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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. Compression-Tension-Shear






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






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






4. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






5. Body in motion (car)






6. 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






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






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






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






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






11. 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.






12. 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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13. (Force)(Distance)/Seconds






14. 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






15. 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






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






17. When the work done by the effort just equals the work done by the load - ______ of the machine will occur






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






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






20. 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






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






22. 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






23. Describes how applied forces bring a body into motion






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






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






26. 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






27. Applied at an angle or parallel to a surface






28. Dimensions and units






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

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30. Force x Distance






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. 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






33. Combustion of fuel mixture ignited by spark plug






34. Rotation will not occur - but translation might occur






35. Exhaust






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






37. ...






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






39. A combination of components






40. Can be applied at a time on an object






41. Compression of fuel mix






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






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






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






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






46. Air is drawn in






47. What we are not studying






48. 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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49. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






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