and assesments
What is QA chapter 3? Ans- PQS and training
What is QA chapter 2? Ans- Quality maintenance process
What is QA chapter 4? Ans- Welder, brazer, and NDT qualifications
What is QA chapter 5? Ans- In process control
When is the current ships maintenance project verified and updated? Ans- Monthly
PMS schedules are categorized in what manner? Ans- Cycle, quarterly, weekly
Main feed pump is classified as what type of pump? Ans- Multi stage
High speed
Turbine driven
How long must the engine room/fire room operating log be kept for? Ans- 2 years
Main feed pumps are fitted with what two types of governors? Ans- Speed limiting Constant speed
the number of revolutions to major speed change is entered in what column? Ans- 3
Entries for astern pitch are preceded by what level? Ans- B
What is the max allowable super heater outlet temp during transition periods of 15mins -
1 hour on a 1200 psig D type boiler? Ans- 1020 degrees
What is the first action taken, when you are experiencing difficulty in maintaining boiler water level on an automated ship? Ans- Shift boiler feed water control to remote/manual In the engineering bell book, what does I mean? Ans- Ahead standard speed
In the engineering bell book, what does III mean? Ans- Ahead flank speed
In the engineering bell book, what does B 1/3 mean? Ans- Back 1/3 speed
In the engineering bell book, what does Z mean? Ans- Stop
In the engineering bell book, what does BF mean? Ans- Back full speed
In the engineering bell book, what does BEM mean? Ans- Back emergency speed
In the engineering bell book, what does II mean? Ans- Ahead full speed
When order received is recorded as RPM in what column? Ans- 2
What QA for is used for testing and inspection? Ans- QA form 17
Boiler high water alarm is set to what parameter Ans- +7 inches
During a white smoke casualty to a boiler, what must never be adjusted? Ans- Fuel oil header pressure
What temp is lube oil maintained on an operating main engine? Ans- 120-130 degrees
A ruptured feed water control valve diaphragm will have what adverse effect on boiler water level? Ans- Water level increase
Valve will fail open
Maximum steady state superheater outlet temp on a D type 1200 psig boiler? Ans- 1000 degrees
During loss of vacuum casualty on a main condenser, what action must be taken when vacuum decreases to 15"? Ans- Main engine must be stopped and casualty procedure
IAW EOCC
Temporary distortion of SSTG rotor numerous start/stop episodes is known as what? Ans- 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? Ans- 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 Ans- 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? Ans- 24 hours
Main engine turbine bearings are measured for wear at what normal interval? Ans- Annually
Lube oil cooler should be bypassed on operating aux turbine until discharge oil temp reaches what temp? Ans- 100 degrees
IAW EOCC procedures, what three casualties require lifting of boiler safety valves? Ans- 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? Ans- Wiped bearing
How long is the engineering log kept for? Ans- 3 years, 3120/2
How long is the engineering bell book kept for? Ans- 3 years, 3120/1
Engineering bell book symbol 1/3? Ans- Ahead 1/3 speed
Engineering bell book symbol 2/3? Ans- Ahead 2/3 speed
What type of availability is used for repairs while ship is underway? Ans- Voyage repair
availability
What does the term locked train reduction gear refer to? Ans- 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? Ans- 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? Ans- Corrugated ribbon
What are the two classes of picking and gasket joints? Ans- Moving and fixed
If damaged labyrinth picking can not be fixed due to operational commitments, how can packing be repaired? Ans- By use of chisel bar and hand chisel to straighten out teeth
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