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






2. Compression of fuel mix






3. A pull on an object






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






5. Varies by location (on earth) - distance (from earth) - and mass (of planet)






6. Applied at an angle or parallel to a surface






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






8. 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






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






10. Air is drawn in






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






12. Force x Distance






13. Can be applied at a time on an object






14. 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 (






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






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






17. 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






18. Often a free body has _______ acting on it






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






20. 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






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






22. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






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






24. 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)






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






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






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






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






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






30. The branch of science and engineering involving measurement






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






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






33. (pi) x (radius)^2






34. 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






35. 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






36. The magnitude of something in a particular direction






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






38. Rotation will not occur - but translation might occur






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






40. Weight/Time






41. 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






42. One that pushes on an object






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






44. 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






45. ...






46. Mass x acceleration






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






48. Intake of fuel and air mix






49. What we are not studying






50. Length / Time