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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. 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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2. Rotation may occur






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






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






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

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7. 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






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






9. 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






10. Old technology- harder to service-Still used on big trucks and trailers because they are too expensive to convert






11. 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






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






13. 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






14. Exhaust of combustion products






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






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






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






18. Brake pedal and linkage - Master Cylinder - Wheel cylinders (4) - Hydraulic lines - Hydraulic fluid - Mechanical advantage is provided by the foot pedal to the booster (level) - A greater force is applied on the wheel cylinders than on the brake peda






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






20. Psi - newtons - pascals






21. One that pushes on an object






22. Force x Distance






23. When fluid is at rest






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






25. A pull on an object






26. Static - Dynamic






27. 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






28. Weight/Time






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






30. 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






31. Compression of fuel mix






32. Air is drawn in






33. 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 (






34. A combination of components






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






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






37. ...






38. 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






39. 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






40. When the moving fluid is a gas






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






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






43. 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)






44. Body in motion (car)






45. 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






46. Fuel is injected and combusts due to temperature of compressed air






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






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






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






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