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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. Air is drawn in






2. When the work done by the effort exceeds the work done by the load - the load...






3. In a right triangle - the sum of the squares of the sides equals the square of the hypotenous






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






5. The magnitude of something in a particular direction






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






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






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






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






10. A flat - sloping surface -The only simple machine that does not move -The force is applied to the ramp - since this is the direction the load weight is moved -Sloping side is longer than vertical side -Less force is required to accomplish the same am






11. Ignition - power stroke






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






13. Force x Distance






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






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






16. Compression of fuel mix






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






18. 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






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






20. 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.






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






22. Exhaust of combustion products






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






24. Intake of fuel and air mix






25. Work/force or vertical distance/sloping distance






26. (pi) x (radius)^2






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






28. Psi - newtons - pascals






29. 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






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

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






32. 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






33. Applied at an angle or parallel to a surface






34. 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






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






36. Dimensions and units






37. When fluid is at rest






38. Weight/Time






39. One that pushes on an object






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






41. Piston travels up and both plugs are closed






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






43. The branch of science and engineering involving measurement






44. Static - Dynamic






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






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






47. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






48. (Force)(Distance)/Seconds






49. 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






50. 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