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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. When the fluid is in motion






2. Describes how applied forces bring a body into motion






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






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






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






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






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






10. Intake of fuel and air mix






11. Force/Area






12. The branch of science and engineering involving measurement






13. Mass x acceleration






14. Rotation will not occur - but translation might occur






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

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






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






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






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






20. One that pushes on an object






21. 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






22. A pull on an object






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






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






25. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






26. 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






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






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






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






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






31. 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






32. Length x Width x Height






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






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






35. 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






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






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. 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






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






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






41. 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 (






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






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






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






45. 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






46. What we are not studying






47. Applied at an angle or parallel to a surface






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






49. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






50. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force