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North Rhine-Westphalia Abitur Technology - independent engineering foundations study materials
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North Rhine-Westphalia Abitur Technology - independent engineering foundations practice questions

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Question 1Materials, testing and selection

What does 'Zugfestigkeit' (tensile strength) of a material measure?

  1. The maximum stress a material can withstand while being stretched before failing Correct answer.
  2. The material's electrical conductivity
  3. The material's exact melting temperature
  4. The material's color under stress

Explanation

Tensile strength quantifies the maximum tensile (pulling) stress a material can endure before breaking, a key mechanical property in structural design.

Question 2Materials, testing and selection

What does a bar chart of material tensile strength values across several materials, given as exam data, typically require students to do?

  1. Compare and interpret the relative strength values to justify a material choice for a specific application Correct answer.
  2. Ignore the chart and rely purely on memorized values
  3. Assume every material listed has identical strength with no real difference
  4. Calculate the chart's total page count

Explanation

Data-based Technik tasks typically require comparing given material property values (like tensile strength) to justify an appropriate material choice for a specified engineering application.

Question 3Materials, testing and selection

What is a 'Werkstoffprüfung' (materials testing) procedure used for?

  1. Empirically determining a material's mechanical properties, such as strength or hardness, through standardized tests Correct answer.
  2. Only checking a material's price on the open market
  3. Determining a material's country of origin exclusively
  4. Assessing a material's visual appeal for marketing purposes only

Explanation

Materials testing (e.g. tensile tests, hardness tests) empirically measures a material's mechanical properties under standardized, controlled conditions, informing engineering design decisions.

Question 4Materials, testing and selection

What is 'Härte' (hardness) of a material, as an engineering property?

  1. A measure of a material's resistance to localized plastic deformation, such as scratching or indentation Correct answer.
  2. A measure of a material's color intensity
  3. A measure of a material's electrical conductivity
  4. A measure of a material's exact price per kilogram

Explanation

Hardness measures a material's resistance to localized plastic deformation, commonly tested via scratch or indentation methods (e.g. Brinell, Rockwell, Vickers hardness tests).

Question 5Materials, testing and selection

What is 'Korrosion' (corrosion), such as rusting of iron, an example of?

  1. A chemical degradation process where a material reacts with its environment (e.g. oxygen and moisture), weakening it over time Correct answer.
  2. A purely mechanical wear process with no chemical reaction involved
  3. A deliberate manufacturing step to strengthen metal
  4. A process that only affects plastic materials, never metals

Explanation

Corrosion is a chemical (often electrochemical) degradation process, such as iron reacting with oxygen and moisture to form rust, which weakens the material's structural integrity over time.

Question 6Materials, testing and selection

Why might galvanizing (zinc-coating) steel be used as a corrosion protection method, connecting to earlier redox chemistry concepts?

  1. Zinc corrodes preferentially (sacrificially) compared to iron, protecting the underlying steel Correct answer.
  2. Zinc has no chemical reactivity whatsoever and simply blocks all contact physically with no electrochemical role
  3. Galvanizing makes steel weigh significantly less
  4. Galvanizing changes steel's color with no functional benefit

Explanation

As in the earlier redox/electrochemistry context, zinc's more negative reduction potential means it corrodes preferentially (sacrificially), protecting the underlying steel from rusting.

Question 7Materials, testing and selection

What does Hooke's Law describe, as relevant to spring/elastic material behavior in Konstruktion?

  1. Within the elastic limit, the force needed to extend or compress a spring is proportional to the displacement (F = k·x) Correct answer.
  2. A spring's force is always constant regardless of displacement
  3. A material never returns to its original shape after any deformation
  4. Force and displacement have no mathematical relationship at all

Explanation

Hooke's Law states that, within the elastic limit, the restoring force of a spring is directly proportional to its displacement from equilibrium, expressed as F = k·x, where k is the spring constant.

Question 8Materials, testing and selection

What is a 'Werkstoffkennwert' (material characteristic value), such as density or thermal conductivity, used for in Konstruktion decisions?

  1. Providing quantitative data engineers use to compare and select appropriate materials for a specific application Correct answer.
  2. Serving as a purely decorative label with no engineering use
  3. Determining a material's market price exclusively
  4. Recording only the material's supplier company name

Explanation

Material characteristic values (density, thermal conductivity, tensile strength, etc.) give engineers quantitative data to compare materials and select the most suitable one for a given application's requirements.

Question 9Statics, strength and mechanical transmission

What is a 'Lastfall' (load case) analysis used for in structural/mechanical design?

  1. Evaluating how a structure or component behaves under specific expected forces and loading conditions Correct answer.
  2. Determining the exact color scheme of the final product
  3. Calculating a company's annual tax obligations
  4. Choosing the font used in the technical drawing's title block

Explanation

Load case analysis examines how a structure responds to specific anticipated forces (e.g. static weight, wind, dynamic loads), ensuring the design can safely withstand real-world conditions.

Question 10Statics, strength and mechanical transmission

What does 'CAD' (computer-aided design) refer to in modern Konstruktion practice?

  1. Using specialized software to create, modify, and analyze technical designs digitally Correct answer.
  2. A manual hand-drafting technique using only pencil and paper
  3. A type of manufacturing material
  4. A network security protocol

Explanation

CAD refers to the use of specialized computer software to create, edit, and analyze precise technical designs, largely replacing traditional manual drafting in modern engineering practice.

Question 11Statics, strength and mechanical transmission

What is a 'Prototyp' (prototype) in the product development process?

  1. An early working model of a product used to test and validate a design before full production Correct answer.
  2. The final mass-produced version sold to consumers
  3. A synonym for the finished marketing brochure
  4. A type of manufacturing defect

Explanation

A prototype is an early sample or model built to test a design's function, form, or manufacturability before committing to full-scale production.

Question 12Statics, strength and mechanical transmission

What is the mechanical advantage of a simple lever, in principle, based on?

  1. The ratio of the distances from the fulcrum to the applied force and to the load (longer effort arm gives greater advantage) Correct answer.
  2. The color of the lever material
  3. The exact temperature of the surrounding environment
  4. The number of people using the lever simultaneously

Explanation

A lever's mechanical advantage depends on the ratio of the lever arm lengths on either side of the fulcrum: a longer effort arm relative to the load arm provides greater mechanical advantage.

Question 13Statics, strength and mechanical transmission

What is a 'Getriebe' (gear/transmission system) used for in mechanical engineering?

  1. Transmitting and modifying rotational speed, torque, or direction between components Correct answer.
  2. Only providing decorative surface texture to a machine
  3. Storing large volumes of digital data
  4. Measuring atmospheric pressure

Explanation

A Getriebe (gear system/transmission) transfers rotational motion between components while typically changing speed, torque, or direction as needed for the application.

Question 14Statics, strength and mechanical transmission

A driving gear has 20 teeth and meshes with a driven gear of 40 teeth. What is the gear ratio (driven:driving)?

  1. 2:1 Correct answer.
  2. 1:2
  3. 20:1
  4. 1:20

Explanation

Gear ratio = driven teeth / driving teeth = 40/20 = 2, so the ratio is 2:1 (the driven gear turns at half the speed of the driving gear, with double the torque).

Question 15Statics, strength and mechanical transmission

Why might an engineer choose an aluminum alloy over steel for an aircraft component?

  1. Aluminum alloys typically offer a much lower density (lighter weight) relative to their strength, important for aviation Correct answer.
  2. Aluminum is always stronger than steel under all conditions
  3. Steel cannot be shaped into any complex geometries
  4. Weight is never a design consideration in aviation engineering

Explanation

Aluminum alloys generally have a significantly lower density than steel while still offering good strength, making them attractive for weight-sensitive applications like aircraft structures.

Question 16Statics, strength and mechanical transmission

What is a 'Diagramm der Kraft-Weg-Beziehung' (force-displacement diagram) used to analyze in Konstruktion?

  1. How much force is required to achieve a given displacement/deformation in a material or spring system Correct answer.
  2. The exact color gradient of a technical drawing
  3. The financial budget for a construction project
  4. The number of employees assigned to a design team

Explanation

A force-displacement diagram shows the relationship between applied force and resulting displacement or deformation, useful for analyzing springs, materials, and structural components.

Question 17Statics, strength and mechanical transmission

Why do engineers often use safety factors (Sicherheitsfaktoren) when designing load-bearing structures?

  1. To provide a margin above the calculated minimum required strength, accounting for uncertainties in materials, loads, and manufacturing Correct answer.
  2. To intentionally make structures weaker than necessary
  3. Because safety factors have no real engineering justification
  4. To eliminate the need for any material strength calculations at all

Explanation

Safety factors provide an intentional margin above the theoretically calculated minimum required strength, accounting for real-world uncertainties in material properties, actual loads, and manufacturing variability.

Question 18Statics, strength and mechanical transmission

What is 'Drehmoment' (torque) in mechanical engineering?

  1. A rotational force, calculated as force multiplied by the perpendicular distance (lever arm) from the pivot point Correct answer.
  2. A measure of a material's color
  3. A synonym for electrical voltage
  4. The total number of gear teeth in a system

Explanation

Torque (Drehmoment) is a rotational force equal to the applied force multiplied by the perpendicular distance from the pivot/rotation axis (M = F x r).

Question 19Manufacturing, machining models and metrology

What is 'Fertigung' (manufacturing/production) in the context of the Produktion Inhaltsfeld?

  1. The process of transforming raw materials or components into a finished product Correct answer.
  2. The process of designing a product's initial concept sketches only
  3. The process of marketing a finished product to customers
  4. The process of disposing of a product at the end of its life

Explanation

Fertigung refers to the manufacturing processes that transform raw materials or semi-finished components into a completed product.

Question 20Manufacturing, machining models and metrology

What distinguishes 'Einzelfertigung' (unit/one-off production) from 'Serienfertigung' (series/mass production)?

  1. Einzelfertigung produces a single custom item; Serienfertigung produces many identical items using repeatable processes Correct answer.
  2. Both terms describe exactly the same manufacturing approach
  3. Einzelfertigung always produces more items than Serienfertigung
  4. Serienfertigung only applies to food products

Explanation

Einzelfertigung involves producing a single, often custom-made item (e.g. a bespoke machine), while Serienfertigung uses standardized, repeatable processes to produce large quantities of identical products.

Question 21Manufacturing, machining models and metrology

What is 'Qualitätskontrolle' (quality control) in a production process?

  1. Systematically inspecting products or processes to ensure they meet defined standards and specifications Correct answer.
  2. Randomly discarding half of all manufactured products with no inspection
  3. A marketing technique with no technical basis
  4. A synonym for the total number of workers on a production line

Explanation

Quality control involves systematic inspection and testing of products or processes against defined standards, helping catch defects and maintain consistent product quality.

Question 22Manufacturing, machining models and metrology

What is 'Losgröße' (batch size) in production planning?

  1. The number of identical units produced together in a single production run Correct answer.
  2. The physical weight of a single unit
  3. The exact selling price of a product
  4. The number of different colors a product is offered in

Explanation

Batch size (Losgröße) refers to the quantity of identical items manufactured together in one continuous production run before the process changes over to a different product or setup.

Question 23Manufacturing, machining models and metrology

Which ministry administers the NRW Zentralabitur, including Technik?

  1. Ministerium für Schule und Bildung des Landes Nordrhein-Westfalen (MSB NRW) Correct answer.
  2. Bundesministerium für Bildung und Forschung (BMBF)
  3. Kultusministerkonferenz (KMK) directly
  4. Ministerium für Schule und Bildung Niedersachsen

Explanation

The Zentralabitur in NRW, including Technik, is administered by the state's own Ministerium für Schule und Bildung (MSB NRW).

Question 24Manufacturing, machining models and metrology

What is the minimum total Gesamtqualifikation score required to pass the NRW Abitur under § 29 APO-GOSt?

  1. 300 of 900 points (Block I ≥200/600, Block II ≥100/300) Correct answer.
  2. 500 of 900 points
  3. 150 of 900 points
  4. 300 of 600 points

Explanation

Under § 29 APO-GOSt, candidates need at least 300 of 900 total points, split into at least 200 of 600 in Block I and at least 100 of 300 in Block II.

Question 25Manufacturing, machining models and metrology

What safety principle is emphasized when working with machine tools in a school Technik workshop?

  1. Following established safety protocols (protective equipment, machine guards, supervised operation) to prevent injury Correct answer.
  2. Operating all machines without any safety guards for faster results
  3. Ignoring manufacturer instructions entirely
  4. Allowing unsupervised student use of all high-risk machinery

Explanation

School Technik workshops emphasize strict adherence to safety protocols, including protective equipment, machine guards, and supervised operation, to prevent injury when working with tools and machinery.

Question 26Manufacturing, machining models and metrology

What does 'Nachhaltigkeit' (sustainability) mean in the context of modern engineering and production decisions?

  1. Designing and producing in ways that minimize long-term environmental and resource impact Correct answer.
  2. Maximizing short-term profit with no regard for environmental impact
  3. A term used only in Biologie, never in Technik
  4. Producing as much waste as possible to boost the economy

Explanation

Sustainability in engineering emphasizes minimizing environmental impact, conserving resources, and considering a product's full lifecycle, increasingly integrated into modern Technik curricula.

Question 27Manufacturing, machining models and metrology

What is 'Recycling' in the context of production and materials engineering?

  1. Reprocessing used materials or products to create new usable materials, reducing waste and raw material demand Correct answer.
  2. Permanently disposing of all used materials in landfills with no reuse
  3. A synonym for manufacturing a completely new, unrelated product
  4. A process exclusive to electronic devices, never metals or plastics

Explanation

Recycling involves reprocessing used materials (metals, plastics, etc.) into usable raw materials again, reducing both waste and the demand for virgin raw materials.

Question 28Manufacturing, machining models and metrology

What is a 'Prozessdiagramm' (process diagram/flowchart) used to represent in Produktion?

  1. The sequential steps and decision points involved in a manufacturing or production process Correct answer.
  2. The chemical composition of raw materials only
  3. A financial balance sheet
  4. A musical composition's structure

Explanation

A process diagram visually maps out the sequential steps, decision points, and flow of a manufacturing or production process, helping to plan and analyze production workflows.

Question 29Manufacturing, machining models and metrology

What is 'Additive Fertigung' (additive manufacturing / 3D printing) as a modern production method?

  1. Building up a part layer by layer from a digital model, rather than removing material from a larger block Correct answer.
  2. Removing material from a solid block through cutting or drilling
  3. A method exclusive to producing paper documents
  4. A synonym for hand-forging metal with a hammer

Explanation

Additive manufacturing (3D printing) constructs objects by adding material layer by layer based on a digital model, in contrast to traditional subtractive methods that remove material.

Question 30Manufacturing, machining models and metrology

What is 'Automatisierung' (automation) in a production context?

  1. Using technology (machines, control systems) to perform tasks with minimal direct human intervention Correct answer.
  2. Ensuring that every single production step is done entirely by hand
  3. A synonym for shutting down a factory permanently
  4. A term used exclusively in agriculture, never manufacturing

Explanation

Automation involves using machinery, robotics, and control systems to carry out production tasks with reduced or no direct human intervention, increasing efficiency and consistency.

Question 31Manufacturing, machining models and metrology

What is a common trade-off engineers must consider when selecting a manufacturing process for a given product's expected production volume?

  1. Higher setup costs for automated/tooling-intensive processes may only be justified by producing large volumes to spread costs over more units Correct answer.
  2. Manufacturing process choice never affects unit cost regardless of volume
  3. Every manufacturing process has an identical setup cost and speed
  4. Production volume has no relationship to the appropriate choice of manufacturing method

Explanation

Processes with high upfront tooling/automation costs become more cost-effective per unit only when spread across large production volumes, a classic engineering economics trade-off in Produktion planning.

Question 32Manufacturing, machining models and metrology

What is 'Losfertigung' with a small batch size generally more suitable for compared to large-scale mass production?

  1. Custom or low-volume products where high automation setup costs are not economically justified Correct answer.
  2. Products that will be manufactured in the millions with no customization
  3. Only food products, never mechanical parts
  4. Products with absolutely no quality requirements

Explanation

Small batch production (Losfertigung) suits custom, specialized, or lower-volume products where the high fixed costs of full automation/tooling for mass production would not be economically justified.

Question 33Manufacturing, machining models and metrology

What is 'Rapid Prototyping' most closely associated with in modern product development?

  1. Quickly producing a physical model (often via 3D printing) to test form, fit, or function early in development Correct answer.
  2. Producing the final consumer product at full manufacturing scale
  3. A synonym for market research surveys
  4. A term used exclusively in software development, never physical products

Explanation

Rapid prototyping uses techniques like 3D printing to quickly produce physical models for early testing of form, fit, and function, accelerating the iterative design process.

Question 34Manufacturing, machining models and metrology

What is the purpose of a 'Prüfprotokoll' (test/inspection report) in a quality control process?

  1. Documenting the results of tests/inspections performed on a product or process for traceability and verification Correct answer.
  2. Recording a company's advertising campaign results
  3. Listing employees' vacation schedules
  4. Serving only as a decorative certificate with no factual content

Explanation

A Prüfprotokoll formally documents test/inspection results, supporting traceability, quality assurance, and verification that a product meets required specifications.

Question 35Manufacturing, machining models and metrology

What is a 'Stichprobenprüfung' (sample-based inspection) in quality control, as distinct from inspecting every single unit?

  1. Testing a representative subset of produced units to infer the overall batch's quality, balancing thoroughness with cost/time Correct answer.
  2. Testing 100% of every unit produced with no exceptions ever
  3. Testing no units at all and assuming quality is always perfect
  4. Testing only units that have already failed

Explanation

Sample-based inspection tests a representative subset of a production batch to make statistically informed inferences about overall quality, balancing inspection thoroughness against time and cost constraints.

Question 36Manufacturing, machining models and metrology

What is 'Ausschuss' (rejects/scrap) in a manufacturing process?

  1. Manufactured units that fail to meet quality specifications and must be reworked, recycled, or discarded Correct answer.
  2. The total revenue earned from a production run
  3. A synonym for the final approved product ready for sale
  4. A term used exclusively for describing employee performance reviews

Explanation

Ausschuss refers to manufactured units that do not meet required quality specifications, requiring rework, recycling, or disposal, and represents a key metric tracked in quality/production management.

Question 37Manufacturing, machining models and metrology

What role does 'Wartung' (maintenance) play in the lifecycle of a technical system, such as a machine or vehicle?

  1. Regularly inspecting and servicing a system to preserve its function, prevent failures, and extend its useful life Correct answer.
  2. Permanently disabling the system after its first use
  3. Only applying to systems that have already completely failed
  4. A term used exclusively for software, never mechanical systems

Explanation

Maintenance involves regular inspection, servicing, and repair to preserve a technical system's function, prevent unexpected failures, and extend its operational lifespan.

Question 38Manufacturing, machining models and metrology

What is a key reason engineers perform a 'Kostenanalyse' (cost analysis) alongside technical feasibility during Konstruktion and Produktion planning?

  1. A technically excellent design must also be economically viable to justify production and market success Correct answer.
  2. Cost has no bearing on whether a design is ultimately manufactured
  3. Technical feasibility alone always guarantees commercial success with no cost consideration needed
  4. Cost analysis is performed only after a product has already been sold to customers

Explanation

Even a technically sound design must be economically viable - cost analysis alongside technical feasibility ensures a product can be produced and sold profitably, a standard engineering practice.

Question 39Manufacturing, machining models and metrology

What does 'Wiederverwendbarkeit' (reusability) of a component contribute to in sustainable product design?

  1. Reducing the need for new raw materials and waste by allowing components to serve multiple purposes or lifecycles Correct answer.
  2. Making a product harder to repair or reuse in any way
  3. Guaranteeing a product's failure after a single use
  4. A concept irrelevant to modern Technik curricula

Explanation

Designing for reusability allows components to be used across multiple products or lifecycles, reducing raw material demand and waste - a key aspect of sustainable engineering design.

Question 40Measurement, feedback, PLC and automation

What is the fundamental difference between 'Steuerung' (open-loop control) and 'Regelung' (closed-loop feedback control)?

  1. Steuerung has no feedback loop to check the actual output; Regelung continuously measures output and corrects deviations from a target value Correct answer.
  2. Steuerung and Regelung are identical concepts with different names only
  3. Regelung never uses any sensors at all
  4. Steuerung always requires more components than Regelung

Explanation

Steuerung (open-loop control) applies a predetermined control action without checking the actual result, while Regelung (closed-loop control) continuously measures the output and feeds it back to correct any deviation from the desired target value.

Question 41Measurement, feedback, PLC and automation

What is a classic real-world example of a Steuerung (open-loop control) system?

  1. A washing machine that runs a fixed timed program regardless of how clean the clothes actually get Correct answer.
  2. A home thermostat that continuously measures room temperature and adjusts the heater accordingly
  3. A cruise control system that continuously monitors and adjusts a car's speed
  4. A thermostatic radiator valve responding to measured room temperature

Explanation

A washing machine running a fixed timed program without measuring the actual cleanliness of the clothes is a classic open-loop (Steuerung) example, since there is no feedback loop correcting the process based on the actual outcome.

Question 42Measurement, feedback, PLC and automation

What is a classic real-world example of a Regelung (closed-loop feedback control) system?

  1. A home thermostat that measures room temperature and switches the heater on/off to maintain a set target Correct answer.
  2. A traffic light that switches on a fixed timer with no sensors
  3. A washing machine running a preset fixed-time cycle
  4. A simple light switch with only on/off states and no sensing

Explanation

A thermostat continuously measures the actual room temperature and adjusts heating to correct deviations from the target - the defining feature of closed-loop (Regelung) feedback control.

Question 43Measurement, feedback, PLC and automation

What is a 'Sensor' in a control/regulation system?

  1. A device that measures a physical quantity (e.g. temperature, pressure) and converts it into a usable signal Correct answer.
  2. A device that always outputs mechanical motion, never a signal
  3. A synonym for a power supply unit
  4. A component used only for data encryption

Explanation

A sensor detects a physical quantity, such as temperature or pressure, and converts it into an electrical or digital signal that a control system can process.

Question 44Measurement, feedback, PLC and automation

What is an 'Aktor' (actuator) in a control/regulation system?

  1. A device that converts a control signal into physical action, such as movement or a change in state Correct answer.
  2. A device that only measures physical quantities, producing no action
  3. A synonym for a sensor
  4. A component used exclusively for storing data

Explanation

An actuator converts a control signal (electrical, hydraulic, or pneumatic) into physical action, such as movement, opening/closing a valve, or applying force.

Question 45Measurement, feedback, PLC and automation

What is a 'Regelkreis' (control loop) diagram used to represent?

  1. The cyclical path of signal flow among the controlled system, sensor, controller, and actuator in a feedback system Correct answer.
  2. A single, isolated component with no connections to other parts
  3. A financial budget planning tool
  4. A network topology unrelated to control engineering

Explanation

A Regelkreis diagram visually represents the cyclical flow of information in a closed-loop system: from the controlled process, through a sensor, to a controller, and back through an actuator to affect the process.

Question 46Measurement, feedback, PLC and automation

What is the 'Sollwert' (setpoint/target value) in a control loop?

  1. The desired target value that the control system attempts to maintain or reach Correct answer.
  2. The actual measured value read from the sensor at any given moment
  3. The physical size of the actuator
  4. The company's total production output for the year

Explanation

The Sollwert (setpoint) is the desired target value a control system aims to achieve or maintain, such as a thermostat's target room temperature.

Question 47Measurement, feedback, PLC and automation

What is the 'Istwert' (actual value) in a control loop?

  1. The value currently measured by the sensor, reflecting the system's real current state Correct answer.
  2. The value the system aims to achieve in the future
  3. A fixed constant that never changes throughout operation
  4. The total cost of the control system's components

Explanation

The Istwert is the actual, currently measured value of the controlled quantity (e.g. current room temperature), which the control system compares against the Sollwert (target).

Question 48Measurement, feedback, PLC and automation

What does a 'Regelabweichung' (control deviation/error) represent?

  1. The difference between the setpoint (Sollwert) and the actual measured value (Istwert) Correct answer.
  2. The total energy consumed by the actuator
  3. The exact time it takes to manufacture a part
  4. The number of sensors installed in a system

Explanation

The Regelabweichung (control error) is calculated as Sollwert minus Istwert, representing how far the system currently is from its target and driving the corrective control action.

Question 49Measurement, feedback, PLC and automation

What is a potential downside of a poorly tuned closed-loop control system, such as excessive gain?

  1. It can overshoot the target value and oscillate instead of settling smoothly Correct answer.
  2. It will always immediately reach the exact target with zero delay and no side effects
  3. It becomes completely unaffected by any external disturbances
  4. It automatically corrects itself with no possibility of instability

Explanation

An improperly tuned control system, especially with excessive controller gain, can overshoot the target value and oscillate around it rather than settling smoothly, or in extreme cases become unstable.

Question 50Measurement, feedback, PLC and automation

What is a practical everyday example that illustrates a control loop used in classroom Technik demonstrations, such as a simple room-temperature model?

  1. A heater, a temperature sensor, and a controller that switches the heater on/off to maintain a set room temperature Correct answer.
  2. A calculator performing basic arithmetic with no sensors involved
  3. A printed book with no electronic components
  4. A simple decorative light with a fixed color and no sensor

Explanation

A basic heater-sensor-controller setup, maintaining a target room temperature, is a standard classroom example used to teach the Regelkreis concept concretely.