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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. Exhaust






2. Force/Area






3. ...






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






5. When the moving fluid is a gas






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






7. Rotation will not occur - but translation might occur






8. 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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9. 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






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






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






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






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






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






15. When the sum of all forces and the sum of all moments both equal forces - No movement






16. The force simple machines use to do work on a single load or against a single force






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






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






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






20. A pull on an object






21. The amount of atoms and molecules in something - Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI- kgs and USA: Slugs - lbs






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






23. Can be applied at a time on an object






24. Describes how applied forces bring a body into motion






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






26. Length / Time






27. 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






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






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






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






31. Often a free body has _______ acting on it






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






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






34. Length x Width x Height






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






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






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






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






39. Dimensions and units






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






41. Exhaust of combustion products






42. 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 (






43. What we are not studying






44. Body at rest or is in equilibrium (wall)






45. Static - Dynamic






46. 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






47. 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






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






49. Compression-Tension-Shear






50. 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.