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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. When fluid is at rest






2. 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






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






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






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






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






7. Liquid or gas






8. 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 (






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






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






11. Length / Time






12. Force x Distance






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






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






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






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






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






18. Ignition - power stroke






19. Applied at an angle or parallel to a surface






20. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






21. Static - Dynamic






22. 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






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






24. 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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25. 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






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






27. Body at rest or is in equilibrium (wall)






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






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






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






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






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






33. Exhaust of combustion products






34. ...






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






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






37. Work/force or vertical distance/sloping distance






38. Air is drawn in






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






40. 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






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. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






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






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






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






46. Can be applied at a time on an object






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






48. Piston travels up and both plugs are closed






49. A pull on an object






50. When the moving fluid is a gas