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. Length / Time






2. 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






3. 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)






4. Rotation may occur






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






6. 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






7. 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






8. What we are not studying






9. 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






10. What we are studying






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






12. Static - Dynamic






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






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

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15. Air is drawn in






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






17. Ignition - power stroke






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






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






22. Length x Width






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






24. 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






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






27. Psi - newtons - pascals






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






29. Can be applied at a time on an object






30. Length x Width x Height






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






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






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






34. Exhaust






35. 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






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






37. Describes how applied forces bring a body into motion






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






39. 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






40. When fluid is at rest






41. Compression of fuel mix






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






43. When the moving fluid is a gas






44. A pull on an object






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






46. Often a free body has _______ acting on it






47. Body at rest or is in equilibrium (wall)






48. 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.






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






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