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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. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






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






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






4. When the fluid is in motion






5. (pi) x (radius)^2






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






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






8. Force x Distance






9. Fuel is injected and combusts due to temperature of compressed air






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






11. Work/force or vertical distance/sloping distance






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






13. Weight/Time






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






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






16. Rotation will not occur - but translation might occur






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






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






19. One that pushes on an object






20. Compression of fuel mix






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






22. 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 (






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






24. Psi - newtons - pascals






25. Can be applied at a time on an object






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






27. A combination of components






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






29. Mass x acceleration






30. What we are not studying






31. 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






32. Piston travels up and both plugs are closed






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






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






36. 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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37. Force/Area






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






39. 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






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






41. Rotation may occur






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






43. Exhaust of combustion products






44. Length x Width






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






46. 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.






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






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






49. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






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