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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. Describes how applied forces bring a body into motion






2. Causes acceleration -Units: USA: 32.2 ft/s^2 SI: 9.8 m/sec^2






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






4. Combustion of fuel mixture ignited by spark plug






5. Weight/Time






6. A pull on an object






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






8. The magnitude of something in a particular direction






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






10. When the fluid is in motion






11. 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






12. When the moving fluid is a gas






13. Rotation may occur






14. When fluid is at rest






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






16. External Combustion engine -Only used in factories and plants (not used in cars)






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






18. ...






19. 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






20. Force without machine/Force with machine






21. Liquid or gas






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






23. 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.






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






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






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






27. Compression-Tension-Shear






28. 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






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






30. 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






31. Mass x acceleration






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






33. Length x Width






34. Often a free body has _______ acting on it






35. 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






36. Intake of fuel and air mix






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






38. 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






39. 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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40. Can be applied at a time on an object






41. 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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42. Force x Distance






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






44. 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 (






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






46. 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






47. Length x Width x Height






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






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

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