Test your basic knowledge |

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






2. Compression-Tension-Shear






3. Often a free body has _______ acting on it






4. One that pushes on an object






5. Air is drawn in






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






7. 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






8. Force x Distance






9. A pull on an object






10. 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






11. Weight/Time






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






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






14. Piston travels up and both plugs are closed






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






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






17. Length x Width x Height






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






19. Can be applied at a time on an object






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






21. 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






22. 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






23. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






24. 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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25. Rotation will not occur - but translation might occur






26. 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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27. Intake of fuel and air mixture - compression of mixture by piston






28. Exhaust of combustion products






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






30. The magnitude of something in a particular direction






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






32. 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






33. (Force)(Distance)/Seconds






34. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






35. 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






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






38. Ignition - power stroke






39. Describes how applied forces bring a body into motion






40. 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






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






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






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






44. Applied at an angle or parallel to a surface






45. (pi) x (radius)^2






46. ...






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






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






49. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






50. When the fluid is in motion