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






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






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






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






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






7. Mass x acceleration






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






9. 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






10. Rotation may occur






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






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






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






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






15. One that pushes on an object






16. Weight/Time






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






19. Can be applied at a time on an object






20. 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 (






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






22. Psi - newtons - pascals






23. Dimensions and units






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






26. The magnitude of something in a particular direction






27. Length / Time






28. Compression-Tension-Shear






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






31. Ignition - power stroke






32. Liquid or gas






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






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






35. 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.






36. Compression of fuel mix






37. The branch of science and engineering involving measurement






38. 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






39. Often a free body has _______ acting on it






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






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






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






43. 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






44. Intake of fuel and air mix






45. Force x Distance






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






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






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






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






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