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. When the moving fluid is a gas






2. Static - Dynamic






3. 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






4. What we are studying






5. 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






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






7. Piston travels up and both plugs are closed






8. Rotation will not occur - but translation might occur






9. (pi) x (radius)^2






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






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






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






13. 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






14. Rotation may occur






15. When the fluid is in motion






16. Combustion of fuel mixture ignited by spark plug






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






18. Often a free body has _______ acting on it






19. Compression-Tension-Shear






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






21. When fluid is at rest






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






23. The magnitude of something in a particular direction






24. Length x Width






25. Air is drawn in






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






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






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






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






30. Mass can neither by created nor destroyed - only transformed






31. Psi - newtons - pascals






32. 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


33. Exhaust






34. Can be applied at a time on an object






35. 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






36. 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






37. Work/force or vertical distance/sloping distance






38. 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 (






39. Ignition - power stroke






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






41. 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)






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






43. A pull on an object






44. One that pushes on an object






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






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






48. 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


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






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