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






2. 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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3. Compression-Tension-Shear






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






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






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






7. Force x Distance






8. Length x Width x Height






9. 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






10. 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






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






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

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13. (pi) x (radius)^2






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






15. Force without machine/Force with machine






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






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






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






19. Ignition - power stroke






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






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






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






23. Mass x acceleration






24. 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






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






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






27. The magnitude of something in a particular direction






28. Weight/Time






29. Piston travels up and both plugs are closed






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






31. 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






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






33. 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






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






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






36. (Force)(Distance)/Seconds






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






38. Exhaust of combustion products






39. Piston travels up and exhaust valve opens. Combustion by product exhaustion






40. 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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41. Can be applied at a time on an object






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






43. Often a free body has _______ acting on it






44. 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)






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






46. Exhaust






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






48. Combustion ignited by spark plug and materials are compressed






49. A combination of components






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