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






2. 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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3. 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






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






5. Exhaust of combustion products






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






7. Weight/Time






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






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






10. Static - Dynamic






11. What we are not studying






12. Piston travels up and both plugs are closed






13. Applied at an angle or parallel to a surface






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






15. Describes how applied forces bring a body into motion






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






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






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






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






20. 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






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






22. Length x Width x Height






23. Length / Time






24. What we are studying






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






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






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






28. Body in motion (car)






29. 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






30. When fluid is at rest






31. (pi) x (radius)^2






32. Can be reduced by decreasing the weight or force or increasing the area i.e. airbag






33. A combination of components






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






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






36. Mass x acceleration






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






38. (Force)(Distance)/Seconds






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

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40. ...






41. Body at rest or is in equilibrium (wall)






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






43. 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






44. 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






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






46. Combustion of fuel mixture ignited by spark plug






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






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






49. Work/force or vertical distance/sloping distance






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