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






2. Combustion ignited by spark plug and materials are compressed






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






5. 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 (






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






7. Describes how applied forces bring a body into motion






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






9. ...






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






11. An indication of kinetic energy of mass at the molecular level






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






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






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






15. (Force)(Distance)/Seconds






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






17. What we are not studying






18. Force without machine/Force with machine






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






20. Can be applied at a time on an object






21. 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






22. Length / Time






23. Work/force or vertical distance/sloping distance






24. One that pushes on an object






25. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






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






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






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






29. Force/Area






30. Compression-Tension-Shear






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






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






33. 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






34. Liquid or gas






35. A pull on an object






36. 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






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






38. 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






39. Rotation will not occur - but translation might occur






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

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






42. Ignition - power stroke






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






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






45. When the moving fluid is a gas






46. The designing of machines that contribute to society and our quality of life - Mechanical engineers apply the principles of mathematics - chemistry - and physics to solve real- world problems






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






48. Often a free body has _______ acting on it






49. Combustion of fuel mixture ignited by spark plug






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