USCG General Engineering 3

Question 1

What is the primary purpose of a ship's oily water separator (OWS)?

Accepted Answer

To separate oil from bilge water before discharge overboard

Answer

An OWS removes oil from bilge water so the effluent meets the 15 ppm standard required by MARPOL Annex I before discharge.

Question 2

What is the correct procedure when a relief valve on a high-pressure system lifts unexpectedly?

Accepted Answer

Shut down the system and investigate the cause before restarting

Answer

An unexpected relief valve lift signals an overpressure condition; the system must be shut down and the root cause identified to prevent equipment damage or injury.

Question 3

Which bearing type is most commonly used for a ship's main propulsion shaft?

Accepted Answer

White metal (babbitt) journal bearing

Answer

White metal (babbitt) journal bearings are used for main propulsion shafts because they can carry large radial loads and are self-lubricating with oil or water.

Question 4

What does a 'load cell' measure in marine engineering applications?

Accepted Answer

Force or weight applied to a structural member

Answer

A load cell is a transducer that converts mechanical force or weight into an electrical signal, used in applications like mooring line tension monitoring.

Question 5

What is the function of a 'stern tube' on a vessel?

Accepted Answer

Houses the propeller shaft where it passes through the hull

Answer

The stern tube is a watertight housing that supports and seals the propeller shaft as it passes through the vessel's hull.

USCG - United States Coast Guard Practice Test

USCG - United States Coast Guard Practice Test

USCG General Engineering 3