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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. Static - Dynamic






2. Liquid or gas






3. Rotation will not occur - but translation might occur






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






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






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






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






9. 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






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






11. Exhaust






12. Piston travels up and both plugs are closed






13. Length x Width x Height






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. When the moving fluid is a gas






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






17. 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)






18. Applied at an angle or parallel to a surface






19. Mass x acceleration






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. Psi - newtons - pascals






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






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






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






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






27. 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.






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






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






30. Piston travels down and intake valve is opened. Intake of fuel and air into chamber






31. Describes how applied forces bring a body into motion






32. Describes a physical property of anything - What we are measuring






33. Rotation may occur






34. Work/force or vertical distance/sloping distance






35. Length x Width






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






37. Force x Distance






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






39. Often a free body has _______ acting on it






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






41. Force/Area






42. 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






43. Length / Time






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






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






46. Weight/Time






47. 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






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






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