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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. Length x Width






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






3. A pull on an object






4. When the moving fluid is a gas






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






6. Force/Area






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






8. Rotation will not occur - but translation might occur






9. 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






10. Compression of fuel mix






11. Psi - newtons - pascals






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






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






14. Work/force or vertical distance/sloping distance






15. 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






16. Combustion of fuel mixture ignited by spark plug






17. 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






18. 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






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






20. 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






21. 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






22. 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

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






24. 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






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






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






27. 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






28. Both engines drive wheels -ICE used for cruising -Electric motor assists with low speed for acceleration and hill climbing






29. Piston travels up and both plugs are closed






30. Combustion ignited by spark plug and materials are compressed






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






32. (pi) x (radius)^2






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






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






35. When fluid is at rest






36. Can be applied at a time on an object






37. 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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38. Length / Time






39. ICE generates electricity for electric battery -Electric motor turns wheels






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






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






42. 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.






43. Weight/Time






44. Ignition - power stroke






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






46. When the fluid is in motion






47. ...






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






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






50. 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