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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. Combustion ignited by spark plug and materials are compressed






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

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






4. 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






5. Force/Area






6. 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






7. Translation (slide) -Rotate -Slide and Rotate Together






8. 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






9. 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






10. Ignition - power stroke






11. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2






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






13. When fluid is at rest






14. Force without machine/Force with machine






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






16. 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






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






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






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






20. 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






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






22. Compression-Tension-Shear






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






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






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






26. Applied at an angle or parallel to a surface






27. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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28. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






29. One that pushes on an object






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






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






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






33. 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






34. Combustion of fuel mixture ignited by spark plug






35. Weight/Time






36. What we are studying






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






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






40. Often a free body has _______ acting on it






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. Rotation may occur






43. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






44. Liquid or gas






45. 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.






46. Air is drawn in






47. The magnitude of something in a particular direction






48. Psi - newtons - pascals






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






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