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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. 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)






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






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






4. 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






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






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






7. The magnitude of something in a particular direction






8. Body in motion (car)






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






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






11. 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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12. 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






13. When fluid is at rest






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






15. 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






16. 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






17. 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






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






19. What we are not studying






20. The branch of science and engineering involving measurement






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






22. Piston travels up and both plugs are closed






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






24. Rotation may occur






25. Translation (slide) -Rotate -Slide and Rotate Together






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






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






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






29. 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 (






30. Combustion ignited by spark plug and materials are compressed






31. 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






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






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






34. 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






35. Length / Time






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






37. When the moving fluid is a gas






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






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






40. Psi - newtons - pascals






41. When the work done by the effort exceeds the work done by the load - the load...






42. Rotation will not occur - but translation might occur






43. Ignition - power stroke






44. Liquid or gas






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






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






47. 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






48. 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






49. 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






50. (pi) x (radius)^2