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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. 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






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

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3. 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






4. 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






5. Mass x acceleration






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






7. 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






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






9. What we are not studying






10. The magnitude of something in a particular direction






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






12. When the fluid is in motion






13. One that pushes on an object






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






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






16. Air is drawn in






17. Force/Area






18. Can be applied at a time on an object






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






20. Energy may enter or leave. No mass enters or leaves the system i.e. Closed water bottle - car engine - human






21. Exhaust






22. Liquid or gas






23. A pull on an object






24. ...






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






26. Length / Time






27. Rotation may occur






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






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






30. Describes how applied forces bring a body into motion






31. The branch of science and engineering involving measurement






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






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






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






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






36. When fluid is at rest






37. Combustion of fuel mixture ignited by spark plug






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






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






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

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






42. Weight/Time






43. 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 (






44. Body in motion (car)






45. 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.






46. 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






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






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






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






50. 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)