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






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






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






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






5. Psi - newtons - pascals






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






7. 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 (






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






9. 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






10. Body in motion (car)






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






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






13. One that pushes on an object






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






15. Force/Area






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






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






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






20. Force x Distance






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






22. Force without machine/Force with machine






23. Piston travels up and both plugs are closed






24. Compression-Tension-Shear






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






26. (Force)(Distance)/Seconds






27. Ignition - power stroke






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






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






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






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






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






33. What we are studying






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






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






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






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






39. 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






40. Describes how applied forces bring a body into motion






41. Mass x acceleration






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






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






44. 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






45. 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






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






47. Often a free body has _______ acting on it






48. Exhaust






49. Air is drawn in






50. 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