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. Exhaust of combustion products






2. Weight/Time






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






4. Static - Dynamic






5. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






6. A pull on an object






7. 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

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






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






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






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






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






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






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

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15. Pistons connected to crankshaft -1 stroke up - 1 stroke down of the piston -1 rotation of the piston -Problems: high emissions - noisy - inefficient - high vibrations - unburnt fuel - burnt oil -Benefits: small and light -Being phased out in USA - i.






16. 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






17. 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






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






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






20. Psi - newtons - pascals






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






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






23. Force without machine/Force with machine






24. 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






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






26. 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






27. What we are not studying






28. The magnitude of something in a particular direction






29. The branch of science and engineering involving measurement






30. Force/Area






31. 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)






32. Brake pedal and linkage - Master Cylinder - Wheel cylinders (4) - Hydraulic lines - Hydraulic fluid - Mechanical advantage is provided by the foot pedal to the booster (level) - A greater force is applied on the wheel cylinders than on the brake peda






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






34. 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






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






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






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






38. Length x Width






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






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






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






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






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






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






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






46. 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






47. 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






48. Rotation may occur






49. Length / Time






50. Combustion of fuel mixture ignited by spark plug