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






2. Compression of fuel mix






3. 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.






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






5. Length x Width x Height






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






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






8. The branch of science and engineering involving measurement






9. Compression-Tension-Shear






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






11. Ignition - power stroke






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






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






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






15. 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)






16. Weight/Time






17. 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






18. 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






19. Mass x acceleration






20. Static - Dynamic






21. Psi - newtons - pascals






22. Describes how applied forces bring a body into motion






23. Can be applied at a time on an object






24. Translation (slide) -Rotate -Slide and Rotate Together






25. Applied at an angle or parallel to a surface






26. 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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27. A^2+b^2=c^2






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






29. Exhaust






30. Length x Width






31. Combustion of fuel mixture ignited by spark plug






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






33. 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






34. Force without machine/Force with machine






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






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






37. Rotation will not occur - but translation might occur






38. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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39. (Force)(Distance)/Seconds






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






41. 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






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






43. Movement along a line (reciprocal or linear motion) -Units: feet and meters






44. Combustion ignited by spark plug and materials are compressed






45. Varies by location (on earth) - distance (from earth) - and mass (of planet)






46. 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






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






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






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






50. 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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