Negative Detail Identification

Solid-composite run-flat inserts are reinforced ring assemblies mounted directly around the wheel rim inside tubeless military vehicle tires. When ballistic penetration or severe punctures cause total tire deflation, the tire tread collapses onto the outer circumference of the insert rather than the metal rim. This design prevents rim damage, maintains directional steering control, and allows the vehicle to travel up to 30 miles at reduced speeds. However, the insert adds significant unsprung rotating mass to the axle, which slightly increases fuel consumption during normal highway driving.

Based on the passage, match each statement on the left with its accurate textual status on the right.

Submarine depth and orientation are regulated through two distinct ballast systems. Main ballast tanks (MBTs) are located outside the pressure hull and are either completely flooded with seawater to submerge the vessel or filled with high-pressure air to surface. In contrast, variable ballast tanks (VBTs), consisting of forward and aft trim tanks, are housed inside the pressure hull. Crew members pump water between these internal trim tanks to adjust the vessel's pitch and compensate for shifts in onboard weight distribution. While main ballast operations cause rapid changes in overall buoyancy, variable ballast adjustments are executed gradually using electric trim pumps to maintain neutral buoyancy and horizontal alignment during underwater cruising.

According to the passage, which of the following statements is NOT true regarding the submarine's ballast systems?

Passage:
Radioisotope thermoelectric generators (RTGs) provide electrical power for spacecraft operating in deep space where solar radiation is insufficient. Unlike nuclear fission reactors that rely on a sustained chain reaction, RTGs generate thermal energy solely through the spontaneous radioactive decay of plutonium-238. This heat is converted directly into electricity across solid-state thermocouples using the Seebeck effect. Because RTGs contain no moving mechanical components, they demonstrate remarkable longevity and require no operational lubrication. Nevertheless, the total power output inevitably decreases over time as a result of both fuel decay and the gradual thermal degradation of the thermoelectric junctions.

Statement: According to the passage, radioisotope thermoelectric generators maintain heat production by utilizing a continuous nuclear fission chain reaction.

An aircraft pitot-static system measures fluid air pressures to drive critical flight instruments. The pitot tube faces directly into the relative wind to capture total dynamic pressure, while static ports flush-mounted on the fuselage measure ambient atmospheric pressure. The airspeed indicator relies on both inputs, calculating forward velocity by determining the difference between pitot and static pressures. In contrast, the altimeter and vertical speed indicator connect solely to the static system to gauge barometric height and rate of climb. To prevent internal ice blockage at high altitudes, electrical heating elements are integrated into the pitot probe.

Based on the passage, which of the following statements regarding the aircraft pitot-static system is NOT supported by the text?

Read the following passage regarding marine mechanical systems:

Centrifugal pumps in marine coolant loops rely on a high-speed rotating impeller to accelerate fluid outward into a spiral casing called a volute. If the static pressure at the pump suction inlet falls below the vapor pressure of the liquid, localized boiling occurs, producing microscopic vapor bubbles. When these bubbles travel into higher-pressure zones near the impeller discharge vanes, they collapse violently with micro-jet velocities exceeding 1,000 feet per second. This rapid implosion cycle causes severe acoustic chatter, induces mechanical vibration in the pump bearings, and pits the metallic surface of the impeller blades. Cavitation is mitigated primarily by maintaining an adequate Net Positive Suction Head (NPSH) above the liquid's saturation limit through elevated reservoir head pressure or reduced fluid inlet temperatures.

Based on the passage, match each technical statement on the left with its correct textual verification status on the right.

Read the following passage:

The Tactical Water Purification System (TWPS) processes water from fresh, brackish, or seawater sources to produce potable drinking water for field personnel. The unit utilizes dual microfiltration filters to remove suspended solids and silt before passing water through high-pressure reverse osmosis membranes. Although the system reliably filters out biological bacteria and dissolved mineral salts, it does NOT remove volatile petroleum contaminants without an auxiliary carbon filter attached.

True or False: According to the passage, the standard reverse osmosis system alone is NOT capable of removing volatile petroleum contaminants.

When performing cold-weather starts on the T-800 turbofan engine, the flight crew must adhere to a rigid initialization sequence. First, the crew must isolate the pneumatic manifold by verifying that the cross-bleed valve is closed. Next, the auxiliary power unit (APU) is engaged to provide electrical bus stabilization before introducing any aviation fuel. Once the APU reaches 95% of its maximum RPM, the igniter plugs must be energized continuously. The crew is required to monitor the exhaust gas temperature (EGT) meticulously; if the EGT exceeds 720°C during the first ten seconds of combustion, an immediate fuel cutoff is mandated. Notably, unlike standard warm-weather procedures, the pre-start lubricating oil pressure check is bypassed to prevent sensor cavitation in sub-zero conditions.

Is it true or false that, based on the provided text, the flight crew is NOT instructed to open the cross-bleed valve, perform a pre-start lubricating oil pressure check, or isolate the pneumatic manifold?

A Flameless Ration Heater (FRH) is a water-activated chemical heater included in military operational rations. It uses a mixture of powdered magnesium, iron, and sodium chloride inside a durable plastic bag. When approximately two tablespoons of plain water are added to the bag, an exothermic oxidation-reduction reaction occurs rapidly between the water and magnesium. This chemical reaction generates enough heat to raise the temperature of an eight-ounce prepackaged meal by 100 degrees Fahrenheit in twelve minutes. The reaction produces non-toxic hydrogen gas as a byproduct, so heating must always be conducted in well-ventilated areas.

According to the passage, all of the following statements about the Flameless Ration Heater are true EXCEPT:

Modern Electronic Countermeasures (ECM) rely heavily on differentiating between noise jamming and deceptive jamming tactics. Noise jamming attempts to mask a target by flooding the victim radar's receiver with continuous high-power radio frequency (RF) energy, thereby degrading the signal-to-noise ratio. In contrast, deceptive jamming involves receiving the victim radar's signal, altering its timing or Doppler frequency, and transmitting the modified pulse back to create phantom targets or false velocity readings. While noise jamming requires substantial power output and typically reveals the jammer's line of bearing to the enemy, deceptive jamming utilizes comparatively lower power and is specifically tailored to exploit vulnerabilities in pulse-Doppler tracking algorithms. Environmental factors, such as severe precipitation or atmospheric ducting, can further attenuate high-frequency ECM signals, necessitating adaptive power management systems.

According to the passage, all of the following statements regarding Electronic Countermeasures are true EXCEPT:

Read the following passage regarding emergency signaling equipment:

A military signal mirror is a compact survival tool designed to reflect sunlight toward rescue aircraft or search teams. Constructed from durable glass or polished stainless steel, the mirror features a specialized retroreflective aiming hole in its center. When looking through this center aperture, an operator sees a bright red target dot indicating precisely where the reflected flash is aimed. Flashes from the mirror can be seen from up to twenty miles away on clear days. Unlike electronic locator beacons, the mirror requires no battery power and operates indefinitely under daylight conditions.

Match each statement regarding the signal mirror with its correct factual status based on the passage.

The standard military lensatic compass consists of three major parts: the cover, the base, and the lens. The cover protects the compass dial and contains the sighting wire. The base houses the floating dial, which rotates freely and features luminous markings for low-light navigation. Connected to the base is the lens bracket, used to magnify dial readings while sighting an azimuth. Additionally, the compass features a thumb loop attached to the base, which serves as both a carrying handle and a stabilizing lock when folded over the cover.

According to the passage, which of the following is NOT a feature or component of the lensatic compass?

The standard shipboard Self-Contained Breathing Apparatus (SCBA) provides respiratory protection in toxic environments. The system utilizes a high-pressure composite cylinder charged with breathable compressed air to 4,500 psi. A first-stage regulator reduces cylinder pressure to approximately 100 psi before air reaches the facepiece regulator. Additionally, an integrated Personal Alert Safety System (PASS) device triggers an audible alarm if the wearer remains motionless for 30 seconds.

Based on the passage, the shipboard SCBA cylinder is charged with pure compressed oxygen.

The P-100 is a commercial diesel engine-driven portable pump designed for shipboard firefighting and dewatering operations. It provides a nominal discharge rating of 100 gallons per minute at 83 psi when operating with a suction lift of 20 feet. The unit features an air-cooled, single-cylinder four-stroke diesel engine that runs exclusively on standard military diesel fuel (DFM) or JP-5 jet fuel. To prevent engine overheating during extended operations, the cooling system utilizes ambient air drawn through an intake shroud by an engine-mounted flywheel fan. Operators must prime the pump casing manually using an exhaust-gas-driven ejector assembly before commencing liquid discharge.

According to the passage, which of the following is NOT true regarding the P-100 portable pump?

Read the following passage regarding naval flight deck equipment:

Aircraft carrier arresting gear systems, such as the Mark 7 Mod 3, decelerate high-speed landing aircraft within a short distance on the flight deck. The system utilizes four forged steel cross-deck pendant cables suspended above the deck by retractable wire supports. When a landing aircraft's tailhook snags a pendant cable, the kinetic energy is transferred to an engine cylinder located below deck, where hydraulic fluid is displaced through an accumulator valve to absorb the shock. Operators must inspect each pendant cable after every hundred arrested landings or whenever excessive fraying is detected. The arresting engine retracts the cable back to its ready position within thirty seconds using pneumatic pressure. The system is designed to operate exclusively with mechanical and hydraulic energy, requiring no auxiliary electrical power during the mechanical arrestment cycle.

Based on the passage, match each statement on the left with its factual verification status on the right.

The OE-254 is a tactical biconical antenna group used by military ground units to extend the communication range of tactical VHF-FM radios. Designed for rapid deployment, the entire system can be assembled and erected by two soldiers in under fifteen minutes. The antenna uses lightweight aluminum mast sections to elevate the feed cone approximately 30 feet above the ground, significantly improving line-of-sight signal transmission. During transport, all mast components, guy ropes, and coaxial cables are stowed inside a durable canvas carrying bag to protect them from dirt and moisture.

According to the passage, which of the following is NOT true regarding the OE-254 antenna system?

Read the passage and evaluate the statement below.

An aircraft pitot-static system measures air pressure to operate three primary flight instruments: the airspeed indicator, the altimeter, and the vertical speed indicator. Forward motion forces ambient air into the pitot tube, generating ram air pressure. To prevent icing at high altitudes, the pitot tube contains an internal electric heating element. Flush-mounted static ports located on the aircraft fuselage measure undisturbed atmospheric pressure. The airspeed indicator requires differential input from both the pitot tube and the static ports to determine velocity. In contrast, the altimeter and vertical speed indicator connect exclusively to the static ports and do not utilize ram air pressure. Pre-flight inspections require personnel to verify that moisture drain openings in the lines remain unobstructed.

Based on the passage, the vertical speed indicator relies on both ram air from the pitot tube and atmospheric pressure from the static ports.

On-Board Inert Gas Generating Systems (OBIGGS) protect military aircraft fuel tanks from explosion by replacing oxygen in the fuel tank ullage with inert nitrogen. Ambient air from the engine bleed system is first routed through an air separation module containing semi-permeable hollow fiber membranes. These membranes separate oxygen and water vapor from nitrogen molecules. The resulting nitrogen-enriched air is continuously discharged into the fuel tanks, maintaining oxygen concentration below nine percent. Because OBIGGS generates nitrogen continuously during flight, it eliminates the requirement for heavy liquid nitrogen storage dewars on board.

According to the passage, all of the following are true of the On-Board Inert Gas Generating System EXCEPT:

Pneumatic de-icing boots are inflatable rubber membranes attached to the leading edges of aircraft wings and tail surfaces to remove accumulated structural ice. During flight in icing conditions, engine bleed air or an auxiliary pneumatic pump inflates these rubber bladders in rapid cycles. As the rubber expands outward, it cracks and breaks the bond of the brittle ice layer, allowing high-speed oncoming airflow to strip the ice away. The system then applies vacuum suction to deflate the boots completely flat against the wing to minimize aerodynamic drag. Flight crews must activate the system only after a measurable layer of ice forms, as inflating them prematurely can cause ice to bridge over the inflated boot without breaking off.

Based on the passage, which of the following statements about pneumatic de-icing boots is NOT accurate?

Hydraulic accumulators in military aircraft store pressurized fluid to dampen pressure surges and provide emergency power if primary engine-driven pumps fail. Most tactical aircraft use nitrogen-charged piston accumulators, where a floating piston physically separates hydraulic fluid from a pre-charged chamber of dry nitrogen gas. Because nitrogen is chemically inert and non-flammable, it eliminates the risk of diesel effect combustion under high-pressure compression. While hydraulic fluid volume varies with system demand, the mass of sealed nitrogen gas remains constant during normal operations. Routine maintenance inspections verify the accumulator's static pre-charge pressure using an external pressure gauge only when the hydraulic system is fully depressurized.

According to the passage, routine maintenance inspections verify the accumulator's static pre-charge pressure while the aircraft hydraulic system operates under full pressure.

Sound-powered telephone systems provide critical emergency communication aboard naval vessels without relying on external electrical power. When a user speaks into the transmitter, acoustic sound waves vibrate a flexible diaphragm linked directly to a magnetic armature, generating weak electrical currents through electromagnetic induction. These self-generated electrical signals travel along dedicated, shielded two-wire circuits to the receivers of connected handsets. Because the system produces its own operating energy directly from voice vibrations, communication remains active even during complete shipboard electrical blackout. However, operational range is strictly limited compared to amplified networks, and having multiple talkers on the same circuit simultaneously diminishes audio clarity due to signal division.

According to the passage, which of the following is NOT true regarding sound-powered telephone systems?