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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. Body at rest or is in equilibrium (wall)






2. Describes how applied forces bring a body into motion






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






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






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






6. When fluid is at rest






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






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






10. 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






11. 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






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






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






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






15. 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






16. If a force causes rotations -Vector- Machines can have more than one torque-Units: foot- pound and newton - meter - i.e. engines - airplanes - propeller






17. 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.






18. 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)






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






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






21. The branch of science and engineering involving measurement






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






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






24. Body in motion (car)






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






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






27. A pull on an object






28. 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






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






30. A combination of components






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






32. When the moving fluid is a gas






33. Air is compressed - work is done on the system






34. Applied at an angle or parallel to a surface






35. Length x Width






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






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






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






39. Rotation will not occur - but translation might occur






40. Combustion ignited by spark plug and materials are compressed






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






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






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






44. 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






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






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






47. What we are not studying






48. 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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49. 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






50. 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