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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. Dimensions and units






2. 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






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






4. 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.






5. 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






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






7. 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






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. Length / Time






10. 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 (






11. Weight/Time






12. 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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13. (Force)(Distance)/Seconds






14. Often a free body has _______ acting on it






15. A pull on an object






16. When the fluid is in motion






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






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






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






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






21. Piston travels up and both plugs are closed






22. 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






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






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






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






26. Length x Width






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






28. Exhaust






29. Describes how applied forces bring a body into motion






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






31. Combustion ignited by spark plug and materials are compressed






32. Compression-Tension-Shear






33. Force/Area






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






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

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






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






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






39. Applied at an angle or parallel to a surface






40. When fluid is at rest






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






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






43. Force x Distance






44. Rotation will not occur - but translation might occur






45. Air is drawn in






46. 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






47. 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






48. 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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49. Intake of fuel and air mixture - compression of mixture by piston






50. When the work done by the effort exceeds the work done by the load - the load...