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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. Piston travels up and both plugs are closed






2. 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 (






3. Combustion ignited by spark plug and materials are compressed






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






5. ...






6. Static - Dynamic






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






9. Compression of fuel mix






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






12. 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.






13. Exhaust






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






15. Work/force or vertical distance/sloping distance






16. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






17. When the fluid is in motion






18. One that pushes on an object






19. What we are not studying






20. 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






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






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






23. (Force)(Distance)/Seconds






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






25. The branch of science and engineering involving measurement






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






27. Length x Width






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






29. 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






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






31. 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






32. Force without machine/Force with machine






33. Air is drawn in






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






35. Mass x acceleration






36. When the moving fluid is a gas






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






38. Body in motion (car)






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






40. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






41. External Combustion engine -Only used in factories and plants (not used in cars)






42. 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






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






44. Rotation will not occur - but translation might occur






45. 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






46. 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






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






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






50. Ignition - power stroke