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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. 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






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






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






4. Psi - newtons - pascals






5. Mass x acceleration






6. Describes how applied forces bring a body into motion






7. Can be applied at a time on an object






8. When the fluid is in motion






9. Combustion ignited by spark plug and materials are compressed






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






11. Length x Width x Height






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






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






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






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






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






17. 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






18. Often a free body has _______ acting on it






19. Compression of fuel mix






20. 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






21. The branch of science and engineering involving measurement






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






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






24. Force x Distance






25. Compression-Tension-Shear






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






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






28. 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






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






30. 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






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






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






33. ...






34. Weight/Time






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






36. Work/force or vertical distance/sloping distance






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






38. Body in motion (car)






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






40. Three- dimensional property measured in units of length times length times length =length x width x height






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






42. Length / Time






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






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






45. Combustion of fuel mixture ignited by spark plug






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






47. 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






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






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






50. One that pushes on an object