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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. Dimensions and units






2. Work/force or vertical distance/sloping distance






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






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






5. 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






6. Ignition - power stroke






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






8. A pull on an object






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






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






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






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






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






14. Liquid or gas






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






16. Body in motion (car)






17. Force x Distance






18. 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.






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






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






21. One that pushes on an object






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






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






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






26. Air is drawn in






27. (Force)(Distance)/Seconds






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






29. 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






30. What we are studying






31. 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






32. Rotation will not occur - but translation might occur






33. Static - Dynamic






34. 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






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






36. Compression-Tension-Shear






37. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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38. ...






39. Often a free body has _______ acting on it






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






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






42. Force without machine/Force with machine






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






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






45. The branch of science and engineering involving measurement






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






47. What we are not studying






48. 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






49. Exhaust of combustion products






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