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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 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






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






3. Weight/Time






4. Exhaust






5. Length / Time






6. 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






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






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






9. Dimensions and units






10. 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






11. ...






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






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






14. Same pressure - work - volume - Different forces and distances






15. Compression of fuel mix






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






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






19. When the moving fluid is a gas






20. Ignition - power stroke






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






22. Intake of fuel and air mix






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






24. ICE generates electricity for electric battery -Electric motor turns wheels






25. Psi - newtons - pascals






26. Length x Width x Height






27. Describes a physical property of anything - What we are measuring






28. 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






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






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






31. Force without machine/Force with machine






32. 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






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






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






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






36. Allows comparison between different measuring systems and units - Necessary to market internationally






37. The branch of science and engineering involving measurement






38. Length x Width






39. 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






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






41. 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






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






43. A pull on an object






44. Force/Area






45. Body in motion (car)






46. 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)






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






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






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






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







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