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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. 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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2. 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






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






4. Compression-Tension-Shear






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






6. 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






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






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






9. Describes how applied forces bring a body into motion






10. (Force)(Distance)/Seconds






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






12. Body in motion (car)






13. The branch of science and engineering involving measurement






14. Rotation may occur






15. 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.






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






17. Liquid or gas






18. Length x Width






19. 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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20. External Combustion engine -Only used in factories and plants (not used in cars)






21. Length / Time






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






23. 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






24. A pull on an object






25. Weight/Time






26. ...






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






28. Compression of fuel mix






29. 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






30. Combustion of fuel mixture ignited by spark plug






31. Force x Distance






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






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






34. Force/Area






35. 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






36. Ignition - power stroke






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






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






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






40. When the moving fluid is a gas






41. Three- dimensional property measured in units of length times length times length =length x width x height






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






43. Air is drawn in






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






45. Combustion ignited by spark plug and materials are compressed






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






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






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






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






50. 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