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






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






3. When fluid is at rest






4. Ignition - power stroke






5. Rotation may occur






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






7. 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






8. Length x Width






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






10. 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






11. 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






12. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






13. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






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






15. Piston travels up and both plugs are closed






16. 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 (






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






18. 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






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






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






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






22. When the moving fluid is a gas






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






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






26. Combustion ignited by spark plug and materials are compressed






27. Dimensions and units






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






29. Work/force or vertical distance/sloping distance






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






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






32. Weight/Time






33. ...






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






35. Mass x acceleration






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






37. Exhaust






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






39. Intake of fuel and air mix






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






41. 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






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






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






45. Can be applied at a time on an object






46. Body in motion (car)






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






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






49. 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






50. Compression of fuel mix







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