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. 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






2. One that pushes on an object






3. An indication of kinetic energy of mass at the molecular level






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






5. 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






6. Ignition - power stroke






7. What we are studying






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






9. 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






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






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






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






13. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






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






15. 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






16. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






17. 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






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


19. Intake of fuel and air mix






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






21. 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.






22. Mass x acceleration






23. Force without machine/Force with machine






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






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






26. What we are not studying






27. Force x Distance






28. 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






29. Length x Width






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






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






32. Are independent of other dimensions - They are limited in number - length - mass - time - temperature - force






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






34. The branch of science and engineering involving measurement






35. 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






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






37. When fluid is at rest






38. 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






39. Work/force or vertical distance/sloping distance






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






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






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






43. When the moving fluid is a gas






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






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






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






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






48. Body in motion (car)






49. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






50. Can be applied at a time on an object