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






2. When fluid is at rest






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






4. (pi) x (radius)^2






5. 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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6. Body at rest or is in equilibrium (wall)






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






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






9. Force without machine/Force with machine






10. 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






11. Varies by location (on earth) - distance (from earth) - and mass (of planet)






12. Liquid or gas






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






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






15. 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






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






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






18. 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






19. Work/force or vertical distance/sloping distance






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






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






22. Incompressible (volume doesnt change) Transmit force evenly - Lubricates - Trap contaminants - Some based on vegetable oils - Biodegradable - Aircraft fluids noncombustible (thins as temperature rises)






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






24. Ignition - power stroke






25. Air is drawn in






26. 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






27. What we are studying






28. Body in motion (car)






29. Rotation may occur






30. The magnitude of something in a particular direction






31. 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






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






33. What we are not studying






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






35. 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






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. When the moving fluid is a gas






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






39. Force x Distance






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

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41. 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






42. A combination of components






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






44. Psi - newtons - pascals






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






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






47. 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






48. 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)






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






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