2024 MKC SWE STUDY
QUESTIONS AND SOLUTIONS
AC evaporation ✔ans Takes place in evaporator. Refrigerant will absorb latent heat and will flash off into
vapor. Vaporized refrigerant will become supeheated
Hydro test stainless air receiver ✔ans 15 years
Hydro test carbon steel air receiver ✔ans 10 years
Hydro test Aluminum and non ferrous metal ✔ans 6 years
High pressure air systems ✔ans 1001psig to 5000psig including BAC
Medium pressure air system ✔ans 151psig to 1000psig
Low pressure air system ✔ans 150psig and below
Air compressor types ✔ans Marine duty reciprocating, scroll or screw type
Air compressor moisture separators ✔ans 125psig either metal or plastic bowl can be used. Plastic bowls
shall have threaded inserts and metal guards above 125 metal bowls are required
If air compressor oil level is too high. ✔ans Carryover could result. Discoloration or higher oil level could
indicate presence of condensed liquid
Air quality requirement for LP and MP air systems ✔ans Water not to exceed 0.0015lb water Lbs/Air
dew point 55F at 80 psig
Hydrocarbons less 50ppm
, particulate contaminant less than 5 micron
Starting air compressor ✔ans Under no load, air discharged to atmosphere via unloader valve
Diffuser removes ✔ans air and other non condensable gasses
Alway operate FOP at? ✔ans Their maximum speed, after start up throttle flow to obtain rated capacity
Ability of purifier to separate depends on what ✔ans Difference in specific gravities between materials
Centrifugal purifiers braking ✔ans only apply brake in emergencies. be sure the brake is off before
starting
For diesel engines with defined oil changes greater than or equal to 750hrs ✔ans oil sample shall be
taken minimum of 3 times not to exceed 250hrs
For engines with defined oil changes less than 750hrs ✔ans shall not be required routine sampling
unless speficied.
During regular oil sampling allow ✔ans minimum of 25hrs after oil change
On newly overhauled engine samples shall be drawn after ✔ans 10,25,50 and regular intervals after
Viscosity limits ✔ans 40 Th and 5 Dilution
Oil oxidation leads to ✔ans Increased acidity
CG NOAP is funded by ✔ans CG45
QUESTIONS AND SOLUTIONS
AC evaporation ✔ans Takes place in evaporator. Refrigerant will absorb latent heat and will flash off into
vapor. Vaporized refrigerant will become supeheated
Hydro test stainless air receiver ✔ans 15 years
Hydro test carbon steel air receiver ✔ans 10 years
Hydro test Aluminum and non ferrous metal ✔ans 6 years
High pressure air systems ✔ans 1001psig to 5000psig including BAC
Medium pressure air system ✔ans 151psig to 1000psig
Low pressure air system ✔ans 150psig and below
Air compressor types ✔ans Marine duty reciprocating, scroll or screw type
Air compressor moisture separators ✔ans 125psig either metal or plastic bowl can be used. Plastic bowls
shall have threaded inserts and metal guards above 125 metal bowls are required
If air compressor oil level is too high. ✔ans Carryover could result. Discoloration or higher oil level could
indicate presence of condensed liquid
Air quality requirement for LP and MP air systems ✔ans Water not to exceed 0.0015lb water Lbs/Air
dew point 55F at 80 psig
Hydrocarbons less 50ppm
, particulate contaminant less than 5 micron
Starting air compressor ✔ans Under no load, air discharged to atmosphere via unloader valve
Diffuser removes ✔ans air and other non condensable gasses
Alway operate FOP at? ✔ans Their maximum speed, after start up throttle flow to obtain rated capacity
Ability of purifier to separate depends on what ✔ans Difference in specific gravities between materials
Centrifugal purifiers braking ✔ans only apply brake in emergencies. be sure the brake is off before
starting
For diesel engines with defined oil changes greater than or equal to 750hrs ✔ans oil sample shall be
taken minimum of 3 times not to exceed 250hrs
For engines with defined oil changes less than 750hrs ✔ans shall not be required routine sampling
unless speficied.
During regular oil sampling allow ✔ans minimum of 25hrs after oil change
On newly overhauled engine samples shall be drawn after ✔ans 10,25,50 and regular intervals after
Viscosity limits ✔ans 40 Th and 5 Dilution
Oil oxidation leads to ✔ans Increased acidity
CG NOAP is funded by ✔ans CG45
