Mechanical Engineering quiz
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Which mechanical ratio compares object speed to the local sound speed?
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More questions about Mechanical Engineering
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Which simple mechanical machine uses a fulcrum to multiply input force?
Answer: lever
Why: Moving the pivot closer to the load multiplies force but costs distance, so the work done never comes out ahead.
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Which power unit is equal to one billion watts?
Answer: Gigawatt
Why: In Back to the Future, Doc Brown says the DeLorean needs 1.21 gigawatts, pronouncing it jigowatts.
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What happens to nitinol alloys when they are heated after being bent?
Answer: They return to their original shape
Why: Its name packs in nickel, titanium and the Naval Ordnance Laboratory, where a bent strip refolded itself under a pipe lighter in 1961.
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Why were ball bearings popularized during the late 19th century?
Answer: Bicycle development
Why: Jules Suriray patented a radial ball bearing in 1869; it was fitted to the bicycle James Moore rode to win the first road race, Paris to Rouen.
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Which mechanism lets a car's outer wheels turn faster than the inner ones?
Answer: differential
Why: French watchmaker Onésiphore Pecqueur designed one for a steam wagon in 1827 and patented it in 1828; the car was never built.
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Which polymer withstands the highest continuous temperature?
Answer: Polyimide
Why: Vespel polyimide holds near 300 C continuously and survives brief spikes past 480 C, while PEEK and PTFE both stop around 260 C.
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