Test your basic knowledge |

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. Weight/Time






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






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






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






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






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






7. Work/force or vertical distance/sloping distance






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






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






10. 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






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






12. A pull on an object






13. Psi - newtons - pascals






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






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






16. Length x Width






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






18. When the fluid is in motion






19. Often a free body has _______ acting on it






20. 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






21. Exhaust






22. Rotation may occur






23. Dimensions and units






24. 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.






25. 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


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






27. Length / Time






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






29. Exhaust of combustion products






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






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






32. 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 (






33. What we are not studying






34. Applied at an angle or parallel to a surface






35. Varies by location (on earth) - distance (from earth) - and mass (of planet)






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






37. A flat - two dimensional property -Units of length multiplied by length describe area -A=length x width






38. A combination of components






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






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






42. Force/Area






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






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


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






46. Force x Distance






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






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


49. 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






50. Describes how applied forces bring a body into motion