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Mechanical Engineering

Subject : engineering
  • Answer 50 questions in 15 minutes.
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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. Describes how applied forces bring a body into motion

2. What we are not studying

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. Length / Time

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

6. 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

7. Combustion of fuel mixture ignited by spark plug

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

9. Force x Distance

10. Mass x acceleration

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

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

13. More compact (size of beer keg) - No valves -Benefits: fewer parts - lower engine weight Problems: seal - lower inertia forces -1 rotar=3 to 4 pistons

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

15. Piston travels up and both plugs are closed

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

17. 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

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

19. Ignition - power stroke

20. When the fluid is in motion

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

22. One that pushes on an object

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

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

25. The magnitude of something in a particular direction

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

27. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2

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

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

30. Force/Area

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

32. Static - Dynamic

33. A combination of components

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

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

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

37. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast

38. Rotation will not occur - but translation might occur

39. 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

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

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

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

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

44. 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

45. The branch of science and engineering involving measurement

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

47. Length x Width

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

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

50. Body in motion (car)