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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. (Force)(Distance)/Seconds






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






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






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






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. 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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7. Applied at an angle or parallel to a surface






8. Combustion ignited by spark plug and materials are compressed






9. One that pushes on an object






10. 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






11. Describes how applied forces bring a body into motion






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






13. Liquid or gas






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






15. Air is drawn in






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






17. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






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






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






20. Force x Distance






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






22. 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)






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






24. Intake of fuel and air mix






25. Body in motion (car)






26. 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.






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






28. Combustion of fuel mixture ignited by spark plug






29. 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






30. The magnitude of something in a particular direction






31. Exhaust of combustion products






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






33. Mass x acceleration






34. Often a free body has _______ acting on it






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






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






37. Psi - newtons - pascals






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






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






40. 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






41. Piston travels up and both plugs are closed






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






43. When the fluid is in motion






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






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






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






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






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






49. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






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

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