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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. Length / Time






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






3. Mass x acceleration






4. When the moving fluid is a gas






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






6. Dimensions and units






7. 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






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






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






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






11. Compression-Tension-Shear






12. A pull on an object






13. 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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14. Piston travels up and both plugs are closed






15. Psi - newtons - pascals






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






17. Exhaust of combustion products






18. 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 (






19. 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






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






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






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






23. Air is drawn in






24. Liquid or gas






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






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






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






28. Force without machine/Force with machine






29. Compression of fuel mix






30. Weight/Time






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






32. (pi) x (radius)^2






33. ...






34. One that pushes on an object






35. (Force)(Distance)/Seconds






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






37. Often a free body has _______ acting on it






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






39. Length x Width x Height






40. Body in motion (car)






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






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






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






44. 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






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






46. 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






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






48. 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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49. Translation (slide) -Rotate -Slide and Rotate Together






50. The magnitude of something in a particular direction