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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. Air is drawn in






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






3. A pull on an object






4. 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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5. 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.






6. Varies by location (on earth) - distance (from earth) - and mass (of planet)






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






8. The magnitude of something in a particular direction






9. Piston travels up and both plugs are closed






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






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

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






13. Combustion ignited by spark plug and materials are compressed






14. Length x Width x Height






15. 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






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






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






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






19. 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






20. Applied at an angle or parallel to a surface






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






22. Force without machine/Force with machine






23. 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






24. 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






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






26. Weight/Time






27. When the fluid is in motion






28. Fuel is injected and combusts due to temperature of compressed air






29. (pi) x (radius)^2






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






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






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






33. 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






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






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






36. 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






37. 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






38. 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






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






40. ...






41. 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






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






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






44. Body in motion (car)






45. Length / Time






46. When fluid is at rest






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






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






49. Compression of fuel mix






50. Work/force or vertical distance/sloping distance