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






2. 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






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






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






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






7. Exhaust of combustion products






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






9. 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






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






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






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






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






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






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






17. Piston travels up and both plugs are closed






18. One that pushes on an object






19. Force without machine/Force with machine






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






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






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






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






24. 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.






25. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






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






27. Compression of fuel mix






28. Length x Width x Height






29. 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






30. Combustion ignited by spark plug and materials are compressed






31. What we are studying






32. Intake of fuel and air mix






33. 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






34. 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






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






36. Exhaust






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






38. Applied at an angle or parallel to a surface






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






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






41. Force/Area






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






43. What we are not studying






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






45. Length / Time






46. Ignition - power stroke






47. 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






48. Body in motion (car)






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






50. A combination of components







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