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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. A combination of components






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






3. When fluid is at rest






4. 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






5. 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.






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






7. Body in motion (car)






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






9. 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






10. Often a free body has _______ acting on it






11. 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






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






13. 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






14. Length / Time






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

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






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






18. Intake of fuel and air mix






19. Rotation may occur






20. 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 (






21. 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






22. Air is drawn in






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






24. Liquid or gas






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






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






27. Dimensions and units






28. Work/force or vertical distance/sloping distance






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






30. When the moving fluid is a gas






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






32. 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)






33. Mass x acceleration






34. 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






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






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






37. Length x Width x Height






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






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






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






41. The magnitude of something in a particular direction






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






43. A pull on an object






44. Can be applied at a time on an object






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






46. Same pressure - work - volume - Different forces and distances






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






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






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