## Test your basic knowledge |

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

**2. Dimensions and units**

**3. When the moving fluid is a gas**

**4. Liquid or gas**

**5. Length x Width**

**6. A pull on an object**

**7. 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 (**

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

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

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

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

**12. When the fluid is in motion**

**13. The magnitude of something in a particular direction**

**14. Body in motion (car)**

**15. Length / Time**

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

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

**18. 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**

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

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

**21. Can be applied at a time on an object**

**22. Static - Dynamic**

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

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

**25. Compression-Tension-Shear**

**26. 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**

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

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

**29. Intake of fuel and air mixture - compression of mixture by piston**

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

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

**32. 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**

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

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

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

**36. Body at rest or is in equilibrium (wall)**

**37. Piston travels up and both plugs are closed**

**38. 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**

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

**40. 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**

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

**42. Psi - newtons - pascals**

**43. Force/Area**

**44. (Force)(Distance)/Seconds**

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

**46. What we are studying**

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

**48. ...**

**49. Mass x acceleration**

**50. Exhaust**