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. Combustion of fuel mixture ignited by spark plug






2. 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






3. Rotation will not occur - but translation might occur






4. Applied at an angle or parallel to a surface






5. Length / Time






6. Weight/Time






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






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






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






10. A pull on an object






11. What we are not studying






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






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






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






15. 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






16. 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






17. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion






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






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






20. 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.






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






22. Liquid or gas






23. When the moving fluid is a gas






24. Combustion ignited by spark plug and materials are compressed






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






26. Air is drawn in






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






28. 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






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






30. Force without machine/Force with machine






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






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






33. The magnitude of something in a particular direction






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






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






36. Exhaust of combustion products






37. 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






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






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






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






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






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






43. When the sum of all forces and the sum of all moments both equal forces - No movement






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






45. 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






46. 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






47. Can be applied at a time on an object






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






49. Work/force or vertical distance/sloping distance






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