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

2. Applied at an angle or parallel to a surface

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

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

5. Mass x acceleration

6. 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 (

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

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

9. 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

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

11. 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

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

13. Describes how applied forces bring a body into motion

14. A pull on an object

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

16. ...

17. Combustion of fuel mixture ignited by spark plug

18. 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

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

20. The branch of science and engineering involving measurement

21. Length x Width x Height

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

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

24. Force x Distance

25. Air is drawn in

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

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

28. Force and mass are proportional to each other (F=ma) -If F increases - so does acceleration -Force causes acceleration - More force means more acceleration - same mass - More mass means less acceleration - same force

29. 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

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

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

32. A combination of components

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

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

35. Weight/Time

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

37. Combustion ignited by spark plug and materials are compressed

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

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

40. Psi - newtons - pascals

41. Can be applied at a time on an object

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

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

44. 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

45. Compression-Tension-Shear

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

47. When the moving fluid is a gas

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

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