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






2. Can be applied at a time on an object






3. Force without machine/Force with machine






4. What we are not studying






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






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






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






8. The magnitude of something in a particular direction






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






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






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






12. Weight/Time






13. Length / Time






14. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us

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15. Combustion of fuel mixture ignited by spark plug






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






17. (pi) x (radius)^2






18. Air is drawn in






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






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






21. 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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22. 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)






23. 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






24. Piston travels up and both plugs are closed






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






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






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






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






29. Force x Distance






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






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






32. Applied at an angle or parallel to a surface






33. Length x Width






34. When the fluid is in motion






35. 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






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






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






38. When the moving fluid is a gas






39. 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






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






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






42. A combination of components






43. Exhaust






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






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






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






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






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






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






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