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EN-IEB.AEN / OE2, OE3 / 5

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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 — EN-IEB.AEN / OE2, OE3 / 5” contains 37 questions across 1 collection.

Learning

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Exam

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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.

Which of the following is not a characteristic of AC motors?

One correct answer

  • high torque at low speed✓ Correct answer
  • lower cost
  • less maintenance required
  • physically smaller than DC motors of the same horsepower
The timer element of a reverse power relay cannot be energized unless

One correct answer

  • one generator is fully motorized
  • the movement of the disk is damped by a permanent magnet
  • the power flow is the same as the tripping direction✓ Correct answer
  • the power flow is the opposite to the tripping direction
A strain-relief device must be provided where a cord enters an appliance. The purpose of this device is:

One correct answer

  • to provide for extra insulation between the cord and the metal case.
  • to maintain the flexibility of the cord.
  • to prevent the cord from being pulled out of the appliance.✓ Correct answer
  • to reduce the severity of a potential electric shock.
A semiconductor is a material with a

One correct answer

  • conductivity higher than a normal conductor
  • conductivity higher than a normal insulator✓ Correct answer
  • high conductivity at low temperatures
  • low conductivity at high temperatures
Which of the following statements concerning the maintenance of solid-silver contacts in relays and auxiliary control circuits is correct?

One correct answer

  • When necessary, they should always be dressed with a wire wheel.
  • They should be filed with a fine-cut file when projections extend beyond the contact surface.✓ Correct answer
  • When black silver oxide is present, it should always be removed from the contact surface with coarse sandpaper.
  • If necessary, they should be held together with moderate pressure while emery paper is drawn between the contacts.

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