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






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






3. Applied at an angle or parallel to a surface






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






5. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






6. Static - Dynamic






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






8. Mass x acceleration






9. Length x Width






10. Force without machine/Force with machine






11. Length / Time






12. (pi) x (radius)^2






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






14. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






15. Often a free body has _______ acting on it






16. (Force)(Distance)/Seconds






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






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






19. When the moving fluid is a gas






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

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21. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






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






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






25. Length x Width x Height






26. Rotation will not occur - but translation might occur






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






28. Air is drawn in






29. Compression-Tension-Shear






30. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human






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






32. The branch of science and engineering involving measurement






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






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






35. 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






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






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






38. 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






39. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






40. Force x Distance






41. Body in motion (car)






42. Combustion ignited by spark plug and materials are compressed






43. 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)






44. Ignition - power stroke






45. Compression of fuel mix






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






47. 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






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






49. What we are not studying






50. 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.