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






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






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






4. Ignition - power stroke






5. Often a free body has _______ acting on it






6. When the fluid is in motion






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






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






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






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






11. Psi - newtons - pascals






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






13. Force without machine/Force with machine






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






15. What we are not studying






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






17. Compression of fuel mix






18. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us


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






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






21. The magnitude of something in a particular direction






22. What we are studying






23. 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






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






25. 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






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






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






28. 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






29. 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)






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






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






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






33. Weight/Time






34. Combustion of fuel mixture ignited by spark plug






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


36. When fluid is at rest






37. Work/force or vertical distance/sloping distance






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






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






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






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






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






43. Body in motion (car)






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






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






46. Static - Dynamic






47. Liquid or gas






48. Exhaust






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






50. 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