Unit 7: B3 Product in practice
Topic 7.3: Mechanical systems applied Questions
Practice 18 exam-style questions for IB Design Technology Topic 7.3. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1State1 mark
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A 20-tooth driver drives a 40-tooth idler, which drives a 60-tooth gear. What is the overall ratio?
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Why is a 30:1 reduction usually built as two stages rather than one gear pair?
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How is the lift of a cam found from its drawing?
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A lever has the effort 800 mm from the fulcrum and the load 100 mm from it. What effort lifts a 600 N load?
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Why does moving a wheelbarrow's axle forward reduce the effort more than lengthening the handles?
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A 15-tooth driver meshes with a 60-tooth driven gear. What is the mechanical advantage?
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What does an idler gear do to the overall velocity ratio?
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Two mechanism stages of MA 5 and MA 4 are put in series. What is the overall MA?
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A pair of bolt cutters has 450 mm handles pivoting 30 mm from the jaw, feeding a second linkage of ratio 6. Apply mechanical advantage to find the jaw force from a 250 N hand force, and state what it costs.
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A drive has a velocity ratio of 5 and an input speed of 1,500 rpm. What is the output speed?
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A mechanism has a VR of 5 and a measured MA of 4. What is its efficiency?
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Three mechanism stages are each 95% efficient. Roughly what reaches the output?
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Why is a dwell needed on the feed cam of a sewing machine?
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A cordless drill motor runs at 12,000 rpm through a 10-tooth driver into a 40-tooth gear, which shares a shaft with a 12-tooth gear driving a 48-tooth gear. Apply velocity ratio to find the chuck speed and comment.
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A hoist has a velocity ratio of 30 and lifts a 1,500 N load with a 75 N effort. Apply the formulae to find the MA and the efficiency, and comment on whether it should be improved.
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A food mixer motor runs at 3,000 rpm and its paddle must turn at about 100 rpm in the SAME direction. Construct a suitable gear train and justify it.
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A sewing machine feeds the fabric one stitch length between needle strokes, using a cam on the lower shaft. Analyse the cam system.
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A wheelbarrow carries 900 N with the load 0.35 m from the axle and the handles 1.05 m from it. Apply the moment equation to find the effort and the MA, then recommend one change and calculate its effect.
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