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






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






3. 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.






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






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






6. A combination of components






7. 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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8. (pi) x (radius)^2






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






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






11. Rotation will not occur - but translation might occur






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






13. Compression-Tension-Shear






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






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






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






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






18. What we are not studying






19. Combustion ignited by spark plug and materials are compressed






20. When the fluid is in motion






21. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






22. 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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23. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






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






25. 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






26. 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






27. 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 (






28. Length / Time






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






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






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

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32. Length x Width






33. Often a free body has _______ acting on it






34. Psi - newtons - pascals






35. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human






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






37. The branch of science and engineering involving measurement






38. 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






39. Can be applied at a time on an object






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






41. When the moving fluid is a gas






42. 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






43. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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44. 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






45. Exhaust






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






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






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






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






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






Can you answer 50 questions in 15 minutes?



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