Machinist Mate Test Latest Update 2024 Version 521 Questions and Verified Correct Answers Guaranteed Success
3 subsystems of 3M? - CORRECT ANSWER:
A low boiler economizer outlet temp will have what effect on superheater outlet temp? -
CORRECT ANSWER: High super heater outlet temp
A low boiler economizer outlet temp will have what effect on superheater outlet temp? -
CORRECT ANSWER: High super heater outlet temp
a low condensate inlet pressure to DFT will have what detrimental effect on propulsion
plant? - CORRECT ANSWER: Low DFT level
Low water in boiler Improper deaeration of feedwater
a low condensate inlet pressure to DFT will have what detrimental effect on propulsion
plant? - CORRECT ANSWER: Low DFT level
Low water in boiler Improper deaeration of feedwater
A propellor that vibrates at a natural frequency is characterized by what term? -
CORRECT ANSWER: Singing
A propellor that vibrates at a natural frequency is characterized by what term? -
CORRECT ANSWER: Singing
A rateau stage on a turbine is how many sets of nozzles and rows of moving blades? -
CORRECT ANSWER: One set of nozzles and one set of moving blades
A rateau stage on a turbine is how many sets of nozzles and rows of moving blades? -
CORRECT ANSWER: One set of nozzles and one set of moving blades
A reduction gear journal bearing shows dramatic increase in temp and then decrease
to ambient temp, this is called what? - CORRECT ANSWER: Wiped bearing
A ruptured feed water control valve diaphragm will have what adverse effect on boiler
water level? - CORRECT ANSWER: Water level increase
Valve will fail open
A steam blanket lay up shall be monitored at what frequency by a responsible watch
stander? - CORRECT ANSWER: Hourly
A steamer operates at what pressure? - CORRECT ANSWER: 5-7 psi 1 / 4
After all refrigerant leaks have been found and corrected, system must hold system
pressure for what duration? - CORRECT ANSWER: Six hours with zero loss of
pressure
After all refrigerant leaks have been found and corrected, system must hold system
pressure for what duration? - CORRECT ANSWER: Six hours with zero loss of
pressure
After installing new bearings on SSTG reduction gear, what is required tooth contact? -
CORRECT ANSWER: 90%
After test flame is applied for flashpoint test, at what rate is temp increased? -
CORRECT ANSWER: In 2 degree increments until flashpoint is achieved
After test flame is applied for flashpoint test, at what rate is temp increased? -
CORRECT ANSWER: In 2 degree increments until flashpoint is achieved
After what condition, is the cause of large temp and pressure drops in the first stage
nozzles of a combination impulse and reaction turbine? - CORRECT ANSWER: A
velocity compounded impulse stage at the high pressure end of the turbine followed by reaction blading
After what condition, is the cause of large temp and pressure drops in the first stage
nozzles of a combination impulse and reaction turbine? - CORRECT ANSWER: A
velocity compounded impulse stage at the high pressure end of the turbine followed by reaction blading
Air compressors are divided into what three classes? - CORRECT ANSWER: Low
medium high
Air lock is designated to hold for what min time frame IAW PMS - CORRECT
ANSWER: 10mins
All boiler tubes are identified in what manner? - CORRECT ANSWER: Tube rows by
lettering Individual tubes in each row by numbers
All boiler tubes are identified in what manner? - CORRECT ANSWER: Tube rows by
lettering Individual tubes in each row by numbers
All current high speed compressors for refrigerant systems operate at what? -
CORRECT ANSWER: 1750 rpm
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All safety valves installed onboard naval vessels have blowdown range of what? -
CORRECT ANSWER: 3-6%
All safety valves installed onboard naval vessels have blowdown range of what? -
CORRECT ANSWER: 3-6%
An example of a final control element in 3 element feed system would be what? -
CORRECT ANSWER: Feed water control valve
An insulating block is capable of withstanding surface temp of what? - CORRECT
ANSWER: 1500 degrees
An insulating block is capable of withstanding surface temp of what? - CORRECT
ANSWER: 1500 degrees
An oil spill that Produces a sheen in United States navigable water and contiguous zone must be
reported to whom immediately? - CORRECT ANSWER: Commander of local coast
guard district
As the steam passes across the moving blades in a reaction turbine, what happens to
the pressure and velocity? - CORRECT ANSWER: They decrease
As the steam passes across the moving blades in a reaction turbine, what happens to
the pressure and velocity? - CORRECT ANSWER: They decrease
Astern turbines are normally made up of what type of staging? - CORRECT ANSWER:
Velocity compounded impulse
Astern turbines are normally made up of what type of staging? - CORRECT ANSWER:
Velocity compounded impulse
At what degrees may waterside burning occur in carbon steel tubes? - CORRECT
ANSWER: 750
At what degrees may waterside burning occur in most alloy superheater tubes? -
CORRECT ANSWER: 1,000
At what frequency are visual samples taken down during refueling ops? - CORRECT
ANSWER: Every 15mins
At what frequency are visual samples taken down during refueling ops? - CORRECT
ANSWER: Every 15mins
At what interval are main reduction gears inspected by navsea? - CORRECT ANSWER: 10 years or when conditions warrant 3 / 4
At what interval should each boiler be inspected for integrity of welds and nozzle
connections? - CORRECT ANSWER: Every 5 years
At what pressure does combination exhaust relief valve lift? - CORRECT ANSWER:
2psi above aux exhaust line pressure
At what pressure does combination exhaust relief valve lift? - CORRECT ANSWER:
2psi above aux exhaust line pressure
At what temp is dehydration process considered complete? - CORRECT ANSWER: 35
degrees
At what temp is dehydration process considered complete? - CORRECT ANSWER: 35
degrees
Automatic shutters are constructed of what? - CORRECT ANSWER: Steel or aluminum
components
Automatic shutters are constructed of what? - CORRECT ANSWER: Steel or aluminum
components
Automatic unloading valves are installed to exhaust to what major component? -
CORRECT ANSWER: Main and aux condensers
Automatic unloading valves are installed to exhaust to what major component? -
CORRECT ANSWER: Main and aux condensers
Backlash of main engine reduction gears refers to what? - CORRECT ANSWER: Gear
play between the surfaces of the teeth in mesh measured at pitch circle
Backlash of main engine reduction gears refers to what? - CORRECT ANSWER: Gear
play between the surfaces of the teeth in mesh measured at pitch circle
Because of the pressure drop existing across each diaphragm in a turbine, the flow of steam between the nozzle diaphragm and the rotor is held to a minimum by what? -
CORRECT ANSWER: A labyrinth packing ring
Because of the pressure drop existing across each diaphragm in a turbine, the flow of steam between the nozzle diaphragm and the rotor is held to a minimum by what? -
CORRECT ANSWER: A labyrinth packing ring
Boiler full power capacity will be affected if what percent of generating tubes are
plugged? - CORRECT ANSWER: >5%
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