Tüm alıştırma soruları

Read the passage below:

During fiber-optic cable installation, technicians rely on automated fusion splicing rather than mechanical splices for permanent trunk lines. While mechanical connectors merely align fiber cores inside a gel-filled sleeve, fusion splicers align the glass strands microscopically and emit an electric arc to melt and weld the tips together. Although fusion equipment requires significant upfront investment and meticulous cleaving of the glass ends, it reduces optical signal loss to less than 0.02 decibels per splice and permanently eliminates air gaps. By ensuring structural continuity, fusion splicing prevents reflective signal degradation that would otherwise cripple long-distance data transmission.

Match each excerpted statement from the passage with the author's primary communicative intent for including it.

A tactical backpack originally costs $\$80$. If it is on sale for a $25\%$ discount, what is the final sale price of the backpack?

Commercial deep-sea divers replace atmospheric nitrogen with helium in their breathing mixtures to eliminate the risk of nitrogen narcosis at extreme depths. However, helium conducts thermal energy away from the human body approximately six times faster than nitrogen. In cold underwater environments, a diver inhaling cold helium-oxygen gas loses core body heat rapidly through respiration alone, even when wearing an insulated drysuit that prevents external water contact.

Based on the passage, which of the following is the most logical conclusion?

What are all the possible values of $y$ that satisfy the inequality shown above?

What is the value of $x$ in the equation below?

Expendable bathythermograph (XBT) probes are deployed from survey vessels to record water temperature profiles at varying ocean depths. As the probe descends through the water column at a known terminal velocity, a fine copper wire unspools from both the probe and the onboard launcher to transmit continuous resistance readings. Inside the streamlined zinc nose cone, a precision thermistor detects minute temperature fluctuations. The recording system converts the measured electrical resistance directly into temperature values, pairing each reading with an elapsed-time calculation to determine exact depth without requiring an active acoustic transmitter.

According to the passage, which component detects temperature fluctuations inside the probe?

During pre-flight inspections of the CRU-60/A oxygen regulator and auxiliary emergency supply on tactical aircraft, life support technicians must verify specific pressure thresholds. The main liquid oxygen converter delivers gaseous oxygen to the pilot at a regulated pressure of 70 psi during standard cruising altitudes. However, the seat-mounted emergency bailout cylinder is charged to a much higher pressure of 1,800 psi. If cabin depressurization occurs above 30,000 feet, the emergency system automatically deploys, providing approximately 10 minutes of breathable oxygen while the pilot descends to a safe altitude of 10,000 feet.

According to the passage, what is the charged pressure of the seat-mounted emergency bailout cylinder?

Evaluate the following mathematical statement:

Which of the following represents the correct solution for $x$?

When servicing tactical communication towers in coastal regions, maintenance crews must treat metal junction boxes to prevent deleterious—that is, harmful or destructive—corrosion caused by airborne saltwater. Unchecked oxidation can degrade delicate electronic circuits and disrupt signal transmission between field units. Protective polymer coatings are routinely sprayed over all exposed terminals to ensure reliable long-term performance.

Based on the context of the passage, what does the word "deleterious" most nearly mean?

Modern tactical aircraft utilize Onboard Inert Gas Generating Systems (OBIGGS) to minimize explosive hazards within fuel tanks. Compressed bleed air from the engine passes through an ozone converter before entering the Air Separation Module (ASM). Inside the ASM, hollow-fiber polymeric membranes selectively filter gases; oxygen and water vapor permeate rapidly through the fiber walls and vent overboard. The remaining nitrogen-enriched air, which retains a purity level of at least 95 percent, is routed directly into the fuel tank ullage space to displace combustible vapor.

Statement: According to the passage, the hollow-fiber membranes in the Air Separation Module allow oxygen to vent overboard while directing nitrogen-enriched air into the fuel tank.

The BAK-12 aircraft arresting system is installed along military runways to safely decelerate tactical aircraft during emergency landings. The system utilizes two synchronized energy absorbers positioned on opposite sides of the runway, connected by a steel purchase tape to a pendant cable. When an aircraft's tailhook engages the pendant, the purchase tape unspools against a modulated hydraulic braking force. To prevent tape binding, technicians must inspect the hydraulic brake pressure relief valves every 30 days and replace the sacrificial bronze friction pucks whenever wear exceeds a thickness threshold of 0.125 inches.

According to the passage, what specific maintenance action must be performed every 30 days?

Read the following passage:

Sacrificial zinc anodes are mounted on the submerged steel hulls and bronze propellers of ocean-going vessels to prevent galvanic corrosion in seawater. Because zinc possesses a more negative electrochemical potential than steel or bronze, electrical current in the conductive saltwater flows preferentially from the zinc, causing it to oxidize and corrode while leaving the ship's primary structural metals intact. However, this protective reaction requires continuous electrical and physical contact between the zinc and the surrounding electrolyte. If an anode is thoroughly covered by marine biofouling organisms, electrical flow is blocked.

Based on this passage, it can be logically concluded that a vessel whose zinc anodes become heavily encrusted with marine growth will lose galvanic corrosion protection even if substantial unoxidized zinc remains.

In semiconductor fabrication facilities, laminar flow hoods maintain contamination-free work zones by forcing filtered air downward across benches at a calibrated velocity. If the airflow velocity drops below the required minimum, ambient room drafts overcome the stream and introduce airborne particles into the critical area. Conversely, if the velocity exceeds the specified maximum, the high-speed air generates turbulent eddies at the perimeter of the bench that draw surrounding unfiltered air back onto the work surface.

Based on this passage, which of the following is a logical conclusion regarding laminar airflow management?

A recruit training battalion consists of $500$ recruits. If $15\%$ of the recruits are scheduled for a dental examination today, how many recruits are scheduled for the examination?

Compute the final value of the following fraction by correctly applying the order of operations:

Which of the following is the correct result?

Read the passage below:

Nondestructive testing technicians frequently rely on eddy current inspection to detect microscopic fatigue cracks in conductive aircraft skins without stripping protective paint. By inducing localized alternating electromagnetic fields into the aluminum alloy, the probe detects subtle disruptions in electrical conductivity caused by subsurface flaws. While ultrasonic and radiographic methods can penetrate thicker structural spars, eddy current testing provides rapid, highly sensitive surface-level scanning on assembled airframes. Consequently, maintenance depots prioritize this method during routine turnarounds to identify invisible micro-fractures before catastrophic structural failure occurs.

Statement: Based on the passage, the author's primary purpose is to explain the function and practical advantages of eddy current inspection in aircraft maintenance.

Simplify the following algebraic expression:

Which expression represents the fully simplified result?

A maintenance squad has $250$ spark plugs in their inventory. After a week of vehicle repairs, the inventory is reduced by $40\%$. How many spark plugs are left in the inventory?

When securing critical mechanical fasteners, technicians often assume that applying higher torque directly produces a stronger joint. In reality, up to ninety percent of applied torque is consumed overcoming friction in the threads and beneath the bolt head, leaving only ten percent to generate clamping tension. Applying thread lubricants drastically alters this balance by reducing friction coefficient, which allows identical torque values to stretch bolts past their yield point and cause mechanical failure. Proper torquing protocols require mechanics to adjust torque specifications according to the specific lubricant used rather than relying on dry torque tables.

What is the author's primary purpose in writing this passage?