Defence Services Technological Academy Entrance Examination (တပ်မတော်နည်းပညာတက္ကသိုလ် — DSTA)

Read the following passage: 'Concrete performs well under compression but is much weaker under tension. In a reinforced beam, embedded steel carries tensile forces that develop as the beam bends, allowing the two materials to act together.' According to the passage, why is steel reinforcement added to concrete?

• ATo carry tensile forces where the concrete is comparatively weak
• BTo accelerate every stage of the concrete-curing reaction
• CTo reduce the total mass of the beam
• DTo prevent the concrete from carrying any compressive force

In the engineering report sentence 'The turbine's rotor blades underwent rigorous non-destructive testing to detect any latent microfractures prior to high-speed commissioning', what is the meaning of the word 'latent'?

• AExisting but dormant, hidden, or not yet visible
• BSevere and immediately hazardous to nearby personnel
• CSuperficial and easily polished away with abrasive paste
• DArtificially induced by high-temperature heat treatment

Read the statement: 'Aerodynamic drag on an unstreamlined military utility vehicle increases with the square of its forward velocity. Consequently, doubling the vehicle's speed quadruples aerodynamic drag, demanding an eightfold increase in engine power output to overcome air resistance.' What conclusion directly follows regarding high-speed vehicular travel?

• AFuel consumption and power requirements increase disproportionately at higher speeds due…
• BVehicle velocity has no meaningful influence on mechanical power demands in highway drivi…
• CAerodynamic drag remains constant at all speeds as long as engine RPM is kept below redli…
• DDoubling speed doubles the fuel efficiency because transit time is reduced by half.

Which of the following sentences correctly transforms the active voice into the passive voice? 'The telemetry station calibrated the guidance gyroscopes before launching the missile.'

• AThe guidance gyroscopes were calibrated by the telemetry station before launching the mis…
• BThe guidance gyroscopes had calibrated by the telemetry station before launching the miss…
• CThe guidance gyroscopes are calibrated by the telemetry station before launching the miss…
• DBefore launching the missile, the telemetry station was calibrating the guidance gyroscop…

What is the meaning of the technical term 'ductility' in materials science?

• AThe ability of a material to deform plastically and stretch under tensile stress without…
• BThe resistance of a material's surface to scratching or indentation
• CThe tendency of a material to fracture abruptly with negligible plastic deformation
• DThe measure of electrical resistance across a standardized conductor unit

Choose the sentence that correctly transforms the direct instruction into indirect speech: Direct: The chief engineer said, 'Do not disengage the hydraulic cooling circuit while the motor is running.'

• AThe chief engineer warned the technicians not to disengage the hydraulic cooling circuit…
• BThe chief engineer said that do not disengage the hydraulic cooling circuit while the mot…
• CThe chief engineer told that the technicians must disengage the hydraulic cooling circuit…
• DThe chief engineer asked whether the technicians did not disengage the hydraulic cooling…

Read the passage: 'Closed-loop feedback systems in robotics measure system output via sensors and feed that signal back to compare with the desired reference input. The error signal generated by this comparison drives an actuator to continuously correct the system's state toward equilibrium.' What is the fundamental function of the error signal in feedback control?

• AIt represents the discrepancy between desired and actual output and drives corrective act…
• BIt shuts down electrical power to prevent motor burnout whenever a discrepancy is detecte…
• CIt amplifies mechanical vibrations to test the structural resonance frequency of the chas…
• DIt permanently resets the initial reference input to match whatever output the system ach…

Which of the following sentences correctly uses an inversion structure following a negative adverbial in technical writing?

• AUnder no circumstances should pressurized steam valves be opened without protective shiel…
• BUnder no circumstances pressurized steam valves should be opened without protective shiel…
• CUnder no circumstances should be opened pressurized steam valves without protective shiel…
• DUnder no circumstances do pressurized steam valves should be opened without protective sh…

What is the synonym of the word 'redundancy' in engineering design?

• ADuplication of critical components to increase system reliability and fault tolerance
• BUnnecessary expenditure that serves no technical function
• CTotal structural failure of a mechanical load-bearing pillar
• DThe complete conversion of kinetic energy into waste heat

Select the correct conditional sentence for an engineering troubleshooting scenario: 'If the auxiliary generator _______ during the blackout, the perimeter radar _______ operational.'

• Ahad started; would have remained
• Bstarted; will remain
• Chas started; would remain
• Dhad started; will have remained

What does the engineering term 'tolerance' refer to in precision manufacturing?

• AThe permissible limit or limits of variation in a physical dimension or property
• BThe ability of an alloy to endure corrosive chemical exposure indefinitely
• CThe maximum speed at which a cutting lathe can operate without vibration
• DThe acoustic sound dampening rating of an engine compartment

Which of the following sentences correctly applies a relative pronoun to describe technical equipment?

• AThe oscilloscope, which was calibrated last week, detected the anomalous voltage transien…
• BThe oscilloscope, who was calibrated last week, detected the anomalous voltage transient.
• CThe oscilloscope, whom was calibrated last week, detected the anomalous voltage transient.
• DThe oscilloscope that was calibrated last week, detected the anomalous voltage transient.

Read the statement: 'Laser rangefinders compute target distance by transmitting a focused optical pulse and measuring the precise round-trip elapsed time before the reflected photon packet returns to the receiver diode.' What fundamental physical principle enables distance determination in laser telemetry?

• ADistance is calculated using the constant speed of light and time-of-flight elapsed measu…
• BDistance is determined by measuring the shift in gravitational field strength across the…
• CThe laser pulse heats the target until its thermal radiation reveals distance via color s…
• DThe laser physically attaches a molecular fiber optic tether to the target surface.

Identify the sentence that contains an error in the use of the mandative subjunctive:

• AThe specification mandates that every structural bolt is tightened to the specified torqu…
• BThe specification mandates that every structural bolt be tightened to the specified torqu…
• CThe safety protocol requires that all personnel wear protective eye gear in the machine s…
• DThe test director suggested that the antenna array undergo recalibration before deploymen…

What is the meaning of the technical word 'attenuation' in telecommunications and signal processing?

• AThe reduction in amplitude or power of a signal as it propagates through a transmission m…
• BThe intentional amplification of high-frequency background static noise
• CThe conversion of analog audio into discrete binary numerical values
• DThe physical destruction of an antenna tower by high-velocity wind gusts

Choose the most appropriate preposition to complete the sentence: 'The structural engineer certified that the bridge complied _______ all national seismic design standards.'

• Awith
• Bto
• Cfor
• Dat

What does the idiom 'back to the drawing board' mean in an engineering development context?

• ATo start an engineering project over again from the beginning because a previous plan fai…
• BTo trace technical blueprints onto translucent vellum paper manually
• CTo reprimand an engineering technician for drafting errors
• DTo submit completed mechanical drawings to a patent office

Which sentence demonstrates the correct use of parallel structure in an engineering design brief?

• AThe autonomous rover must navigate rugged terrain, avoid stationary obstacles, and transm…
• BThe autonomous rover must navigate rugged terrain, avoiding stationary obstacles, and tra…
• CThe autonomous rover must navigation of rugged terrain, avoid stationary obstacles, and t…
• DThe autonomous rover must navigate rugged terrain, avoid stationary obstacles, and transm…

What is the meaning of the technical adjective 'impervious' in materials engineering?

• ANot allowing fluids, gases, or radiation to pass through
• BExtremely susceptible to rapid chemical corrosion
• CCapable of conducting electrical current with zero resistance
• DHighly brittle when subjected to sudden mechanical impacts

In a formal engineering letter addressed to a supplier whose name is unknown, what is the standard formal salutation and corresponding complimentary close?

• ADear Sir or Madam, ... Yours faithfully,
• BDear Sir or Madam, ... Yours sincerely,
• CDear Friend, ... Best wishes,
• DTo Whom It May Concern, ... Cheers,

Which of the following sentences correctly expresses a causal relationship without ambiguity?

• ADue to catastrophic hydraulic fluid depletion, the landing gear failed to deploy into the…
• BThe landing gear failed to deploy into the locked position being that catastrophic hydrau…
• CBecause of the landing gear failed, catastrophic hydraulic fluid depletion was taking pla…
• DAs hydraulic fluid depleted catastrophically, but the landing gear failed to lock.

Complete the professional engineering dialogue: Lead Engineer: 'We have observed excessive thermal expansion on the main transmission shaft during static trials.' Materials Specialist: '_______'

• A'I recommend reviewing the temperature data and evaluating a material with a lower coeffi…
• B'I recommend recording the observation but making no change until the shaft fails.'
• C'I recommend changing the exterior colour because colour determines the shaft's expansion…
• D'I recommend increasing the operating speed before we assess the cause of the expansion.'

What is the meaning of the technical prefix 'iso-' in terms such as 'isotropic', 'isothermal', and 'isobaric'?

• AEqual, identical, or constant
• BRapidly changing or volatile
• CSubsurface or subterranean
• DInversely proportional to mass

Which sentence correctly demonstrates the use of a semicolon between closely related independent clauses?

• AThe primary radar antenna tracks azimuth angle; the secondary radar interrogates altitude…
• BThe primary radar antenna tracks azimuth angle; and the secondary radar interrogates alti…
• CThe primary radar antenna tracks azimuth angle; tracking altitude with the secondary rada…
• DThe primary radar antenna tracks azimuth angle, the secondary radar interrogates altitude…

What is the purpose of the 'Executive Summary' section in a formal engineering feasibility report?

• ATo provide a concise overview of the project's purpose, key technical findings, conclusio…
• BTo list the names and personal biographies of all junior lab technicians involved in data…
• CTo present raw unformatted sensor data tables spanning hundreds of pages
• DTo disclaim all legal responsibility for mechanical failures in customer products

Which of the following sentences correctly expresses an active directive in the passive voice with a modal auxiliary? Active: 'The maintenance technicians must inspect the emergency bypass valve every six months.'

• AThe emergency bypass valve must be inspected by the maintenance technicians every six mon…
• BThe emergency bypass valve must have inspected by the maintenance technicians every six m…
• CThe emergency bypass valve is must inspected by the maintenance technicians every six mon…
• DEvery six months, the maintenance technicians must be inspecting the emergency bypass val…

In fluid mechanics and hydraulic machinery, what does the term 'cavitation' describe?

• AThe rapid formation and violent implosion of microscopic vapor bubbles in a liquid flowin…
• BThe gradual build-up of calcium carbonate scale along the interior walls of heated boiler…
• CThe laminar smoothing of turbulent fluid currents by chemical surfactant additives
• DThe complete solidification of hydraulic oil under extreme sub-zero arctic temperatures

Choose the most appropriate conjunction to contrast the mechanical properties of two materials: 'Structural steel possesses high ductility and tensile strength, _______ cast iron is brittle and fractures under sudden tensile shock.'

• Awhereas
• Bmoreover
• Cconsequently
• Dbecause

What is the engineering definition of a fluid's 'viscosity'?

• AA measure of a fluid's internal resistance to gradual deformation by shear or tensile str…
• BThe ratio of a fluid's mass density to that of pure water at four degrees Celsius
• CThe total electrostatic charge carried by suspended colloidal particles in a solvent
• DThe velocity at which acoustic shockwaves propagate through a gaseous medium

Convert the technician's logbook entry into indirect speech: Direct: The duty engineer logged, 'I have shut down the auxiliary compressor because the bearing temperature exceeded the safe operating limit.'

• AThe duty engineer logged that he had shut down the auxiliary compressor because the beari…
• BThe duty engineer logged that he has shut down the auxiliary compressor because the beari…
• CThe duty engineer logged that I had shut down the auxiliary compressor because the bearin…
• DThe duty engineer logged that he would shut down the auxiliary compressor because the bea…

What is the structural engineering meaning of the term 'resonance'?

• AThe dramatic amplification of oscillatory amplitude that occurs when the frequency of an…
• BThe chemical reaction between atmospheric moisture and galvanized iron coatings
• CThe permanent compression of foundation soil under sustained deadweight loading
• DThe thermal dissipation of electrical currents through grounded metal conductors

Select the correct prepositions to complete the sentence: 'Untreated carbon steel is highly susceptible _______ galvanic corrosion when placed in direct electrical contact _______ copper fittings in seawater.'

• Ato; with
• Bfor; to
• Cat; by
• Dwith; against

What is the meaning of the idiom 'cutting edge' in modern technological development?

• AThe most advanced, innovative, or pioneering stage of a scientific or technological field
• BA sharpened diamond blade used in high-precision semiconductor wafer sawing
• CAn unsafe manufacturing shortcut that bypasses required quality controls
• DThe hazardous perimeter fence surrounding a munitions testing facility

Which sentence correctly uses a colon to introduce a list of technical requirements?

• AThe procurement order specified three essential components: high-torque servo motors, shi…
• BThe procurement order specified: three essential components, high-torque servo motors, sh…
• CThe three essential components specified were: high-torque servo motors, shielded ribbon…
• DThe procurement order: specified three essential components, high-torque servo motors, sh…

What is the physical meaning of a material's 'thermal conductivity'?

• AThe intrinsic rate at which heat energy is conducted through a unit thickness of the mate…
• BThe maximum temperature a substance can reach before initiating spontaneous combustion
• CThe electric charge generated on the surface of a crystal under mechanical pressure
• DThe rate of evaporative moisture loss across a porous membrane

Identify the sentence that corrects the dangling modifier in this engineering procedure: 'After examining the cracked fuselage, the aircraft was grounded by the flight safety officer.'

• AAfter examining the cracked fuselage, the flight safety officer grounded the aircraft.
• BAfter examining the cracked fuselage, the grounding of the aircraft occurred.
• CExamining the cracked fuselage, the aircraft was grounded.
• DThe aircraft was grounded, after having examined the cracked fuselage by the flight safet…

What is 'galvanic corrosion' in marine engineering?

• AAccelerated electrochemical degradation of a more reactive metal when coupled to a less r…
• BCorrosion caused exclusively by high-temperature exhaust gas oxidation
• CMechanical pitting resulting from high-velocity sand erosion in arid deserts
• DThe chemical dissolution of glass fibers by concentrated hydrofluoric acid

Which sentence correctly combines the two statements into a single complex sentence using a relative clause? 'The radar array was installed on the observation tower last month. It provides 360-degree airspace coverage.'

• AThe radar array, which was installed on the observation tower last month, provides 360-de…
• BThe radar array was installed on the observation tower last month, it provides 360-degree…
• CInstalled on the observation tower last month, but the radar array provides 360-degree ai…
• DThe radar array provides 360-degree airspace coverage, which it was installed on the obse…

What is the engineering definition of a metal's 'yield strength'?

• AThe stress level at which a material transitions from reversible elastic deformation to p…
• BThe absolute maximum stress a material can withstand before catastrophic fracture occurs
• CThe total amount of thermal energy absorbed before melting into a liquid
• DThe electrical conductivity measured at cryogenic temperatures

Complete the professional radio dialogue: Field Engineer: 'The primary telemetry link has failed, but the backup link remains available.' Control Station: '_______'

• A'Understood. Confirm that the backup link is stable and report the system status.'
• B'Understood. Continue without checking the backup link and omit the failure from the log.'
• C'The message is unclear. Change the subject before reporting any system status.'
• D'The primary link failed, so the available backup link must also be ignored.'

In a formal business letter requesting warranty replacement of a defective servomotor, which opening sentence maintains the most appropriate professional register?

• AI am writing to formally request a replacement for the Model-TX5 servomotor under the ter…
• BWe are pretty mad that your cheap motor broke down during our field trials yesterday.
• CHey there, can you send us a new motor because the one you delivered was completely usele…
• DI am writing this letter because our motor stopped working and we don't know what else to…

What is the recommended format for a subject line in an official technical incident report?

• AINCIDENT REPORT: Auxiliary Power Unit Failure — Unit 3 — 18 September
• BReport about the equipment problem mentioned earlier
• CUrgent technical matter requiring attention
• DUnit 3 update and several other notes

Complete the technical dialogue: Quality Inspector: 'Visual inspection reveals micro-voids and cold solder joints across the power regulation bus.' Lead Electronics Technician: '_______'

• A'We will reject this batch, quarantine the affected circuit boards, and recalibrate the r…
• B'We will accept the batch now and schedule a visual review after installation.'
• C'We will clean the board surfaces but leave the soldering process unchanged.'
• D'We will raise the supply voltage and treat normal operation as proof that the joints are…

Which of the following closing paragraphs is most appropriate for a formal engineering technical proposal requesting administrative authorization?

• AIn summary, the evidence presented supports the proposed telemetry upgrade. We respectful…
• BThe proposal describes a possible telemetry upgrade, and approval would probably be usefu…
• CThe upgrade must be approved immediately because no further review is necessary.
• DWe have included many details above and look forward to hearing what you think about them.

Why is the use of vague pronoun references (such as 'this' or 'it' without an unambiguous noun antecedent) discouraged in technical engineering reports?

• AIt creates dangerous ambiguity regarding which component, parameter, or failure is being…
• BIt causes word processing software to automatically flag the document as invalid.
• CIt prevents mathematical equations from being compiled into the appendix.
• DIt is prohibited because technical reports must never contain pronouns of any kind.

Complete the technical dialogue: Software Engineer: 'The autonomous guidance algorithm encountered a floating-point division by zero during simulation.' Systems Lead: '_______'

• A'Implement an exception handling guard condition to verify that the denominator is non-ze…
• B'Repeat the same calculation without recording the denominator value.'
• C'Remove the simulation test so that the error is no longer reported.'
• D'Replace every zero in the data set with one without checking its meaning.'

Which sentence in a formal technical enquiry to an equipment vendor expresses urgency politely and professionally?

• ADue to project scheduling constraints, we would greatly appreciate receiving your technic…
• BSend us the quote right now or we will cancel the entire procurement contract immediately.
• CWe need the numbers ASAP because our supervisor is angry about delays.
• DDrop whatever you are doing and email us the motor price list today.