Negative Detail Identification

Passage:
Nuclear submarines rely on regenerative carbon dioxide ($CO_2$) scrubbers to maintain breathable atmospheric conditions during prolonged submerged operations. Ambient air is drawn continuously through beds of solid amine resin, which chemically bind $CO_2$ molecules at room temperature. Once a resin bed becomes saturated, the system automatically redirects incoming airflow to an alternate bed and exposes the saturated resin to steam heat and a vacuum, venting the desorbed $CO_2$ gas directly into the surrounding seawater. This cyclical thermal desorption allows the amine resin to be reused indefinitely without consuming consumable chemical cartridges. In contrast, older non-regenerative systems required manual replacement of disposable lithium hydroxide ($LiOH$) canisters, which generated hazardous solid waste and occupied valuable storage space.

Statement: According to the passage, modern regenerative carbon dioxide scrubbers require consumable chemical cartridges that must be manually replaced when saturated.

Read the following passage about naval degaussing systems:

Naval degaussing systems counteract a ship's magnetic signature to prevent the detonation of magnetic influence sea mines. As a steel-hulled vessel moves through the Earth's magnetic field, its hull acquires permanent and induced magnetization. Degaussing installations consist of heavy electrical cables wrapped around interior compartments through which controlled direct current (DC) is passed. This current produces an opposing magnetic field that neutralizes the ship's overall magnetic field. Shipboard sensors continuously monitor local magnetic field variations and ship heading to automatically adjust coil currents. However, degaussing does not eliminate acoustic or thermal signatures, and it requires dedicated electrical power from shipboard generators rather than relying on natural hull dissipation.

Which factual assessment from the passage corresponds to each statement regarding the naval degaussing system?

Reverse Osmosis Water Purification Units (ROWPU) provide potable water in field operations by filtering fresh, brackish, or saline water sources. Incoming raw water first undergoes chemical pretreatment with coagulants and passes through multimedia sand filters to eliminate suspended solids and turbidity. Next, cartridge filters capture finer particulate matter before high-pressure pumps force the water through semipermeable polyamide membranes that block dissolved salts, heavy metals, and biological pathogens. Treated water is subsequently chlorinated to maintain residual disinfection during storage. However, ROWPUs cannot treat water contaminated with petroleum products, as hydrocarbons rapidly degrade the reverse osmosis membranes.

According to the passage, which of the following statements about the ROWPU is NOT true?

Steel ship hulls in saltwater environments are highly vulnerable to galvanic corrosion caused by electrochemical reactions between dissimilar metals. To protect the primary steel structure, sacrificial anodes made of zinc or aluminum alloys are mounted directly to the hull below the waterline. Because zinc has a lower electrochemical potential than steel, the zinc anode oxidizes preferentially, corroding away while the steel hull remains protected as the cathode. Sacrificial anodes require zero external electrical power to function and are routinely inspected during drydock servicing. Technicians schedule replacement when an anode is depleted by approximately 50 percent of its original mass.

According to the passage, all of the following statements regarding sacrificial zinc anodes are true EXCEPT:

Read the following technical passage about aircraft emergency systems:

A Ram Air Turbine (RAT) is an emergency power source installed on modern military and commercial aircraft. In the event of total engine failure or primary electrical and hydraulic loss, the RAT automatically deploys into the airstream from a compartment in the fuselage or wing. As oncoming airflow spins its multi-blade propeller, the turbine directly drives a dedicated hydraulic pump, an electrical generator, or both. The RAT is governed to operate only when the aircraft maintains a minimum airspeed to ensure sufficient rotational speed. Because it derives its kinetic energy strictly from forward motion, it cannot generate power while the aircraft is stationary on the ground. Once deployed in flight, standard RAT systems cannot be retracted from the cockpit and must be manually reset by ground maintenance personnel after landing.

Match each statement regarding Ram Air Turbine (RAT) operation with its factual status according to the passage.

Modern high-bypass turbofan engines utilize cascade-type thrust reversers to decelerate aircraft upon landing. When deployed, mechanical actuator rings slide the translating cowls aft, exposing stationary cascade vanes while simultaneously positioning blocker doors across the bypass air duct. These blocker doors redirect cold fan bypass airflow forward and outward through the angled cascades to generate reverse thrust. Because the core engine flow remains uninterrupted and continues traveling straight aft, the reverser operates safely without stalling the internal compressor stages. Thrust reversers automatically stow before ground taxi speed drops below sixty knots to prevent airborne ingestion of foreign debris.

According to the passage, all of the following are true regarding cascade thrust reversers EXCEPT:

Read the following technical passage:

"An aircraft's pitot-static system utilizes air pressure differentials to operate three essential flight instruments: the airspeed indicator, the altimeter, and the vertical speed indicator. Ram air pressure entering the forward-facing pitot tube drives the airspeed indicator alone. Ambient atmospheric pressure enters through flush-mounted static ports on the fuselage and is routed to all three instruments. When pitot tube drain holes become clogged in icing conditions, electrical heating elements prevent ice accumulation. If the static port freezes shut, the altimeter freezes at its current altitude and the vertical speed indicator drops to zero, but the system does not utilize engine bleed air to clear the blockage."

Based on the passage, match each operational statement with its corresponding factual status according to the text.

Modern military night-vision goggles rely on image intensifier tubes to amplify ambient light in dark environments. Incoming photons enter through an objective lens and strike a photocathode, which converts light energy into a stream of free electrons. These electrons are accelerated by an electrical field into a microchannel plate (MCP), a thin glass disc containing millions of microscopic channels that multiply the electrons through secondary emission. The amplified electron cascade then impacts a phosphor screen, converting kinetic electrical energy back into visible green photons viewed through the ocular eyepiece. While the intensifier tube magnifies ambient moonlight and starlight thousands of times, it requires an external high-voltage power supply and cannot function in absolute darkness without active infrared illumination.

According to the passage, which of the following statements about image intensifier tubes is NOT accurate?