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






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






3. Mechanics is an application of math that describes how forces affect a body






4. 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






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






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






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






8. The branch of science and engineering involving measurement






9. Force without machine/Force with machine






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






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






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






13. One that pushes on an object






14. 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






15. Force x Distance






16. Exhaust






17. Length x Width






18. When the moving fluid is a gas






19. 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)






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






21. A pull on an object






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






23. Psi - newtons - pascals






24. Can be applied at a time on an object






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






26. (Force)(Distance)/Seconds






27. Ignition - power stroke






28. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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29. Rotation will not occur - but translation might occur






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






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






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






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






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






36. Piston travels up and both plugs are closed






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






38. 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






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






40. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






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






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






43. (pi) x (radius)^2






44. 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






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






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






47. Air is drawn in






48. Weight/Time






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






50. 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