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






2. The branch of science and engineering involving measurement






3. A pull on an object






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






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






6. Intake of fuel and air mix






7. Allows comparison between different measuring systems and units - Necessary to market internationally






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






10. Psi - newtons - pascals






11. Mass x acceleration






12. 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






13. 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






14. 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






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






16. 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






17. 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






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






19. Three- dimensional property measured in units of length times length times length =length x width x height






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






21. Compression of fuel mix






22. Exhaust






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






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






25. Body in motion (car)






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






27. ...






28. Can be applied at a time on an object






29. 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






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






31. Energy may enter or leave. Mass can enter or leave the system i.e. open water bottle - molecule - hydraulic cylinder - human






32. Exhaust of combustion products






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






34. Length x Width






35. 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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36. Piston travels up and both plugs are closed






37. Rotation may occur






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






39. (Force)(Distance)/Seconds






40. Force x Distance






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






42. Weight/Time






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






44. When the moving fluid is a gas






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






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






47. 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.






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






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






50. Often a free body has _______ acting on it