- | P a g e
Engineering BDOC exam, Basic Officer Course, military engineering test, BDOC questions and answers, officer training exam, engineering leadership,
BDOC 2025
What are some examples of non-positive displacement pumps? - ANSWER-- propeller
- jet
- centrifugal
- multi-stage
What is a conductor? - ANSWER-material with excess free electrons which allows the flow of electrical current
What is resistance? - ANSWER-Symbol "Omega"; opposition to free flow of current; measured in ohms
What is current? - ANSWER-Symbol "I"; flow of electrons from source to lead
- / 3
- | P a g e
What type of electricity is generated on-board most ships? - ANSWER-450V, 60Hz, 3 phase electricity
What type of electricity is generated on-board a carrier? - ANSWER-4160V, 60Hz, 3 phase electricity
What is the use of 400Hz? - ANSWER-most electronics (fire control and sonar) use 440V, 400Hz, 3 phase electricity
What is a prime mover? - ANSWER-provides mechanical energy to generate electrical energy in the generator
What are 3 examples of prime movers? - ANSWER-- Steam turbine
- Gas turbine
- Diesel engine
What types of fuel are used on-board ships? - ANSWER-- F-44 (JP-5) Kerosene type
- Fuel System Icing Inhibitor
(FSII)
- Depresses freezing point to 2 / 3
- | P a g e
-43F
- F-76 (primary)
- Gasoline type fuel used for
propulsion
Where is fuel stored? - ANSWER-in Service Tanks (ballasting tanks allow ship to maintain stability as fuel levels decrease)
How is fuel transferred? - ANSWER-using fuel oil transfer pumps (centrifugal)
Describe the fuel oil service system. - ANSWER-2 service tanks and 2 service pumps
How is fuel oil purified? - ANSWER-fuel oil transfer heater heats fuel to bring it to optimum temperature, F/O purifier centrifugal pump
When is fuel tested? - ANSWER-- during receipt of fuel at beginning, middle, and endpoint and every 15 minutes
- / 3