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Difficulty: Very hardDirect Fact Retrieval

Read the following technical passage regarding phased array radar calibration carefully. Then, complete the sentence by filling in the blanks strictly using the exact details provided in the text.

During calibration of the AN/FSQ-220 phased array radar, operators must strictly monitor thermal and frequency parameters. The primary coolant loop maintains a flow rate of 45.5 liters per minute at a baseline of 12°C. Should ambient temperatures exceed 38°C, an auxiliary chiller engages, dropping the baseline to 8.5°C. For RF transmission calibration, a low-band frequency sweep initiates at 1.2 GHz, demanding a stabilization period of 15 seconds before scaling to the high-band target of 8.4 GHz. Operators must document the voltage standing wave ratio (VSWR) precisely 120 seconds post-stabilization to prevent magnetron degradation.

Answer:To prevent magnetron degradation, operators must document the VSWR exactly 【120】 seconds after the initial 【15】 second stabilization period that begins at the low-band frequency of 【1.2】 GHz.

Answer

The blanks should be filled with 120 (for the documentation time), 15 (for the stabilization period), and 1.2 (for the low-band frequency).
The passage explicitly details three required facts in sequence for the calibration procedure: the VSWR is documented 'precisely 120 seconds post-stabilization', the preceding stabilization period is '15 seconds', and the entire sweep initiates at a low-band frequency of '1.2 GHz'. Accurately extracting these values without being distracted by thermal data (45.5, 12, 38, 8.5) or the high-band target (8.4) correctly completes the sentence.

Step-by-Step Solution

1
Locate the required timing for documenting the VSWR in the text.
The text states VSWR is documented 'precisely 120 seconds post-stabilization'.
This directly supplies the correct quantity for the first blank.
2
Locate the specific duration of the stabilization period.
The text mentions 'a stabilization period of 15 seconds'.
This matches the contextual requirement for the second blank.
3
Identify the numerical value associated with the low-band frequency.
The text explicitly states the low-band frequency sweep 'initiates at 1.2 GHz'.
This provides the final quantity needed for the third blank, ensuring it is not confused with the 8.4 GHz high-band target.

Key Concept

Locating and extracting precise numerical parameters from dense technical text without conflating adjacent values.
Estimated Time:2m 0s
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Topics

Direct Fact Retrieval

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