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






2. (pi) x (radius)^2






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






4. 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






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






6. Often a free body has _______ acting on it






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






8. Force/Area






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






10. One that pushes on an object






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






12. Psi - newtons - pascals






13. Ignition - power stroke






14. Weight/Time






15. The branch of science and engineering involving measurement






16. Static - Dynamic






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






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






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






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






21. 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






22. Intake of fuel and air mix






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






24. When fluid is at rest






25. ...






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






27. A pull on an object






28. Air is drawn in






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






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






31. Force x Distance






32. Dimensions and units






33. 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.






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






35. 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






36. 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






37. Describes how applied forces bring a body into motion






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






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






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






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






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






43. 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)






44. 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






45. 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






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






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






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






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






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