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






2. 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






3. One that pushes on an object






4. A pull on an object






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






6. Force without machine/Force with machine






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






8. 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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9. Applied at an angle or parallel to a surface






10. Body in motion (car)






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






12. Combustion ignited by spark plug and materials are compressed






13. Can be applied at a time on an object






14. Describes how applied forces bring a body into motion






15. 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






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






17. Piston travels up and both plugs are closed






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






19. Force x Distance






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






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






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






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






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






25. Liquid or gas






26. Rotation will not occur - but translation might occur






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






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






29. 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






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






31. The branch of science and engineering involving measurement






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






33. Often a free body has _______ acting on it






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






35. 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






36. Length / Time






37. What we are not studying






38. (pi) x (radius)^2






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






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






41. Exhaust






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






43. Force/Area






44. Intake of fuel and air mix






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






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






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






49. 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






50. Rotation may occur