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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. Intake of fuel and air mix






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






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






4. Mass x acceleration






5. Static - Dynamic






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






7. Rotation will not occur - but translation might occur






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






9. 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






10. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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






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






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






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






15. 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






16. 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






17. Length x Width






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






19. A pull on an object






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






21. (Force)(Distance)/Seconds






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






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






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






25. 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






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






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






28. Body at rest or is in equilibrium (wall)






29. When fluid is at rest






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






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






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






33. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing






34. Rotation may occur






35. Combustion ignited by spark plug and materials are compressed






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






37. 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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38. Air is compressed - work is done on the system






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

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40. 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






41. Brake pedal and linkage - Master Cylinder - Wheel cylinders (4) - Hydraulic lines - Hydraulic fluid - Mechanical advantage is provided by the foot pedal to the booster (level) - A greater force is applied on the wheel cylinders than on the brake peda






42. Can be applied at a time on an object






43. 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)






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






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






46. 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






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






48. Ignition - power stroke






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






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