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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. Air is compressed - work is done on the system






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






3. Static - Dynamic






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






5. 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






6. 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






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






8. A pull on an object






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






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






12. Describes a physical property of anything - What we are measuring






13. Force x Distance






14. Exhaust of combustion products






15. Can be applied at a time on an object






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






17. Air is drawn in






18. One that pushes on an object






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






20. Length x Width x Height






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






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






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






24. Length / Time






25. 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.






26. Rotation will not occur - but translation might occur






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






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






30. What we are studying






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






32. Work/force or vertical distance/sloping distance






33. Compression-Tension-Shear






34. Liquid or gas






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






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. Body in motion (car)






38. The magnitude of something in a particular direction






39. 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 (






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






41. Can be applied:-By direct contact: push - pull - twist -At a distance: gravity - magnetism Can change: speed - direction - shape - units of force






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






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






44. (Force)(Distance)/Seconds






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






46. 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






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






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






49. Often a free body has _______ acting on it






50. 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






Can you answer 50 questions in 15 minutes?



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