Read the three technical maintenance excerpts below. Match each technical excerpt to the statement that directly expresses its explicit main idea.
- Lead-acid storage batteries require regular specific gravity testing of their electrolyte to accurately determine their state of charge. Technicians use a hydrometer to sample the sulfuric acid solution from each individual battery cell. As a battery discharges, sulfate ions leave the liquid and bind to lead plates, decreasing electrolyte density. Measuring this fluid density provides a direct and reliable assessment of remaining electrical energy.Regular specific gravity testing of battery electrolyte is necessary to determine state of charge accurately.
- Routine torque wrench calibration is essential for ensuring that mechanical fasteners deliver the precise clamping force required for structural integrity. Over repeated mechanical cycles, internal spring tension and ratcheting mechanisms experience measurement drift. If tools are not routinely tested against certified transducers and adjusted to standard tolerances, under-torqued bolts may loosen under operational vibration or over-torqued fasteners may suffer premature shear failure.Routine torque wrench calibration is essential to ensure fasteners maintain proper clamping force and structural integrity.
- Electrically heated pitot-static probes prevent ice accumulation that compromises critical airspeed and altitude flight instrumentation. During flight through freezing moisture or sub-zero clouds, ice buildup can rapidly obstruct the forward dynamic pressure port and lateral static ports. Internal resistive heating elements continuously maintain exterior surface temperatures above freezing, ensuring clear airflow and reliable instrument data.Electrically heated pitot-static probes prevent ice formation that compromises critical flight instrumentation.
Answer
The excerpt discussing battery electrolyte matches the statement regarding specific gravity testing for state of charge; the excerpt on torque wrench calibration matches the statement regarding maintaining proper fastener clamping force; and the excerpt on heated pitot-static probes matches the statement regarding preventing ice formation on flight instrumentation.
Each excerpt contains a clearly identifiable explicit topic sentence at its beginning that summarizes the central purpose and scope of the text. The statement regarding electrolyte specific gravity directly matches the core focus of the battery passage; the statement regarding calibration for clamping force directly matches the torque wrench passage; and the statement regarding ice prevention on flight instruments directly matches the pitot-static probe passage.
Step-by-Step Solution
Key Concept
Identifying an explicitly stated topic sentence that captures the primary claim and complete scope of an expository paragraph.
Estimated Time:1m 30s