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EN-MIEA / SMM, OM1 / 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 — 12_MIAE — EN-MIEA / SMM, OM1 / 4” contains 26 questions across 1 collection.

Learning

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Sample questions and answers

These examples come from the published collection. Choose Learning to study questions in sequence, or Exam to check your knowledge.

If there is a reduction in the normally supplied frequency to a 120/240 volt, three-phase AC current motor from 60 hertz to 55 hertz, the motor would

One correct answer

  • run at a slower speed✓ Correct answer
  • operate at a lower current
  • vibrate excessively
  • trip off the line
Compressed air should not be used to clean motor controller equipment because

One correct answer

  • it may force metallic particles into coil insulation✓ Correct answer
  • the surrounding area may need additional cleaning
  • the air blast dries out insulation quickly
  • a mask and respirator would be required
In an AC generator, direct current from a separate source is passed through the windings of the rotor

One correct answer

  • by means of slip rings and brushes✓ Correct answer
  • by means of a commutator
  • by means of rotating bar magnet
  • to minimize the danger of arc over
An advantage of DC motors over AC motors is that they

One correct answer

  • are less expensive
  • require less maintenance
  • can be started across the line
  • offer a more effective means of controlling speed✓ Correct answer
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

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