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

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2. 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.






3. Length x Width






4. Rotation will not occur - but translation might occur






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






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






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






8. 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 (






9. One that pushes on an object






10. Same pressure - work - volume - Different forces and distances






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






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






13. What we are studying






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






15. Often a free body has _______ acting on it






16. Dimensions and units






17. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline






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






19. Psi - newtons - pascals






20. Applied at an angle or parallel to a surface






21. (Force)(Distance)/Seconds






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






23. Combustion ignited by spark plug and materials are compressed






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






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






26. Air is drawn in






27. Exhaust






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






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






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






31. Describes how applied forces bring a body into motion






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






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






34. 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






35. A pull on an object






36. 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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37. 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






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






39. 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






40. Combustion of fuel mixture ignited by spark plug






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






42. Static - Dynamic






43. 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






44. The branch of science and engineering involving measurement






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






46. 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)






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






48. Work/force or vertical distance/sloping distance






49. 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






50. 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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