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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. Length x Width






2. 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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3. Body at rest or is in equilibrium (wall)






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






5. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






6. 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






7. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






8. What we are studying






9. Force/Area






10. Force x Distance






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






12. Intake of fuel and air mix






13. Describes how applied forces bring a body into motion






14. Piston travels up and both plugs are closed






15. A combination of components






16. Length x Width x Height






17. Air is drawn in






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






19. A pull on an object






20. Ignition - power stroke






21. 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






22. Length / Time






23. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






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






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






26. Work/force or vertical distance/sloping distance






27. (pi) x (radius)^2






28. When fluid is at rest






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






30. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs






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






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






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






34. 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)






35. Psi - newtons - pascals






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






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






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






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






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






41. 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






42. 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






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






44. 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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45. 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






46. Weight/Time






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






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






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






50. One that pushes on an object