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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. Often a free body has _______ acting on it






2. Can be applied at a time on an object






3. The branch of science and engineering involving measurement






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






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






6. Combustion ignited by spark plug and materials are compressed






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






8. 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.






9. 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






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






12. Rotation may occur






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






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






15. Describes how applied forces bring a body into motion






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






17. 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






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






19. ...






20. (Force)(Distance)/Seconds






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






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






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






26. Mass x acceleration






27. 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






28. Applied at an angle or parallel to a surface






29. 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






30. Liquid or gas






31. Force x Distance






32. Weight/Time






33. Intake of fuel and air mix






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






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






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






37. Exhaust






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






39. Body in motion (car)






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






41. Work/force or vertical distance/sloping distance






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

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43. Rotation will not occur - but translation might occur






44. Air is drawn in






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






46. Length / Time






47. 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)






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






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






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