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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. What we are studying






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






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






5. Static - Dynamic






6. Body in motion (car)






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






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

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






10. 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.






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






12. The branch of science and engineering involving measurement






13. 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






14. Force without machine/Force with machine






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






16. 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






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






18. Length x Width






19. 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






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






21. 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)






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






23. Length / Time






24. Psi - newtons - pascals






25. Work/force or vertical distance/sloping distance






26. 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






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






28. 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






29. 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






30. When the fluid is in motion






31. Air is drawn in






32. When the moving fluid is a gas






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






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






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






36. Mass x acceleration






37. 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






38. A combination of components






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






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






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






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






43. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






44. Combustion ignited by spark plug and materials are compressed






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






46. Exhaust of combustion products






47. 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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48. Intake of fuel and air mixture - compression of mixture by piston






49. 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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50. 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







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