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






2. (Force)(Distance)/Seconds






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






4. Force without machine/Force with machine






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






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






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






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






9. Rotation may occur






10. Force and mass are proportional to each other (F=ma) -If F increases - so does acceleration -Force causes acceleration - More force means more acceleration - same mass - More mass means less acceleration - same force

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






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






13. What we are studying






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






15. Exhaust of combustion products






16. Exhaust






17. Work/force or vertical distance/sloping distance






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






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






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

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21. When the moving fluid is a gas






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






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






24. 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)






25. 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






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






27. 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






28. When fluid is at rest






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






30. 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






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






32. 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 (






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






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






35. 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






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






37. 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






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






39. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






40. Psi - newtons - pascals






41. Combustion of fuel mixture ignited by spark plug






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






43. Ignition - power stroke






44. 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






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






46. Length x Width x Height






47. A combination of components






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






49. 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






50. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E