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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. Force/Area






2. What we are studying






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






4. What we are not studying






5. When fluid is at rest






6. Force x Distance






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






8. 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)






9. Psi - newtons - pascals






10. Piston travels up and both plugs are closed






11. When the fluid is in motion






12. (pi) x (radius)^2






13. A small piece that makes up a larger whole. Each component is there for a specific job - but the sum of components






14. Body in motion (car)






15. One that pushes on an object






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






17. Applied at an angle or parallel to a surface






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






19. Length x Width x Height






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






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






22. (Force)(Distance)/Seconds






23. Force without machine/Force with machine






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






25. 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






26. Rotation will not occur - but translation might occur






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






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






29. Every object continues in motion in a straight line unless acted upon by some force -Every object at rest continues at rest unless acted upon by a force -So forces cause a change in an object's state of motion

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30. A pull on an object






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






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






33. 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 (






34. Air is drawn in






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






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






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






38. 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.






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






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






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






42. Mass can neither by created nor destroyed - only transformed






43. The perpendicular distance from the pivot point to the point of application of the force (d) - M=Fd -Clockwise=Negative moment -Counterclockwise=Positive moment






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






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






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






47. A combination of components






48. 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






49. Work/force or vertical distance/sloping distance






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