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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. 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.






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






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






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






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






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






7. Ignition - power stroke






8. Length x Width






9. Rotation will not occur - but translation might occur






10. (Force)(Distance)/Seconds






11. Exhaust






12. 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






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






14. Liquid or gas






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






16. Length / Time






17. Exhaust of combustion products






18. Static - Dynamic






19. Body in motion (car)






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






21. 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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22. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






23. What we are studying






24. Combustion ignited by spark plug and materials are compressed






25. Weight/Time






26. When the fluid is in motion






27. Air is drawn in






28. 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






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






30. 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)






31. Movement along a line (reciprocal or linear motion) -Units: feet and meters






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






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






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






35. A combination of components






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






37. Psi - newtons - pascals






38. Force without machine/Force with machine






39. Work/force or vertical distance/sloping distance






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






41. Length x Width x Height






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






43. Rotation may occur






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






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

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46. 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






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






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






49. Piston travels up and both plugs are closed






50. The magnitude of something in a particular direction