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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. 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






2. 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


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






4. Intake of fuel and air mix






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






6. When the fluid is in motion






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






8. 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






9. 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






10. 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






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






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






13. Compression-Tension-Shear






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






15. When fluid is at rest






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






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






18. Air is drawn in






19. Liquid or gas






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






21. 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


22. Describes how applied forces bring a body into motion






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






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






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






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






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






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






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






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






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






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






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






34. Body in motion (car)






35. 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)






36. A pull on an object






37. One that pushes on an object






38. Ignition - power stroke






39. For every action there is an equal and opposite reaction -Force -F=mg -Earth exerts a force on all of us


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


41. 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






42. The branch of science and engineering involving measurement






43. Psi - newtons - pascals






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






45. Work/force or vertical distance/sloping distance






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






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






49. Exhaust






50. A movement around a central pivot point (rotational movement) -Units: revolutions per second (rps) and revolutions per minute (rpm)