SIFT Reading Comprehension 3 — Questions and Answers
Question 1: Passage: 'Ground effect occurs when a helicopter operates within approximately one rotor diameter of the ground. In ground effect, the helicopter requires less power to hover because the rotor downwash is interrupted by the ground surface, increasing lift efficiency.' Why does hovering in ground effect require less power?
- The engine operates more efficiently at low altitudes
- The ground interrupts rotor downwash, increasing lift efficiency (Correct answer)
- Gravity is reduced near the earth's surface
- The rotor blades spin faster when close to the ground
Correct answer: The ground interrupts rotor downwash, increasing lift efficiency
The passage explains that in ground effect, the ground interrupts rotor downwash, increasing lift efficiency and reducing the power needed to hover.
Question 2: Read: 'A passage's main idea is not always stated explicitly in the first sentence. Skilled readers identify the main idea by considering which idea all other sentences support or develop, regardless of where that idea appears in the text.' What is the best method for identifying a passage's main idea according to this text?
- Always read the first sentence of each paragraph carefully
- Identify the idea that all other sentences support or develop (Correct answer)
- Look for the longest sentence in the passage
- Focus on sentences that contain statistical data
Correct answer: Identify the idea that all other sentences support or develop
The passage states that the main idea is the idea that all other sentences support or develop, regardless of its position in the text.
Question 3: Passage: 'The Coriolis effect influences long-range projectile trajectories and large-scale weather patterns, but its effect on helicopter flight within a local area is negligible. Pilots need not apply Coriolis corrections during normal flight operations.' What does the passage say about the Coriolis effect on helicopter flight?
- It significantly affects rotor blade performance
- It must be corrected for during all flight operations
- Its effect on helicopter flight within a local area is negligible (Correct answer)
- It causes helicopters to drift unpredictably in crosswinds
Correct answer: Its effect on helicopter flight within a local area is negligible
The passage explicitly states that the Coriolis effect's impact on helicopter flight within a local area is negligible.
Question 4: Read: 'An inference is a conclusion drawn from evidence presented in a passage. Unlike stated facts, inferences require the reader to combine information from the text with logical reasoning. However, valid inferences must be supported by the text—they cannot be mere assumptions.' What makes an inference valid according to this passage?
- It agrees with the reader's prior knowledge and experience
- It is drawn from a single clear statement in the passage
- It must be supported by the text, not mere assumption (Correct answer)
- It appears in the conclusion of the passage
Correct answer: It must be supported by the text, not mere assumption
The passage states that valid inferences must be supported by the text and cannot be mere assumptions.
Question 5: Passage: 'Torque is a rotational force. In single-rotor helicopters, the main rotor's rotation creates an opposing torque on the fuselage. The tail rotor counteracts this torque, preventing the fuselage from spinning in the opposite direction of the main rotor.' What is the function of the tail rotor?
- It provides additional lift during takeoff and landing
- It steers the helicopter in forward flight
- It counteracts the torque that would otherwise spin the fuselage (Correct answer)
- It cools the main rotor transmission during extended flights
Correct answer: It counteracts the torque that would otherwise spin the fuselage
The passage states the tail rotor counteracts the main rotor torque that would otherwise cause the fuselage to spin.
Question 6: A passage reads: 'Context clues are words and phrases surrounding an unfamiliar word that help readers determine its meaning. These clues may include synonyms, antonyms, examples, or explanations embedded in the surrounding text.' Which of the following would NOT be a context clue according to this passage?
- A synonym placed near the unfamiliar word
- An antonym that contrasts with the unfamiliar word
- The font size of the unfamiliar word (Correct answer)
- An example that illustrates the word's meaning
Correct answer: The font size of the unfamiliar word
The passage lists synonyms, antonyms, examples, and explanations as context clues; font size is not mentioned and is unrelated to meaning.
Question 7: Passage: 'During a confined area landing, pilots must evaluate the landing zone for obstacles, slope, surface conditions, and wind direction before committing to the approach. A premature commitment to landing without this evaluation can lead to an unsafe or impossible departure.' Why is evaluating the landing zone critical before a confined area landing?
- To allow air traffic control to clear the area of other aircraft
- To ensure the aircraft has sufficient fuel for a second approach
- A premature commitment without evaluation can make departure unsafe or impossible (Correct answer)
- To satisfy military regulations requiring pre-landing documentation
Correct answer: A premature commitment without evaluation can make departure unsafe or impossible
The passage states that committing to a landing without evaluation can lead to an unsafe or impossible departure.
SIFT Reading Comprehension 3
Passage: 'Ground effect occurs when a helicopter operates within approximately one rotor diameter of the ground.
In ground effect, the helicopter requires less power to hover because the rotor downwash is interrupted by the ground surface, increasing lift efficiency.' Why does hovering in ground effect require less power?