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






3. 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






4. Rotation may occur






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






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






7. Piston travels up and both plugs are closed






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






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






10. Combustion of fuel mixture ignited by spark plug






11. The branch of science and engineering involving measurement






12. Length x Width






13. Force without machine/Force with machine






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






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






16. 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






17. Exhaust of combustion products






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






19. Compression of fuel mix






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






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






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






23. Mass x acceleration






24. A pull on an object






25. Exhaust






26. If the force needed to operate the machine (input force) is less than the force being opposed or the load being moved (output force) -The ratio of the output force divided by the input force -If the number is greater than one - there is a mechanical






27. 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






28. Work/force or vertical distance/sloping distance






29. (Force)(Distance)/Seconds






30. Intake of fuel and air mix






31. Static - Dynamic






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






33. 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.






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






35. Force/Area






36. 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






37. Weight/Time






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






39. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






40. Combustion ignited by spark plug and materials are compressed






41. A combination of components






42. Length x Width x Height






43. 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






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






45. 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






46. Compression-Tension-Shear






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






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






49. When the work done by the effort exceeds the work done by the load - the load...






50. 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