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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. 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






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






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






4. Intake of fuel and air mix






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






6. Can be applied at a time on an object






7. 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






8. Mass x acceleration






9. 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 (






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






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






12. When the fluid is in motion






13. 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






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






15. Combustion of fuel mixture ignited by spark plug






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






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






18. ...






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






20. Force x Distance






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






22. Air is drawn in






23. 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






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






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






26. Exhaust of combustion products






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






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






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






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






31. Force without machine/Force with machine






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






33. Compression-Tension-Shear






34. 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






35. Weight/Time






36. Applied at an angle or parallel to a surface






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






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






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






40. The branch of science and engineering involving measurement






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






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






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






44. Describes how applied forces bring a body into motion






45. When the moving fluid is a gas






46. (Force)(Distance)/Seconds






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






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






49. 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






50. 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







Sorry!:) No result found.

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