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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. 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






2. Combustion ignited by spark plug and materials are compressed






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






4. Length / Time






5. Static - Dynamic






6. What we are not studying






7. Compression of fuel mix






8. Length x Width






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






10. Liquid or gas






11. (pi) x (radius)^2






12. ...






13. Force/Area






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. Psi - newtons - pascals






16. Weight/Time






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






18. The branch of science and engineering involving measurement






19. 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






20. Force without machine/Force with machine






21. 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






22. (Force)(Distance)/Seconds






23. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






24. A pull on an object






25. Dimensions and units






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






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






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






29. 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






30. 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






31. 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






32. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






33. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline






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






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






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






37. When fluid is at rest






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






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






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






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






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






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






44. 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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45. Piston travels up and both plugs are closed






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






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






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






49. Exhaust






50. Describes how applied forces bring a body into rest or equilibrium






Can you answer 50 questions in 15 minutes?



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