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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. 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






2. Exhaust of combustion products






3. 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






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






5. Psi - newtons - pascals






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

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






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






9. When the moving fluid is a gas






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






11. Static - Dynamic






12. 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






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






14. 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






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






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






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






18. Length x Width






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






20. Combustion of fuel mixture ignited by spark plug






21. (Force)(Distance)/Seconds






22. Force x Distance






23. Rotation will not occur - but translation might occur






24. Work/force or vertical distance/sloping distance






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






26. Exhaust






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






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






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






30. When the fluid is in motion






31. 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






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






33. Combustion ignited by spark plug and materials are compressed






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






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






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






37. The magnitude of something in a particular direction






38. ...






39. 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






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






41. Liquid or gas






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






43. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






44. 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






45. Dimensions and units






46. Force/Area






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






48. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






49. Compression-Tension-Shear






50. Length / Time