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. 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






2. When the fluid is in motion






3. 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






4. ...






5. 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






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






7. (pi) x (radius)^2






8. Piston travels up and both plugs are closed






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






10. Psi - newtons - pascals






11. 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






12. 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






13. Compression-Tension-Shear






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






15. 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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


16. A combination of components






17. Dimensions and units






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






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






20. 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






21. 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)






22. Intake of fuel and air mix






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






24. 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






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






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






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






28. Exhaust of combustion products






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






30. Body in motion (car)






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






32. Rotation may occur






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






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






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






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






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






39. Often a free body has _______ acting on it






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


41. Air is drawn in






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






43. Work/force or vertical distance/sloping distance






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






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






46. 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






47. Describes how applied forces bring a body into motion






48. Describes how applied forces bring a body into rest or equilibrium






49. When the moving fluid is a gas






50. 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.