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






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






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






4. The branch of science and engineering involving measurement






5. Dimensions and units






6. Psi - newtons - pascals






7. Piston travels up and both plugs are closed






8. 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






9. Applied at an angle or parallel to a surface






10. When the moving fluid is a gas






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






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






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






14. Describes how applied forces bring a body into motion






15. Often a free body has _______ acting on it






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






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






18. Mass x acceleration






19. 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






20. When fluid is at rest






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






22. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






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






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






25. 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






26. Work/force or vertical distance/sloping distance






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






28. 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






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






30. (Force)(Distance)/Seconds






31. Force/Area






32. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






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






34. What we are not studying






35. Weight/Time






36. 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






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






38. The magnitude of something in a particular direction






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






40. 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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41. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






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






43. 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)






44. A combination of components






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






46. Compression of fuel mix






47. 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






48. One that pushes on an object






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






50. Liquid or gas