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






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

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3. 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






4. Length x Width x Height






5. (pi) x (radius)^2






6. Exhaust of combustion products






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






8. When fluid is at rest






9. Describes how applied forces bring a body into motion






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. 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






12. 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 (






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






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






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






16. 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






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






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






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






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






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






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






23. Rotation will not occur - but translation might occur






24. 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)






25. 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






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






27. What we are studying






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






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






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






31. (Force)(Distance)/Seconds






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






33. Static - Dynamic






34. 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






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






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






37. One that pushes on an object






38. 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.






39. Rotation may occur






40. 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






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






42. Compression of fuel mix






43. Piston travels up and both plugs are closed






44. 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






45. 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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46. When the moving fluid is a gas






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






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






49. Ignition - power stroke






50. Air is drawn in







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Can you answer 50 questions in 15 minutes?


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