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






2. Describes how applied forces bring a body into motion






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






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






5. When the moving fluid is a gas






6. Applied at an angle or parallel to a surface






7. Force/Area






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






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






10. 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






11. Ignition - power stroke






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






13. Weight/Time






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






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






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






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






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

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20. ...






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






22. 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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23. 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.






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






25. Length x Width x Height






26. 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






27. When fluid is at rest






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. 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






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






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






33. Mechanics is an application of math that describes how forces affect a body






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






35. Rotation will not occur - but translation might occur






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






37. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






38. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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39. Work/force or vertical distance/sloping distance






40. Exhaust of combustion products






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






42. 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






43. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






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






45. 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)






46. Static - Dynamic






47. Rotation may occur






48. 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






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






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







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Can you answer 50 questions in 15 minutes?


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