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






2. Piston travels up and both plugs are closed






3. 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






4. Exhaust






5. What we are not studying






6. When fluid is at rest






7. 1. Magnitude: size - a numberi.e. 50 mph 2. Direction: angle i.e. N -E -W -S






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






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






10. 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






11. A combination of components






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






13. Dimensions and units






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






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






16. Force without machine/Force with machine






17. A pull on an object






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






19. 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






20. The branch of science and engineering involving measurement






21. 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






22. Used in cars -2 rotations of crankshaft -4 strokes (down - up - down - up) of piston - i.e. cars - trucks - planes - buses - motorcycles - submarine -1% of gas actually moves people






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






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






25. Fuel is injected and combusts due to temperature of compressed air






26. 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 (






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






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






29. Same pressure - work - volume - Different forces and distances






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






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






32. Tells us how fast work is done - varies with time (more power is needed to do work in less time - and less power is needed to do work in more time) =Fd/s -Units: USA: ft- lb/s SI: watts (J/S)






33. One that pushes on an object






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

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






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






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






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






39. Air is drawn in






40. 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






41. 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






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






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






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






45. 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






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






47. Length x Width x Height






48. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






49. Compression of fuel mix






50. 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