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Mechanical Engineering

Subject : engineering
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Often a free body has _______ acting on it

2. Dimensions and units

3. A combination of components

4. Body in motion (car)

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

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

7. (pi) x (radius)^2

8. When the moving fluid is a gas

9. Rotation will not occur - but translation might occur

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

11. 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

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

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

14. 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

15. One that pushes on an object

16. Exhaust

17. Compression-Tension-Shear

18. Work/force or vertical distance/sloping distance

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

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

21. 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

22. Force without machine/Force with machine

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

24. Four Stroke Engine -Used in hotter areas because more efficient -Higher compression ratio than gasoline

25. Piston travels up and both plugs are closed

26. Liquid or gas

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

28. A pull on an object

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

30. Length / Time

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

32. When fluid is at rest

33. Air is drawn in

34. The magnitude of something in a particular direction

35. What we are studying

36. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

37. 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

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

39. Mass x acceleration

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

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

42. Two stroke- Four Stroke- Diesel-Rotary -Hybrid

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

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

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

46. 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

47. Length x Width

48. 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

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

50. 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)