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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. The magnitude of something in a particular direction






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






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






4. 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






5. Rotation will not occur - but translation might occur






6. 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






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






8. Rotation may occur






9. A^2+b^2=c^2 - used to calculate vectors






10. Air is drawn in






11. ...






12. 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






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






14. 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 (






15. A pull on an object






16. Combustion ignited by spark plug and materials are compressed






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






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






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






20. Force without machine/Force with machine






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






22. (pi) x (radius)^2






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






24. Piston travels up and exhaust valve opens. Combustion by product exhaustion






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






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






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






28. Can be applied at a time on an object






29. Length x Width x Height






30. Compression-Tension-Shear






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






32. 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






33. Length x Width






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






35. A combination of components






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






37. Liquid or gas






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






39. Combustion of fuel mixture ignited by spark plug






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






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






42. 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.






43. Force x Distance






44. 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






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






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






47. 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






48. The branch of science and engineering involving measurement






49. 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






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