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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. Mass x acceleration






2. (pi) x (radius)^2






3. Two stroke- Four Stroke- Diesel-Rotary -Hybrid






4. The branch of science and engineering involving measurement






5. 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






6. Dimensions and units






7. 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






8. 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






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






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






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






12. 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 (






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






14. 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






15. Ignition - power stroke






16. When the moving fluid is a gas






17. 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.






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






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






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






21. What we are studying






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






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






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

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25. What we are not studying






26. The magnitude of something in a particular direction






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






28. Describes how applied forces bring a body into motion






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






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






31. ...






32. When fluid is at rest






33. 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






34. 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






35. Combustion of fuel mixture ignited by spark plug






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






37. 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






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






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






40. Compression of fuel mix






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






42. A device that uses energy to do work to accomplish some desired activity - They do not produce energy - but they do transmit and transform energy - Machines can transmit a force - control its motion - and change its direction - a system of components






43. Rotation may occur






44. Friction changes KE to heat energy- Heat is transferred to air- Front brakes work harder than rear- Some brakes use asbestos- Newer cars have dual braking systems - Don't drive through water or your brakes won't work well (ride breaks to dry them out






45. Liquid or gas






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






47. Rotation will not occur - but translation might occur






48. Work/force or vertical distance/sloping distance






49. Derived from - or composed of - base dimensions i.e. Area (length x width) - Weight (mass x acceleration) - velocity (length/time)






50. Length x Width