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






2. (pi) x (radius)^2






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






4. One that pushes on an object






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






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






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






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






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






10. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






11. The branch of science and engineering involving measurement






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






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






14. 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






15. 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.






16. (Force)(Distance)/Seconds






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






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






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






22. Psi - newtons - pascals






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






24. Piston travels up and both plugs are closed






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






26. Length x Width






27. Compression of fuel mix






28. The magnitude of something in a particular direction






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






30. 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






31. Exhaust






32. Air is drawn in






33. 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






34. When the moving fluid is a gas






35. Force x Distance






36. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






37. A combination of components






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






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






40. Length / Time






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






42. Static - Dynamic






43. Describes a physical property of anything - What we are measuring






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. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






47. 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






48. What we are not studying






49. A^2+b^2=c^2






50. Mass x acceleration