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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. Can be applied at a time on an object






2. 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






3. When the moving fluid is a gas






4. 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






5. Ignition - power stroke






6. 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






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






8. Force without machine/Force with machine






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






10. 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

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11. ...






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






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






14. 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






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






16. What we are not studying






17. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






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






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






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






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






22. 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






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






24. Exhaust






25. The force simple machines use to do work on a single load or against a single force






26. Static - Dynamic






27. Body in motion (car)






28. 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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29. Length x Width






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






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






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






33. Length / Time






34. A pull on an object






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






36. Air is drawn in






37. (pi) x (radius)^2






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






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






40. Intake of fuel and air mix






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






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






43. 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






44. 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






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






46. An application of Pascal's Principle (trading distance and force while doing the same amount of work) -Gives a mechanical advantage -The muscles of machines - used to produce very large forces - use a fluid under pressure (gas is low pressure and liq






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






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






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






50. (Force)(Distance)/Seconds