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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. Rotation may occur






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






3. Combustion of fuel mixture ignited by spark plug






4. Combustion ignited by spark plug and materials are compressed






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






6. Applied at an angle or parallel to a surface






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






8. Air is drawn in






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






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






11. 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






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






13. Piston travels up and both plugs are closed






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






15. Translation (slide) -Rotate -Slide and Rotate Together






16. 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)






17. Describes how applied forces bring a body into motion






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






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






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






21. Exhaust of combustion products






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






23. 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






24. Length x Width






25. Length / Time






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






27. ...






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






29. Intake of fuel and air mix






30. Compression of fuel mix






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






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






33. 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






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






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






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






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






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






40. Static - Dynamic






41. (Force)(Distance)/Seconds






42. Force x Distance






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






44. 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






45. Body in motion (car)






46. 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






47. 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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48. 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






49. Length x Width x Height






50. Exhaust






Can you answer 50 questions in 15 minutes?



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