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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. (pi) x (radius)^2






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






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






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






5. When the moving fluid is a gas






6. Exhaust of combustion products






7. What we are studying






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






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






10. Exhaust






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






12. Describes a physical property of anything - What we are measuring






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






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






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






16. Force x Distance






17. Combustion of fuel mixture ignited by spark plug






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






19. Combustion ignited by spark plug and materials are compressed






20. Mass x acceleration






21. Can be applied at a time on an object






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






23. 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






24. 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






25. 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






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






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






28. Length / Time






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






31. 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






32. Ignition - power stroke






33. 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






34. Length x Width






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






36. 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






37. Length x Width x Height






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






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






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






41. (Force)(Distance)/Seconds






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






43. Static - Dynamic






44. 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






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






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






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. 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.






49. A pull on an object






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

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