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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/Area






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






3. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






4. 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 (






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






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






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






8. Combustion of fuel mixture ignited by spark plug






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






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. Air is drawn in






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






13. A combination of components






14. Exhaust of combustion products






15. Compression-Tension-Shear






16. Exhaust






17. (pi) x (radius)^2






18. What we are studying






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






20. 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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21. When the fluid is in motion






22. When fluid is at rest






23. 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)






24. 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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25. 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






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






27. 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






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






29. Liquid or gas






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






31. 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






32. Weight/Time






33. Rotation will not occur - but translation might occur






34. When the moving fluid is a gas






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






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






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






38. ...






39. Can be applied at a time on an object






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






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






42. Describes how applied forces bring a body into motion






43. 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






44. 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






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






46. Combustion ignited by spark plug and materials are compressed






47. 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






48. Force x Distance






49. 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






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