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






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






3. 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






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






5. 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






6. 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






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






8. When the fluid is in motion






9. Describes how applied forces bring a body into motion






10. Can be applied at a time on an object






11. 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






12. One that pushes on an object






13. Work/force or vertical distance/sloping distance






14. Piston travels up and both plugs are closed






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






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






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






18. (pi) x (radius)^2






19. Combustion ignited by spark plug and materials are compressed






20. Rotation will not occur - but translation might occur






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






22. Exhaust of combustion products






23. Result of a force moving an object against a resistance through some distance in a desired direction -Work transfers energy -Work is a measure of what is done and not the effort applied - Done by lifting - pushing - rotating - or sliding -W=Fd -F=Amo






24. 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






25. When a simple machine increases a force it is at the expense of a ____ in the distance the load is moved






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. Length x Width x Height






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






29. The magnitude of something in a particular direction






30. Force without machine/Force with machine






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






32. When fluid is at rest






33. 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






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






35. Often a free body has _______ acting on it






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






37. Weight/Time






38. Exhaust






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






40. 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.






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






42. Ignition - power stroke






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






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






45. Psi - newtons - pascals






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






47. Intake of fuel and air mix






48. 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






49. Liquid or gas






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