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






2. Dimensions and units






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






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






5. 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






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






7. Exhaust






8. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






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






10. Length / Time






11. ...






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






13. When fluid is at rest






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






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






16. What we are not studying






17. Applied at an angle or parallel to a surface






18. 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






19. 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






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






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






22. Can be applied at a time on an object






23. 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






24. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






25. Liquid or gas






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






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






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






29. Weight/Time






30. One that pushes on an object






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






32. What we are studying






33. Compression-Tension-Shear






34. Piston travels up and both plugs are closed






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






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






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






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






39. Rotation will not occur - but translation might occur






40. Ignition - power stroke






41. Psi - newtons - pascals






42. A pull on an object






43. 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)






44. 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






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






46. Length x Width x Height






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






48. Force x Distance






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






50. Rotation may occur