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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. 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 (






2. Weight/Time






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






4. The magnitude of something in a particular direction






5. A combination of components






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






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

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






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






10. Applied at an angle or parallel to a surface






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






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






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






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






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






16. Force x Distance






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






18. Rotation may occur






19. 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






20. Liquid or gas






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






22. Dimensions and units






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






24. 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






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






26. Intake of fuel and air mix






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






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






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






30. 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






31. Piston travels up and both plugs are closed






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






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






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






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






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






37. Psi - newtons - pascals






38. Length x Width x Height






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






40. 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.






41. 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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42. Same pressure - work - volume - Different forces and distances






43. Exhaust






44. Body in motion (car)






45. Modern Technology- More efficient-Better Cooling-Easier to service- longer life - lither weight- More expensive






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






47. Length / Time






48. 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






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






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