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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. Liquid or gas






2. Intake of fuel and air mixture - compression of mixture by piston






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






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






5. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human






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

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7. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2






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






9. Intake of fuel and air mix






10. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






11. Body in motion (car)






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






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






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






15. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






16. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






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






18. Weight/Time






19. Applied at an angle or parallel to a surface






20. ...






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






22. Three- dimensional property measured in units of length times length times length =length x width x height






23. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






24. When the work done by the effort exceeds the work done by the load - the load...






25. Exhaust






26. When the moving fluid is a gas






27. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2






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






29. Length / Time






30. Force/Area






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






32. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






33. Ignition - power stroke






34. (Force)(Distance)/Seconds






35. A pull on an object






36. Air is compressed - work is done on the system






37. Compression of fuel mix






38. Static - Dynamic






39. A combination of components






40. 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)






41. Varies by location (on earth) - distance (from earth) - and mass (of planet)






42. More compact (size of beer keg) - No valves -Benefits: fewer parts - lower engine weight Problems: seal - lower inertia forces -1 rotar=3 to 4 pistons






43. Describes how applied forces bring a body into motion






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






45. Dimensions and units






46. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






47. 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

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48. Piston travels up and exhaust valve opens. Combustion by product exhaustion






49. Mechanics is an application of math that describes how forces affect a body






50. Body at rest or is in equilibrium (wall)