Test your basic knowledge |

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






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






3. Combustion ignited by spark plug and materials are compressed






4. Describes how applied forces bring a body into motion






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






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






7. Can be applied at a time on an object






8. Liquid or gas






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






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






11. An indication of kinetic energy of mass at the molecular level






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






13. 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






14. The branch of science and engineering involving measurement






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






16. 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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17. When fluid is at rest






18. Ignition - power stroke






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






20. 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






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






22. 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.






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






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






25. Force x Distance






26. 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






27. What we are studying






28. A combination of components






29. When the moving fluid is a gas






30. A pull on an object






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






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






33. Exhaust






34. Length / Time






35. Mass x acceleration






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






37. 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






38. Body in motion (car)






39. Rotation will not occur - but translation might occur






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






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






42. 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






43. 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






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






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






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






47. 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






48. Often a free body has _______ acting on it






49. Combustion of fuel mixture ignited by spark plug






50. 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