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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. 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






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






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






4. Describes how applied forces bring a body into motion






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






7. 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






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






9. Mass can neither by created nor destroyed - only transformed






10. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






11. Work/force or vertical distance/sloping distance






12. Compression-Tension-Shear






13. (pi) x (radius)^2






14. Length x Width x Height






15. 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






16. Body in motion (car)






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






18. Mass x acceleration






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






20. Compression of fuel mix






21. Force x Distance






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






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






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






25. When fluid is at rest






26. The branch of science and engineering involving measurement






27. Ignition - power stroke






28. Can be applied at a time on an object






29. A pull on an object






30. (Force)(Distance)/Seconds






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






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






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






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






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






36. 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






37. Applied at an angle or parallel to a surface






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






39. 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.






40. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components






41. Piston travels up and both plugs are closed






42. 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






43. Combustion of fuel mixture ignited by spark plug






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






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






46. What we are not studying






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






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






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






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