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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. 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






2. Same pressure - work - volume - Different forces and distances






3. (Force)(Distance)/Seconds






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






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






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






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






8. Weight/Time






9. Liquid or gas






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






11. Rotation will not occur - but translation might occur






12. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






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






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






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






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






17. 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.






18. 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






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






20. Describes how applied forces bring a body into motion






21. The branch of science and engineering involving measurement






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






23. Length x Width x Height






24. 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






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






26. 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






27. Body in motion (car)






28. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






29. 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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30. When the fluid is in motion






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






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






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






34. Ignition - power stroke






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






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






37. 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






38. Can be applied at a time on an object






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






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






41. Compression of fuel mix






42. What we are not studying






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






44. Used to measure or quantify -US Common: Absolute and Gravitational -SI: absolute






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






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






47. Rotation may occur






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






49. The magnitude of something in a particular direction






50. Combustion ignited by spark plug and materials are compressed