Test your basic knowledge |

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. 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


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






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






4. Weight/Time






5. Translation (slide) -Rotate -Slide and Rotate Together






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






7. What we are not studying






8. ...






9. Force x Distance






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






11. Compression of fuel mix






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






13. When the work done by the effort exceeds the work done by the load - the load...






14. A combination of components






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






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






17. Body in motion (car)






18. 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






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






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






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






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






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






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






25. Ignition - power stroke






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






27. Combustion ignited by spark plug and materials are compressed






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






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






30. When the moving fluid is a gas






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






32. 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






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






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






35. Compression-Tension-Shear






36. Mass x acceleration






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






38. 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






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






40. Intake of fuel and air mix






41. (Force)(Distance)/Seconds






42. A^2+b^2=c^2






43. What we are studying






44. Rotation will not occur - but translation might occur






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






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






47. 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






48. Air is drawn in






49. Length x Width






50. When fluid is at rest