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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. Compression-Tension-Shear






2. Psi - newtons - pascals






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






4. Force x Distance






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






6. Work/force or vertical distance/sloping distance






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






8. 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






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






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






11. Static - Dynamic






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






13. When the fluid is in motion






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






15. 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






16. Allows comparison between different measuring systems and units - Necessary to market internationally






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






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






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






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






21. Intake of fuel and air mix






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






23. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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






25. 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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26. What we are studying






27. 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.






28. The magnitude of something in a particular direction






29. 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 (






30. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing






31. 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






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






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






34. Force without machine/Force with machine






35. Exhaust of combustion products






36. 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






37. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






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






39. What we are not studying






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






41. 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






42. Often a free body has _______ acting on it






43. (pi) x (radius)^2






44. Dimensions and units






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






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






47. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






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






49. Length x Width






50. Rotation will not occur - but translation might occur







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