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Mechanical Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. When the work done by the effort exceeds the work done by the load - the load...






2. Force without machine/Force with machine






3. Air is drawn in






4. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






5. Rotation will not occur - but translation might occur






6. Liquid or gas






7. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






8. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






9. When the moving fluid is a gas






10. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us


11. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






12. A^2+b^2=c^2






13. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force






14. External Combustion engine -Only used in factories and plants (not used in cars)






15. When the sum of all forces and the sum of all moments both equal forces - No movement






16. Force x Distance






17. ICE generates electricity for electric battery -Electric motor turns wheels






18. Compression-Tension-Shear






19. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






20. Mass x acceleration






21. Fuel is injected and combusts due to temperature of compressed air






22. When fluid is at rest






23. Force and mass are proportional to each other (F=ma) -If F increases - so does acceleration -Force causes acceleration - More force means more acceleration - same mass - More mass means less acceleration - same force


24. Piston travels up and both plugs are closed






25. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






26. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs






27. The force simple machines use to do work on a single load or against a single force






28. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)






29. Can be applied at a time on an object






30. Intake of fuel and air mix






31. Movement along a line (reciprocal or linear motion) -Units: feet and meters






32. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






33. Describes how applied forces bring a body into rest or equilibrium






34. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






35. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components






36. Same pressure - work - volume - Different forces and distances






37. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






38. An indication of kinetic energy of mass at the molecular level






39. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






40. A pull on an object






41. A^2+b^2=c^2 - used to calculate vectors






42. Compression of fuel mix






43. A fluid power system uses hydraulics and a fluid under pressure to create a greater force than is applied






44. Applied at an angle or parallel to a surface






45. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute






46. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






47. Tells us how fast work is done - varies with time (more power is needed to do work in less time - and less power is needed to do work in more time) =Fd/s -Units: USA: ft- lb/s SI: watts (J/S)






48. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






49. Result of a force moving an object against a resistance through some distance in a desired direction -Work transfers energy -Work is a measure of what is done and not the effort applied - Done by lifting - pushing - rotating - or sliding -W=Fd -F=Amo






50. What we are studying