Test your basic knowledge |

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. A combination of components






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






3. Exhaust






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






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






6. Brake pedal and linkage - Master Cylinder - Wheel cylinders (4) - Hydraulic lines - Hydraulic fluid - Mechanical advantage is provided by the foot pedal to the booster (level) - A greater force is applied on the wheel cylinders than on the brake peda






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






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






9. Force x Distance






10. Length x Width






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






12. Exhaust of combustion products






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






14. 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






15. 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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16. 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






17. 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






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






19. Rotation will not occur - but translation might occur






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






21. Length / Time






22. When the fluid is in motion






23. Force/Area






24. A pull on an object






25. Combustion of fuel mixture ignited by spark plug






26. ...






27. Result of gravity acting on mass -The greater the mass - the greater the weight -Is a force -Units: lbs - N






28. Rotation may occur






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






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






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






32. The magnitude of something in a particular direction






33. What we are studying






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. Applied at an angle or parallel to a surface






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






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






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

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39. Piston travels up and both plugs are closed






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






41. Liquid or gas






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






43. 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.






44. 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






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






46. 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






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






48. When fluid is at rest






49. The branch of science and engineering involving measurement






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