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






2. Work/force or vertical distance/sloping distance






3. 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






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






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






6. A pull on an object






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






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






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






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






11. 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






12. Ignition - power stroke






13. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






14. One that pushes on an object






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






16. Static - Dynamic






17. Rotation will not occur - but translation might occur






18. Force x Distance






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






20. 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






21. (pi) x (radius)^2






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






23. 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






24. A combination of components






25. Combustion of fuel mixture ignited by spark plug






26. 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






27. The magnitude of something in a particular direction






28. Describes how applied forces bring a body into motion






29. Intake of fuel and air mix






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






31. 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






32. Length / Time






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






34. 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)






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






37. Weight/Time






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






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






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






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






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






43. 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






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






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






46. 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.






47. Compression-Tension-Shear






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






49. Force/Area






50. (Force)(Distance)/Seconds