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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. 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






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






3. Combustion of fuel mixture ignited by spark plug






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






5. 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






6. Mass x acceleration






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






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






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






10. Piston travels up and both plugs are closed






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






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






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






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






15. When the moving fluid is a gas






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






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






18. 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)






19. Exhaust






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






21. Ignition - power stroke






22. Length / Time






23. What we are studying






24. Describes how applied forces bring a body into motion






25. A pull on an object






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






27. Body in motion (car)






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






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






30. Liquid or gas






31. Length x Width x Height






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






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






34. Compression-Tension-Shear






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






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






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






38. 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






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






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






41. What we are not studying






42. Often a free body has _______ acting on it






43. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)






44. Describes how applied forces bring a body into rest or equilibrium






45. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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46. Static - Dynamic






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






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






49. Compression of fuel mix






50. Force x Distance