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. 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






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






4. 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






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






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






7. Length x Width x Height






8. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






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






10. 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






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






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






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






14. Can be applied at a time on an object






15. Ignition - power stroke






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






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






18. 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






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






20. 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






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






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






23. ...






24. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us


25. Dimensions and units






26. Exhaust of combustion products






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






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






29. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs






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






31. 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.






32. The magnitude of something in a particular direction






33. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






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






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






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






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






38. The branch of science and engineering involving measurement






39. Rotation will not occur - but translation might occur






40. Intake of fuel and air mix






41. Often a free body has _______ acting on it






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






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






44. When the moving fluid is a gas






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






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






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






48. Mass x acceleration






49. Compression of fuel mix






50. Piston travels up and both plugs are closed