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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. Often a free body has _______ acting on it






2. Intake of fuel and air mix






3. The magnitude of something in a particular direction






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






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






6. Static - Dynamic






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






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






9. A pull on an object






10. Mass x acceleration






11. Combustion of fuel mixture ignited by spark plug






12. What we are studying






13. Body in motion (car)






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






15. Length x Width x Height






16. A combination of components






17. One that pushes on an object






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






19. Psi - newtons - pascals






20. Describes how applied forces bring a body into motion






21. 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






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






23. When the fluid is in motion






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






25. Combustion ignited by spark plug and materials are compressed






26. 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






27. 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






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






29. 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






30. Rotation will not occur - but translation might occur






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






32. 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






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






34. Piston travels up and both plugs are closed






35. Force without machine/Force with machine






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






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






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






39. 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)






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






41. What we are not studying






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






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






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






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






48. Compression of fuel mix






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






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







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