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EN-IEB.AEN / OE2, OE3 / 4

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About this collection

The ANR bank contains many sets with original names and codes, including navigation, safety and equipment topics. Select a module by name or use question search.

“ANR — IEB.AEN-Operational — EN-IEB.AEN / OE2, OE3 / 4” contains 21 questions across 1 collection.

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Sample questions and answers

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For more complete vessel protection when using an impressed current cathodic system

One correct answer

  • all ship's service alternators have additional temperature sensing devices and a thermal recorder installed
  • machinery on deck and in the engineroom is first coated with zinc chromate before final painting
  • the hull's magnetic fields are aligned with a solid-state degaussing circuit using SCR's
  • straps connect the rudder with the hull and the propeller shaft is grounded through a slip ring/brush arrangement✓ Correct answer
When reading electrical motor controller diagrams, it helps to know that

One correct answer

  • current paths in the control circuit are drawn as heavy lines and in the power circuit as lighter lines
  • current paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines✓ Correct answer
  • circuits subject to 500 volts or greater are drawn as heavy lines and below 500 volts as lighter lines
  • circuits subject to 500 volts or greater are drawn as light lines and below 500 volts as heavy lines
If a small electric motor has been submerged in saltwater for a short period of time, you should

One correct answer

  • send it ashore for rewinding
  • rinse it with warm freshwater and bake it dry in an oven✓ Correct answer
  • soak it in a bucket of commercial solvent and bake with internal heat
  • clean it with carbon tetrachloride and blow it out with compressed air
What precaution should be taken with a vessel's impressed current cathodic protection system after a drydocking period during which the hull has been painted?

One correct answer

  • Output currents should be carefully monitored to assure operation at nearly 100 % capacity for proper curing.
  • Reference cell voltages should be maintained at half the normal range for approximately 48 hours.
  • The unit should remain off for the specified amount of time so as not to disturb curing.✓ Correct answer
  • A slight (10-15%) overcurrent to the anodes should be allowed in order to speed drying.
The illustrated EL-0024 circuit is a wheatstone bridge If the meter "G" reads 0 with the switch closed then

One correct answer

Question illustration
  • the current through R1 - R2 is equal to the current through R3 - Rx✓ Correct answer
  • the voltage across b - d is equal to the voltage of E
  • the resistance of Rx is equal to the resistance of R2
  • all the above are true

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