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






3. 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






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






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






6. 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






7. Mass x acceleration






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






9. One that pushes on an object






10. A pull on an object






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






12. Combustion ignited by spark plug and materials are compressed






13. A combination of components






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






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






16. 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






17. 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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18. Can be applied at a time on an object






19. Dimensions and units






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. 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 (






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






23. Often a free body has _______ acting on it






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






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






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






27. Length / Time






28. When fluid is at rest






29. Applied at an angle or parallel to a surface






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






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






32. Length x Width x Height






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






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






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






36. 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






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






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






39. 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






40. Intake of fuel and air mix






41. What we are studying






42. Static - Dynamic






43. Psi - newtons - pascals






44. ...






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






46. Air is drawn in






47. Piston travels up and both plugs are closed






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






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






50. Compression-Tension-Shear