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






2. What we are studying






3. Length x Width






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






5. 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






6. The magnitude of something in a particular direction






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






8. Force/Area






9. Exhaust of combustion products






10. When the moving fluid is a gas






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






12. 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)






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






14. Dimensions and units






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






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






17. Describes how applied forces bring a body into motion






18. 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






19. Intake of fuel and air mix






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






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






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






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






24. 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






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






26. 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






27. Can be applied at a time on an object






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






29. Psi - newtons - pascals






30. Compression-Tension-Shear






31. Work/force or vertical distance/sloping distance






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

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






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






35. 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.






36. Exhaust






37. 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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38. 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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39. ...






40. When fluid is at rest






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






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






43. 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 (






44. What we are not studying






45. An indication of kinetic energy of mass at the molecular level






46. Describes how applied forces bring a body into rest or equilibrium






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






48. 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






49. Force without machine/Force with machine






50. Often a free body has _______ acting on it







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