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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 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






2. Force x Distance






3. (Force)(Distance)/Seconds






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






5. Rotation will not occur - but translation might occur






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






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






8. 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.






9. Exhaust






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






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






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






13. A pull on an object






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






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






16. The magnitude of something in a particular direction






17. 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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18. One that pushes on an object






19. Force without machine/Force with machine






20. Applied at an angle or parallel to a surface






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






22. What we are studying






23. 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






24. Compression-Tension-Shear






25. Rotation may occur






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






27. Combustion of fuel mixture ignited by spark plug






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






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






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






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






32. When the moving fluid is a gas






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






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






35. (pi) x (radius)^2






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






37. 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 (






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






39. 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






40. 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






41. ...






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






43. Length / Time






44. Air is drawn in






45. Mass x acceleration






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






47. Compression of fuel mix






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






49. Length x Width x Height






50. Intake of fuel and air mix