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 x Width






2. Dimensions and units






3. 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






4. 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






5. ...






6. 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






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






8. 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






9. When the moving fluid is a gas






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


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






12. Length / Time






13. Describes how applied forces bring a body into motion






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






15. Psi - newtons - pascals






16. 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






17. 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






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






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






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






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






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






23. The magnitude of something in a particular direction






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






25. Ignition - power stroke






26. 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.






27. Often a free body has _______ acting on it






28. 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






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






30. Weight/Time






31. Rotation may occur






32. (pi) x (radius)^2






33. Compression-Tension-Shear






34. What we are not studying






35. Work/force or vertical distance/sloping distance






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






37. 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






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






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






40. One that pushes on an object






41. When fluid is at rest






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






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






44. Rotation will not occur - but translation might occur






45. 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


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






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






48. Exhaust






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






50. Combustion ignited by spark plug and materials are compressed