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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. Rotation may occur






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






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






4. 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






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






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






7. 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






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






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. 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






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


13. (pi) x (radius)^2






14. Work/force or vertical distance/sloping distance






15. 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 (






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






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






18. Can be applied at a time on an object






19. Force without machine/Force with machine






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






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






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






23. Psi - newtons - pascals






24. Compression-Tension-Shear






25. 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






26. ...






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






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






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






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






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






32. 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






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






34. Often a free body has _______ acting on it






35. Dimensions and units






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






37. 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


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






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






40. Static - Dynamic






41. Intake of fuel and air mix






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






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






44. 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






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


46. When the moving fluid is a gas






47. Force x Distance






48. Weight/Time






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






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