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






2. 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






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






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






5. 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






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






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






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






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

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10. A change in velocity over time -Unites: USA- ft/s^2 and SI: m/s^2






11. Air is drawn in






12. Liquid or gas






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






14. Compression-Tension-Shear






15. 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






16. Ignition - power stroke






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






18. Result of a force moving an object against a resistance through some distance in a desired direction -Work transfers energy -Work is a measure of what is done and not the effort applied - Done by lifting - pushing - rotating - or sliding -W=Fd -F=Amo






19. Mass x acceleration






20. 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






21. A combination of components






22. When the fluid is in motion






23. 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






24. Exhaust of combustion products






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






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






27. 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






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






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






30. Piston travels up and both plugs are closed






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






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






33. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






34. The force simple machines use to do work on a single load or against a single force






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






36. Force x Distance






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






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






39. Body in motion (car)






40. (Force)(Distance)/Seconds






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






42. When the moving fluid is a gas






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






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






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






46. Weight/Time






47. (pi) x (radius)^2






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






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






50. 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 (