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






3. Exhaust






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






5. 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






6. 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






7. Often a free body has _______ acting on it






8. 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






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






10. Exhaust of combustion products






11. 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






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






13. When the fluid is in motion






14. The magnitude of something in a particular direction






15. Psi - newtons - pascals






16. Compression of fuel mix






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






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






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






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






21. 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






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






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






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






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






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






27. In a hydraulic with an incompressible fluid - the total pressure at any point in the system is the same - liquid

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28. Combustion of fuel mixture ignited by spark plug






29. Combustion ignited by spark plug and materials are compressed






30. Applied at an angle or parallel to a surface






31. Work/force or vertical distance/sloping distance






32. Length / Time






33. Intake of fuel and air mix






34. What we are not studying






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






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






37. Rotation will not occur - but translation might occur






38. Dimensions and units






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






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






41. 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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42. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






43. 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






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






45. Force/Area






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






47. A pull on an object






48. 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






49. A combination of components






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







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