Test your basic knowledge |

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






2. Exhaust of combustion products






3. Length x Width






4. Mechanics is an application of math that describes how forces affect a body






5. 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






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






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






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






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






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






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






12. 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






13. 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.






14. What we are not studying






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






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






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






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






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






20. Ignition - power stroke






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






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






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






24. (pi) x (radius)^2






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






26. A pull on an object






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






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






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. Liquid or gas






31. When the moving fluid is a gas






32. One that pushes on an object






33. 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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34. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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






36. What we are studying






37. 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






38. The magnitude of something in a particular direction






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






40. Applied at an angle or parallel to a surface






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






42. Weight/Time






43. Static - Dynamic






44. (Force)(Distance)/Seconds






45. Force without machine/Force with machine






46. Combustion ignited by spark plug and materials are compressed






47. ...






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






49. 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






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