Unit 3: A3 Product in theory
Topic 3.4: Electronic systems Questions
Practice 20 exam-style questions for IB Design Technology Topic 3.4. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
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A machine must run only when both safety buttons are pressed. Which gate is needed?
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How many rows does a two-input truth table have?
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Which change reduces a product's standby power?
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What is lost when an analogue signal is converted to digital?
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How should 4,700 Ω be written using an SI multiplier?
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Why must an LED have a resistor in series with it?
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What does a thermistor give a circuit?
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Which behaviour is essentially free in program control but expensive in analogue?
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Which output device best alerts a user who is not looking at the product?
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Unlock Question10Justify6 marks
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A hospital infusion pump must alert staff when a line is blocked. Justify the output devices you would specify.
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What is the purpose of feedback in a closed-loop system?
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What does an operational amplifier amplify?
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A washing machine weighs its load and uses less water for a small one. Which benefit is this?
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A connected kitchen scale weighs to the nearest gram and sends the reading to a phone. Describe the role of the op-amp in it.
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A circuit symbol shows a resistor box with an arrow drawn across it. What is it?
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An automatic hand dryer switches on when hands are placed beneath it. Describe it as an electronic system, including its feedback.
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A 12 V supply is connected across a 240 Ω resistor. What current flows?
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Why can adding an electronic control board shorten a washing machine's life?
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A school replaces its analogue intercom with a digital one running over its computer network. Analyse the two systems against each other.
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What must sit between a microcontroller pin and a small DC motor?
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