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






2. Liquid or gas






3. Force without machine/Force with machine






4. When the moving fluid is a gas






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






6. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






7. (Force)(Distance)/Seconds






8. Applied at an angle or parallel to a surface






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






11. Can be applied at a time on an object






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






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






14. 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






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






17. Body in motion (car)






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






19. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






20. Length / Time






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






22. 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






23. 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






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






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






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






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






28. Mass x acceleration






29. (pi) x (radius)^2






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






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






32. One that pushes on an object






33. What we are studying






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






35. 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






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






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






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






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






40. 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






41. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






42. Rotation may occur






43. 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






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






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






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






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






48. 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)






49. 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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50. 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







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Can you answer 50 questions in 15 minutes?


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