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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. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






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






3. 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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4. Air is compressed - work is done on the system






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






6. When the moving fluid is a gas






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






8. When the fluid is in motion






9. 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






10. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline






11. 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






12. If the force needed to operate the machine (input force) is less than the force being opposed or the load being moved (output force) -The ratio of the output force divided by the input force -If the number is greater than one - there is a mechanical






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






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






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






16. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






17. Force/Area






18. Piston travels up and both plugs are closed






19. Exhaust






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






21. Length x Width






22. 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)






23. Can be applied at a time on an object






24. Mass can neither by created nor destroyed - only transformed






25. ...






26. Compression of fuel mix






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






28. One that pushes on an object






29. Rotation will not occur - but translation might occur






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






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






32. 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






33. Length / Time






34. Describes a physical property of anything - What we are measuring






35. Mass x acceleration






36. Liquid or gas






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






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






39. 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






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






41. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






42. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N






43. When fluid is at rest






44. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width






45. 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.






46. Combustion of fuel mixture ignited by spark plug






47. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






48. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






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






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