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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. 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






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






3. Length x Width x Height






4. Combine two or more power sources - locomotives - buses (diesel- electric) -Submarines (Nuclear- electric) -Components:gas engine - fuel tank - electric motor - generator - batteries - transmission -2 motors: Internal Combustion Engine and Electric E






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. 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)






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






8. Exhaust






9. Body in motion (car)






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






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






12. 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






13. A system adopted from an old British system of units in the 13th century -Engineering system -Units: length- foot (ft) - time- second (s) - force-(lbs) - Mass is a derived unit called a slug -Political/Economic choice -Awkward






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






15. Rotation may occur






16. 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






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






18. Weight/Time






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






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






21. Work/force or vertical distance/sloping distance






22. 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






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






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






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






26. When fluid is at rest






27. 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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28. Mass x acceleration






29. Length / Time






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






31. Dimensions and units






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






33. (pi) x (radius)^2






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






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






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






37. Describes how applied forces bring a body into motion






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






39. Rotation will not occur - but translation might occur






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






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






42. A combination of components






43. The branch of science and engineering involving measurement






44. When the moving fluid is a gas






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






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






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






48. Often a free body has _______ acting on it






49. A pull on an object






50. ICE generates electricity for electric battery -Electric motor turns wheels







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