Examkin

Question

Difficulty: HardInferring Author Purpose and Intent

Early aviators relied almost exclusively on mechanical gyrocompasses to maintain heading across featureless terrain. While these instruments operated independently of the Earth's magnetic distortions, their internal spinning rotors were notoriously vulnerable to mechanical precession—a gradual drift caused by bearing friction and the Earth's rotation. Flight crews had to manually reset the gyros against known magnetic bearings at regular intervals during flight. Modern inertial reference units have largely replaced mechanical gyros by utilizing ring laser technology, which detects phase shifts in counter-propagating light beams. By eliminating all moving parts, laser systems achieve continuous orientation accuracy without requiring ongoing manual recalibration.

Based on the passage, what is the author's primary purpose?

  1. A
    describe how bearing friction and the Earth's rotation cause mechanical precession in spinning rotors
  2. B
    argue that modern flight crews should maintain proficiency in manually recalibrating directional instruments
  3. explain how technological advancements resolved a persistent operational limitation in aviation navigationAnswer
  4. D
    demonstrate that optical laser technology is superior to mechanical systems in all engineering fields

Answer

explain how technological advancements resolved a persistent operational limitation in aviation navigation
The author establishes an operational problem with historical instruments (drift caused by mechanical precession in gyrocompasses) and contrasts it with a modern technological solution (ring laser systems with no moving parts that eliminate recalibration). Thus, the primary purpose is to explain how technological progress resolved an operational hurdle.

Step-by-Step Solution

1
Identify the primary problem and context presented in the first half of the passage
The text highlights that traditional mechanical gyrocompasses suffered from mechanical precession drift, requiring continuous manual corrections.
Establishing the initial limitation provides the context for why the author is discussing the topic.
2
Examine the solution and resolution introduced in the second half of the passage
The text explains that ring laser inertial reference units eliminated moving parts and solved the need for manual recalibration.
Connecting the problem to its technological solution reveals the structural flow of the author's message.
3
Synthesize the overall intent across the entire passage
The author presents a before-and-after comparison to illustrate how modern engineering overcame a critical navigational challenge.
Inferring author intent requires evaluating the complete conceptual progression rather than isolated facts.

Key Concept

Inferring Author Purpose and Intent
Estimated Time:1m 15s
Rate this question

Topics

Inferring Author Purpose and Intent

More questions from this topic