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






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






4. Length x Width






5. 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






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






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






8. Exhaust of combustion products






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






10. The branch of science and engineering involving measurement






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






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






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






14. 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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15. Work/force or vertical distance/sloping distance






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






17. What we are not studying






18. 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






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






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






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






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






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






25. Compression of fuel mix






26. 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






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






28. Force x Distance






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






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






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






32. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






33. When the fluid is in motion






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






35. What we are studying






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






37. 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






38. 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.






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






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






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






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






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






45. Force/Area






46. 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






47. (Force)(Distance)/Seconds






48. Psi - newtons - pascals






49. (pi) x (radius)^2






50. Exhaust