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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. Ignition - power stroke






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






3. Rotation will not occur - but translation might occur






4. ...






5. Compression of fuel mix






6. A combination of components






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






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






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






10. A pull on an object






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






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






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






14. 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






15. (Force)(Distance)/Seconds






16. 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)






17. Dimensions and units






18. 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






19. 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






20. Psi - newtons - pascals






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






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






23. Same pressure - work - volume - Different forces and distances






24. Air is drawn in






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. Force without machine/Force with machine






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






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






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






30. When two parallel forces equal in magnitude and opposite direction - i.e. steering wheel - turn a know - turn on and off a faucet






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






32. The magnitude of something in a particular direction






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






35. Applied at an angle or parallel to a surface






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






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






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






40. When the fluid is in motion






41. Intake of fuel and air mix






42. (pi) x (radius)^2






43. A quantity that has both magnitude and direction when placed within a coordinate system -Forces and Velocity i.e. driving 50 miles to the northeast






44. 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






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






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






47. 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






48. What we are not studying






49. 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






50. Weight/Time