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






2. 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






3. When the fluid is in motion






4. (Force)(Distance)/Seconds






5. The magnitude of something in a particular direction






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






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






8. 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






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






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






11. Combustion ignited by spark plug and materials are compressed






12. (pi) x (radius)^2






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






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






15. Combustion of fuel mixture ignited by spark plug






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






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

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18. Dimensions and units






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






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






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






22. 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






23. 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






24. Force x Distance






25. Weight/Time






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






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






28. Mass x acceleration






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






30. Liquid or gas






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






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






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






34. 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






35. 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






36. Psi - newtons - pascals






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






38. 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






39. Describes how applied forces bring a body into rest or equilibrium






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






41. 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






42. Exhaust of combustion products






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






44. The standard system of units that uses base 10 and used in the rest of the world. US does not use - but Great Britain does - Base Units: mass - kilograms (kg) - length- meters (m) - and time-Seconds (S) - Force is a derived unit measured in newtons (






45. 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






46. Body in motion (car)






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






48. A pull on an object






49. Applied at an angle or parallel to a surface






50. 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.